Thursday 25 August 2016

hierarchial pattern of indian cities

Hierarchical Patterns of Indian Towns – Explained

The hierarchy may be identified either structurally or within each function.

Structural Hierarchy:

An important aspect of urbanisation all over the world is the uneven pattern of development of small towns and big cities within the system. Every urban system is characterised by the presence of a few large cities and a large number of small towns. The large cities account for a larger share of the total urban population, while the small towns, despite their numbers, account for a smaller share. This is true of the Indian urban system.
The million plus cities form the apex of the Indian urban system and account for over one- third of India’s urban population (see table 19.4). They are followed closely by the one-lakh cities (class I towns) and the medium towns (classes II and III towns), each of which accounts for over a quarter of the urban population.
Population of Million Plus Cities/Towns
Together, these three categories add up to more than 80 per cent of the total urban population. The small towns, which account for 48 per cent of the total number of towns and include classes IV and V towns, constitute only 10.5 per cent of the total urban population. The distribution patterns of the major classes of towns and cities in different states of India show remarkable unevenness.

Functional Hierarchy:

Each major function (as discussed above) has its own hierarchy. For instance, if we take administration, the revenue village is at the lowest level. The level above this is the panchayat union or block and above that tehsil or taluk under a tehaildar. Above this is the district headquarters under a district collector.
Government departments like education, health, irrigation etc. are located in the district headquarters. Above a district headquarters is the state capital which has the governor, the state legislature, the secretariat and the high court. At the top is the national capital New Delhi which has the president, the parliament, the central secretariat and the Supreme Court.
Similarly other activities like trade, health and educational services, manufacturing etc. have their own hierarchy where the lower level functions are located in smaller towns and higher levels in larger towns. Each level requires a threshold population to support that particular function. For instance, a primary health centre is recommended for a population of 30,000 (20,000 for tribal and hilly areas), while an upgraded community centre is recommended for a population of 1,00,000.

Sustainable city


Sustainable city 


Maintain population, particularly economically active people. Develop human resources.
Economic growth.
Infrastructure and urban services.
Quality of life.
Environmental impact. Ecological footprint.
Circular metabolism.
Green design and architecture.


Energy efficiencies. Carbon neutral city. (Masdar)

urban sphere of influence

Urban sphere of influence


SOURCE 1

Urban spheres of influence reflect centre-to-hinterland relationship, compared with the non-central
region, the centre assumes more complex economic functions, and provides more economic activities. Famous theoretical contributions to this research field are the Central Place Theory (Christaller, 1933), the extension to the Central Place Theory (Losch, 1940), the modification to the Central Place Theory (Isard, 1956), and An Economic Theory of Central Places (Eaton et al.,1982). After verification and conceptual refinement of these classical literatures, it can be found that any study on delineating sphere of urban influence has been guided by either of two research approaches: the empirical research and model research.

Empirical method determines sphere of urban influence according to data features and regional characteristics. As for example, sphere of urban influence in America is described in terms of the extent of the regional delivery system (Huff, 1973). Models are developed to capture the interaction between or spaces using theoretical understanding, the intensity and pattern of contact among cities, and thus those models help to determine the sphere of urban influence.

In modeling, the sphere of urban influence, Huff (1973) and Lutz (1995) made a great contribution by using a model namely “Sphere of Urban Influence and Urban System” to delineate the urban sphere of influence of United States of America, Ireland and Ghana. Now-a-days in Western countries, the study of sphere urban of influence is diminishing in general. By virtue of their high degree of economic and social development, most of the developed countries have accessed post-industrial society, where node-to-node interactions have become, as compared to the node-to-hinterland relationships. But, for the developing countries, they are still pursuing industrial development and hence, develop the industries; the node-to-hinterland relationships are distinctly dominant. Recently the studies of spheres urban of influence of industrial cities are assuming international academic interest (Wang et al., 2001 & Liang, 2008). The present study is a humble attempt to analyze the socio-economic facilities by total population and composite functional score, and to delineate the sphere of urban influence.


source 2

Urban Spheres of Influence on Population

The urban sphere of influence can be defined as the geographical region which surrounds a city and maintains inflow-outflow relationship with the city.

Every urban centre, irrespective of the size of population and the nature of function, has a region of influence. Generally speaking, as the size of the population increases, the multiplicity of functions increases. As a result, the influence zone is larger and vice versa.
The term sphere of influence area was first used by Northam and supported by Canter. Other terms to express a similar entity, which have got recognised, include umland and city region. Umland is a German word which means the area around. The term was first used by the Allies in the Second World War.
The term city-region was first used by Dickinson. It is used to describe a similar situation on a much larger scale. Some other terms which have become popular include urban field, tributary area and catchment area. The term sphere of influence is preferred by political geographers.

Delineating the Sphere of Influence Area:

Several methods have been worked out by geographers and sociologists, but no single method seems to be perfect.
The pre-First World War geographers depended primarily on empirical methods (through questionnaires and field surveys) taking into account all those relevant functions which are performed by cities and the surroundings of the city. The influence zone of each function is first delineated. It brings out the multiplicity of boundaries of spheres of influence area.
Harris has suggested that a common boundary is to be drawn from within those boundaries which are very close to each other. Harris himself drew a sphere of influence area for the Salt Lake City of Utah State in USA. He used 12 important services for this purpose which included retail trade, wholesale grocery and drug sale, radio broadcasting, newspaper circulation, telephone services, banking distribution etc.
Harris scheme shows greater dependence upon the services of the cities. He practically ignored the services rendered by rural areas. Geographers like Carter, Dickinson and Green studied the sphere of influence area and their empirical methods gave due weightage to the rural services.
The post-Second World War geographers began to use statistical methods. This made the inferences more precise, logical and scientific. This method, however, has the disadvantage of being rigid. Still, it is a popular method throughout the world.
The conclusion of the method brings the delineated influence area closer to Christaller’s observations, who suggested that every urbane settlement (service centre) is supposed to have a hexagonal influence region. It solves the problem of existence of shadow zone which normally appears in the case of spherical delineation of the influence region.
The statistical method is based on the principle of gravitation. Reilly propounded the Law of Retail Gravitation to delineate the market zone of urban centres. Since marketing is a principal function, this method is used by geographers to delineate the zone of influence area.
This method states that:
P= Mx MB / d2
where MA = Mass of centre A measured by population size, such that MA > MB
MB = Mass of centre B
d = distance between two cities.
The result will mark the distance of the sphere of influence area from Mass (city) A; the remaining distance will mark the influence area of Mass (city) B. Modern urban geographers give importance to this method as they consider this cut-off as an important factor for development of respective influence areas.
Some development authorities have begun to use the sphere of influence area as the basis of regional planning. They use detailed questionnaires to understand the nature of influence. They consider factors such as daily commuting, functional structure of village, household types of villages, milk supply, vegetable supply, newspaper circulation etc. This approach seems to have some practical utility.
It gives due weightage to natural hindrances. Factors like rivers, mountains, forests, marshy lands etc. are bound to modify the influence area and in that case, the statistical method is not of much relevance. Information collected through questionnaires is, however, properly processed through different statistical methods and a composite index, indicating a common boundary, is worked out. This common boundary gives the limit of the sphere of influence area.
Thus, it becomes clear that the sphere of influence area is highly relevant in socio-economic patterns of a city and its surroundings. In India, the regional planners have given due recognition to the role of city regions or spheres of influence areas in the ‘Growth Pole’ strategy adopted by the Planning Commission of India in the Sixth Five- Year-Plan.
SOURCE 3
Sphere of influence
“The sphere of influence is the area surrounding a settlement that is affected by the settlement's activities.”
The sphere of influence of a shop is how far people will be prepared to go to make use of that shop. For example if people decide to travel a long distances for a shop that shop will have a big sphere of influence. But if a people didn’t feel it was necessary to travel long distances to go there shop has a small sphere of influence


*What is a settlement hierarchy?
A settlement hierarchy is the arrangement of settlements in an order of importance.


*
*What is the settlement hierarchy based upon?

The order of settlements within the settlement hierarchy is usually based 
on one of the following:

 the size of the settlement in terms of its area and population

Is it easy to organise a hierarchy by population size?
NO!
The population figures for each type of settlement are really just a guide, as it is difficult to give a cut-off figure for when a hamlet becomes a village, or a village becomes a town.
In some countries, so-called villages can be very big.  For example, some villages in India may be as large as a British town. 
BUT it is true that the largerthe settlement, the fewer of them there are – look again at the pyramid! There are many isolated buildings but very few conurbations.

* the range and number of services/functions within each settlement
The number of shops and services in a settlement depends upon the threshold population, which is the minimumnumber of people required by a shop/service to make a profit. Shops and services are classified according to their threshold population:


* the relative sphere of influence of each settlement
Sphere of influence is the area served by a particular settlement. 
Range is the maximum distance that a customer is prepared to travel.

*
*

Tuesday 23 August 2016

URBANISATION AND INDIA

URBANISATION AND INDIA

Urban definition in indian terms?CLasification
Criticism of Criteria for towns And possible solution ie reasonable criteria?
Terms like megacities, metrocities, Conurbation,Megapolis,Cosmopolitan?
Classify cities based on sizes?

Wednesday 17 August 2016

humanism

Humanistic geography. The approach of the humanistic geographer is to give
center stage to human awareness, human inventiveness, and individual percep-
tion of place. Humanistic geography is somewhat connected with early French
human geography, but it has a closer tie with contemporary social geography.
Humanistic geography emerged in the 1970s as a reaction against the mech-
anistic approaches of the Quantitative Revolution. A key question asked by
humanistic geographers is “why do people act as they do?” Implicit in this ques-
tion is a searching for attitudes, perceptions, and awareness in humans that
help to explain how they behave, individually and collectively, in the spatial
context. An important reversal of emphasis occurred in humanistic geography
from the notion of the “spatial confinement of people and societies” to “ones
concerned with the human and social construction of space”
Yi-Fu Tuan, an early advocate of humanistic geography, suggested that
achieving a more thorough understanding of humans was the main goal of the
discipline. Tuan also compared the scientific approach to the study of humans,
which paid little attention to the role of human awareness, and the approach of
the humanistic geographer, which emphasizes human awareness and links it to
spatial activities. Tuan, originally from China, was a longtime geography pro-
fessor at the University of Minnesota and is now retired.
Humanistic geographical approaches were radically different from that of
the accepted geographies of the 1970s. Physical geographers especially were
critical of the new forms of explanation offered by humanistic geographers. In
the new approach, empirically based hypotheses supported by analysis and ob-
jectivity were replaced by subjective conclusions and methodologies that were
seen as intellectually suspect.
Humanistic geographers address the role of evaluating human awareness of
the environment and consequent activities within it. Most important, humanistic geography emphasizes the importance of the subjective view and the mer-
its of the individual human being existing within spatial bounds.



HUMANISTIC GEOGRAPHY
Humanism is a term that encompasses a variety
of philosophical positions that go back to the
Renaissance, when scholars such as Erasmus and
Petrarch offered views of the social world that put
people in the center, in contrast to the prevailing
religious interpretations. Closely associated with
humanism is hermeneutics (from Hermes, the Greek
messenger of the gods), which is essentially the study
of meanings. Originating from medieval attempts to
find the one “true” meaning of the Bible, hermeneutics
became extended to include the multiplicity of
meanings inherent within all literary texts and social
actions.
Two closely related approaches to humanistic
thought have characterized it over time: phenomenology
and existentialism. Both are concerned with the shape
of human experience—the nature of subjectivity—and
there is considerable overlap. Whereas phenomenology
tends to emphasize the nature of human experience
and meaning, existentialism is more often
concerned with the ethical conduct of life.
Several giants in the history of philosophy invoked
these lines of thought. Danish Christian existentialist
Søren Kierkegaard (1813–1855) offered a Romantic
critique of the Enlightenment, claiming that objectivity
is a myth and that all people faced an agonizing choice
between faith and reason, between the sacred and the
profane, between ethics and pleasure. Edmund Husserl
(1859–1939) formed a transcendental phenomenology,
noting that the view of science as an objective map of
the outer world reduced the human observer to a passive
receptor. He argued that objects do not have meanings
in and of themselves; rather, meanings are
constructed by the human mind. Husserl called for a
science of phenomenology that would strip away the
biases that the mind creates in its perceptions of the
world in order to see essences—the reality of things in
themselves. Martin Heidegger (1889–1976) asked the apparently simple question, “What does it mean to be?”
and offered a very complex answer. His view rested on
the notion of the hermeneutics of being (Dasein), the
understanding of which meant an escape from abstract
theorizing. Jean-Paul Sartre (1905–1980) attempted a
merger of existentialism and Marxism, noting that in
contemporary capitalism the human condition is depersonalized
and alienated.
Essentially, all of these views maintain that objectivity
is a hurdle to effective understanding and that
there is no privileged conceptual vantage point; every
view is a view from somewhere and is inescapably
laden with biases. We cannot know the world except
for the meanings that people give to it. Thus, human
subjectivity is not a barrier to understanding the world
but rather the only route to knowing it. Meanings are
essentially arbitrary phenomena, and logic cannot
inform our moral choices. Despite this predicament,
as Sartre noted, humans are “condemned to freedom”;
that is, they must make choices even if there are no
firm grounds for doing so.
Thus, the project of a humanistic social science
was to put people back in the center of social analysis,
that is, to reveal the things that make people human
(i.e., consciousness). Social science has long had a
poor conception of the human subject—a flaw that
humanism attempts to overcome. It is consciousness
that makes us subjects rather than objects, that is,
allows us to be actors in the world with will and volition.
Mapping human consciousness allows us to
move past the sterile models of human behavior such
as Homo economicus to recover the sensuous nature
of experience—the ways in which the self, the environment,
and others are framed symbolically. This
task involves some understanding of intentionality—
our deeply human desires and motivations, anticipations
and expectations.
Uncovering the multiple dimensions of human consciousness,
however, is no simple task. It is essential
to avoid simplistic and biologically reductionist notions
of “human nature.” In the broadest sense, consciousness
is what makes us human. In some respects, human
consciousness differs qualitatively from animal consciousness
(e.g., in humans’ sense of self, time, humor,
and death), although with many primates this difference
is a matter of degree. Constructing a humanistic understanding
of consciousness has also invoked various
psychological understandings of sensation, perception,
and cognition, leading to intersections with behavioral
approaches. Consciousness includes our emotions and
memories, pleasures and fears, sexuality, hopes for the
future, and more—both rational and irrational. This
view sees humans as active creative actors and stresses
their constructive role in making the world. Social reality
does not simply happen to individuals “behind their
backs” or “above their heads”; individuals make the
world that makes them. Thus, humanistic social science
is unapologetically anthropocentric, antinaturalist (it
objects to using the same means to understand the natural
world and the social world), and antideterminist,
noting that people’s actions render social structures
ever changing and contingent.
Humanistic thought emphasizes the central role of
language as a set of signs that we use to negotiate the
world and share meanings. Language is how we bring
the world into consciousness, and thought is always
linguistically structured. As linguists and philosophers
such as Wittgenstein have demonstrated, language is
an opaque medium of understanding with a structure
of its own. There is no language-free theory, and language
limits and constrains the ways in which meanings
are constructed, at times letting them escape their
authors. The intersections of humanistic thought and
literature in the form of textual deconstruction
allowed every system of signs (e.g., a text, a landscape)
to be pulled apart.
Like positivism and empiricism, the humanistic
approach begins with the individual and experience in
the construction of knowledge. The task of social
science is to enter into another’s taken-for-granted
world, to see reality through the other’s eyes, and to
acknowledge the other’s view as a valid source. Truth
is found in the subjective meanings that people assign
to their worlds, and explanation is the recovery of
their intentions. Thus, humanism advocated a selfconsciously
empathetic social science that did not
strive for the holy grail of objectivity but rather confronted
its own inevitable assumptions and biases.
This approach forces researchers to acknowledge both
the subjectivity of the observer and the subjectivity of
the observed—to question their own assumptions and
biases—rendering the old subject/object dichotomy
false and inserting the researcher into the research
process. In so doing, humanism confronted social
science with the need to clarify the ethics and morals
of the observer, making clear his or her positionality
in the research process. It also legitimated the use of
qualitative research methods, such as participant
observation and case studies, that sought to uncover
the views of subjects Humanistic thought has a long history in the discipline
of geography. During the early 20th century,
French cultural geography owed much to Paul Vidal
de la Blache, who studied the unity of culture and
landscape in terms of the lifestyles (genres de vie) in
small rural areas called pays, uniting land and life
through an understanding of how consciousness and
the earth are deeply intertwined. During the 1960s and
1970s, several authors made major contributions to
the American literature on humanistic geography.
Edward Relph’s Place and Placelessness was concerned
with the cultural impacts of mass production
and consumption, the homogenization of capitalist
landscapes, and resulting alienation. Ann Buttimer
introduced the notion of lifeworlds, a phenomenological
recovery of genres de vie that took as its point of
departure the multiple ways in which consciousness
was preconsciously sutured to locales in the intimate
rhythms of everyday life. David Lowenthal wrote on
landscape tastes and perceptions and on the relationship
between history and cultural heritage. David Ley
offered richly detailed urban ethnographies of the
inner city and social geographies of Canadian cities.
Yi-Fu Tuan, who coined the term humanistic geography,
held pride of place in this pantheon. Tuan’s
contributions included the widely popular notion of
“sense of place”, that is, the highly subjective set of
feelings and impressions that individuals attach to
specific locales. In this reading, places are intangible
webs of meaning, not simply physical points. Sense of
place, for example, makes a house into a home, makes
a church into a building with deeply religious meanings,
or defines a gang’s turf. Tuan applied this set of
notions, broadly grouped under the label topophilia,
to studies of nature versus wilderness, spaces of pain
and torture, sacred places, patriotism, pets, and more.
This line of thought also differentiated between
space and place. In part, the difference is a matter of
scale; space generally concerns broader domains than
the individual experiences on a daily basis. However,
space in the Western tradition often is used in a highly
abstract sense such as a Cartesian plane or isotropic
plains used in mathematical models. In contrast, place
tends to be smaller, localized, more intimately experienced,
intangible depositories of experience. The shift
from space to place—one of the major contributions
of humanistic geography—saw a transition from the
abstract disembodied space to the embodied, erotic, personal,
pungent places of individual worlds. Such a move
exhibited a concern with particularity and specificity
rather than with generality and made little effort to
search for “general laws.” Humanistic geographers
were interested in what makes places unique, how
they enter human consciousness, and how that consciousness
in turn constructs places through interpretation.
In so doing, they opened to geography linkages
to hitherto closed domains such as landscape architecture,
cultural anthropology, the sociology of the self,
and the arts and humanities.
Another topic legitimized through humanistic
geography was the geography of identity and the
body. Whereas classical theories of the human subject
portrayed identities as unitary and stable, phenomenologists
argued that identity is a multiplicity of
unstable, context-dependent traits—sometimes contradictory—
that change over time and space. Identities
are both space forming and space formed, that is, inextricably
intertwined with geographies in complex
and contingent ways. Likewise, human geographers
explored the multiple ways in which identity, subjectivity,
the body, and place are sutured together. The
interface between body and mind is an ancient topic
of philosophical consideration; the fact that we both
have bodies and are bodies confronts us with the nebulous
intersections of mind and matter. The body is
where the mind resides, the locus of consciousness,
tangible and corporeal evidence of its existence,
giving existential and phenomenological depth to
lived experience. Although bodies typically appear as
“natural,” they are in fact social constructions deeply
inscribed with multiple meanings—“embodiments”
of class, gender, ethnic, and other relations. The body
is the primary vehicle through which prevailing economic
and political institutions inscribe the self, producing
a bundle of signs that encodes, reproduces, and
contests hegemonic notions of identity, order and discipline,
morality and ethics, sensuality and sexuality.
In insisting on the primacy of the intentional subject,
humanistic scholars were adamant that geographies and
landscapes always are authored, that is, created by
people who give meaning to them. This position was
very much at odds with rival perspectives, including the
impersonal geometries of positivism. Humanists challenged
behavioral geographers to explore not only the
actions of people but also their intentions, avoiding
simplistic black-box models such as Homo economicus.
Finally, humanist thought mounted a serious challenge
to Marxism, pointing out its flawed conception of
human subjectivity and questioning its economic determinism
and teleological view of history and geography, where people are represented as finders of a world
already made. Instead, humanists argued that the social
world was open-ended and contingent, forever in the
process of becoming.
Humanistic thought, however, also had its critics.
Marxists and others pointed out that it offered no
account of social relations—of class, power, and production.
Moreover, humanism’s notion of the subject,
however rich, was a largely asocial undersocialized
account of individuals in purely personal—not interpersonal—
terms. For example, a dwelling is not just a site
of caring and memories but also a locus of social reproduction,
family relations, patriarchy, and power.
Moreover, by being silent about social relations, humanistic
thought lapsed into an uncritical view of the world
as simply structured by choice, a mythologized vision of
“free will” devoid of social constraints. Methodologically,
humanism’s critics argued that the approach
was deeply flawed; for example, it offered no means of
validating, confirming, or disproving its claims. Some
even held that humanistic thought was opposed to
science. These problems led Entrikin to conclude that humanism sufficed as a critique of other positions, a way
of unmasking presuppositions, but not as an alternative.
Humanistic thought made great contributions to the
discipline, helping to revive cultural geography and
forcing researchers to take seriously the complex question
of human consciousness. It jettisoned the myth of
objective research and made explicit discussion of values
and biases an integral part of the process. In the
end, humanistic geography, faced with serious critiques
of its own, was largely integrated into other paradigms
such as structuration theory and various poststructuralist
perspectives that arose during the 1980s and 1990s.


Tuesday 16 August 2016

Dualism

Dualism

In his critical investigation of geography as a single, unified field of science, Kraft finds that, while one could dismiss the charge of dualism of content--natural and human features--as invalid, the inclusion of the systematic and the regional points of view was an unquestionable form of dualism. He agrees with Hettner, however, that this dualism cannot be expressed simply as the combination of a nomothetic and an idiographic science; systematic geography must include the study of unique cases, and regional geography must use generic concepts and principles. In any case, neither construction of laws nor the description of the unique represents the purpose of geography, or of any other science. The purpose of geography is the same in both branches, the comprehension of the areal differentiation of the earth, and this purpose cannot be solved either by systematic studies alone nor by regional studies alone, but requires both approaches. Consequently, he concludes, this dualism in approach is justified as necessary for the single aim which makes geography a unified science

This view, we may add, is further supported by the fact, stressed by Hettner, that it is frequently difficult to classify particular studies under one heading or the other. The difference is not in the substance, but in the point of view, and in certain kinds of studies these may be combined. For example, the systems of land-use classification previously discussed (Sec. X F, G) are intended to provide backgrounds for agricultural regional geography and they involve, in outline, a major part of the regional study of any area. At the same time, however, they represent systematic studies of particular element-complexes in their world distribution, so that it is by no means clear whether they belong more in the one or the other of our two major divisions.


Finally, if one agrees that both regional and systematic studies are included as essential parts of geography, we may perhaps dismiss any question of relative importance as irrelevant. For systematic geography, regional studies provide, not merely a source of detailed factual information that otherwise would hardly be available, but they also indicate problems of relationships that might easily be overlooked in systematic geography, and they provide the final testing ground for the generic concepts and principles of systematic geography. On the other hand, it is even more obvious that progress in interpretation of the interrelated phenomena of regional geography is constantly dependent on the development of such universals by systematic studies. Any assumption that these studies can be left to the systematic sciences concerned with each particular category of phenomena has been shown by experience to be unwarranted. The aspects of these phenomena with which geography is concerned--their relation to other earth phenomena in different parts of the world--are not of direct concern to those systematic sciences and are more commonly left unstudied, unless geographers study them, as Lehmann has shown. Systematic geography, he therefore concludes, is not to be thought of as a border area of geography, or merely as a propaedeutic, but represents "organs vital to the growth of geography, without which its regional crowning can as little exist as a real tree without its roots" 

Areal differentiation



Humboldt and Ritter often
are argued to be the founders of the regional approach
and scientific geography; however, they differed on
several fronts. First, Humboldt was secular, whereas
Ritter was religious. Second, Humboldt focused on
the physical environment, whereas Ritter focused on
human geographies. Third, Humboldt worked at a
fine level of areal differentiation, whereas Ritter
worked at the scale of continents.

CHOROLOGY
In the wake of the collapse of environmental determinism,
the discipline embraced a long-standing tradition
of chorology, also known as areal differentiation. In
Europe, a central figure in this vein was Paul Vidal de
la Blache (1845–1918), considered the father of
French geography and well known for his studies of
small rural areas called pays and their associated styles
of life (or genres de vies). He also played a central role
in the introduction of possibilism to the discipline. His
German counterpart was Alfred Hettner (1859–1941),
who argued in the Kantian tradition that geography
consisted of the art of regional synthesis, seeking relations
among phenomena that other disciplines ignored.
In the United States, the most famous advocate of
chorology was Richard Hartshorne (1899–1992), who
studied under Hettner and then graduated from the
University of Chicago in 1924. Chorologists maintained
that the essence of the discipline was the
description of regions in all of their glorious uniqueness
and complexity, including cultural and physical
phenomena. Hartshorne argued that the most productive
analyses focused on small, relatively homogeneous
regions, noting that any deployment of the regional
concept was inherently a subjective tool to find meaning
in the unwieldy complex of data found in the
world. Thus, regions were mental tools to impose
order on chaos. By eschewing theory, chorology
found itself mired in empiricism and the discipline’s
theoretical and philosophical progress was halted.

Chorology drew to a close during the 1950s,
beginning with a famous attack on Hartshorne’s
worldview by Frederick Schaefer in 1953. Essentially,
Schaefer claimed that the view that geography is an
integrative science concerned with the unique was
naive and arrogant because such issues were common
to many sciences. By refusing to search for explanatory
laws, geography condemned itself to what
Schaefer called an immature science. Rather than
seeking idiographic regions, geographers should seek
nomothetic regularities across regions. This critique
helped open the door to the rise of positivism and the
quantitative revolution.


IDIOGRAPHIC
The term idiographic refers to the unique aspects of
individual areas, that is, those that cannot be understood
easily on the basis of general rules of inference
or deduction. Much of geography traditionally has
been concerned with the idiographic in the context of
regions and places, long mapping the colorful and
extraordinary. However, the uniqueness of places has
also been at the center of significant philosophical
debates about how to study geography.
The tradition of chorology or areal differentiation,
which predominated during the early 20th century and
was epitomized by Richard Hartshorne, maintained
that geography is an integrative science that is concerned
exclusively with the unique. In this perspective,
regions form the highest form of understanding.
Idiographic understanding holds that each region is a
Idiographic
unique combination of physical and human elements
in the landscape. Smaller regions are more likely to be
more internally homogeneous, and broader ones can
be understood through the accretion of small units.
Upholding the idiographic in this manner essentially
disregards the need for general themes or causal properties
that transcend regions, the key point of nomothetic
(law-seeking) approaches to geography. Thus,
the idiographic has long been associated with empiricist
and inductive forms of thought in geography, that
is, generalization without explanation


AREAL DIFFERENTIATION
The American version of regional geography reached
its apex between the two world wars with the ascent
of the school variously labeled as areal differentiation,
chorology, or regional description. The ascent of
this line of thought was to be found in the aftermath
of environmental determinism, when the discipline’s
retreat from theory sharply differentiated it from other
social sciences that were making great strides. Its
embodiment is Richard Hartshorne (1899–1992) and
his definitive landmark text, The Nature of Geography
(published in 1939). Having studied under Hettner
and thus heavily Kantian in outlook, Hartshorne made
Regional Geography———405
a variety of claims regarding regional geography as
the definition of the discipline’s core and claim to
uniqueness within the academic division of labor.
Geography, like history, was synthetic, integrating the
analysis of different phenomena as they were manifested
in unique combinations in particular places.
Regions allowed the analysis of both human and
physical phenomena, transcending the growing schism
between two parts of the discipline. Because the complexity
of the world is overwhelming, Hartshorne advocated
the study of small regions with relatively little
internal variation, accreting this into a mosaic that
would encompass larger areas. This view subscribed
to a crude spatial determinism in which proximity came
to stand for causality; where things were enough to
ascertain their nature, and closer phenomena were more
likely to be related than more distant ones. He well
understood that regions are only tools and, in the vein
of Kant, maintained that regions are only mental constructs,
that is, simplifications of the world that the
mind uses to impose order on the world.
Hartshorne essentially regarded regions as static
and held little regard for the need to engage in the
study of explanatory processes; that is, regional
geography was to be only about appearances. This
approach represented a spatialized version of the philosophy
of empiricism (with its roots in the British
Enlightenment), that is, the assumption that facts and
data are true or false without appeal to theory. In contrast,
more recent approaches argue that all data are
theory laden; that is, it is theory that informs us what
facts are relevant to an issue at hand. There are no
pure facts, given that observations always are couched
in terms of a theory; observation requires interpretation,
which in turn requires theory. Hartshornian
chorology was the essence of inductive empiricism,
and its Achilles’ heel was the inability to engage in
abstraction.
American regional empiricism suffered a devastating
set of setbacks during the 1950s as it was pushed
aside by an increasingly assertive school of positivists.
A famous article by Frederick Schaefer published
in 1953 charged that Hartshorne’s claim that
geography alone studied the unique was naive, arrogant,
and immature. All sciences face the problem of
uniqueness, and explanation (as opposed to regional
description) consisted of embedding the unique within
a wider understanding of laws and causal processes.
Schaefer opened the door to a heated debate about
whether geography should be concerned primarily
with the nomothetic (i.e., law seeking) or be content
with the idiographic (i.e., the unique). The rise of positivism
saw the triumph of the nomothetic approach
and the discipline shift from the study of all aspects of
one place to the study of one aspect of many places, a
move that entailed a reorientation from the concrete to
the abstract, from induction to deduction, from a concern
with the specific to a pursuit of the universal.
Ultimately, the demise of chorology saw the discipline
change from a concern with regions without explanatory
laws to one obsessed with laws devoid of regions.
Some observers, such as John Hart, maintained that
regional geography nonetheless played an important
role in minimizing armchair theorizing and in popularizing
the discipline at large.

ISOSTASY

Isostasy (Greek ísos "equal", stásis "standstill") is the state of gravitational equilibrium between Earth's crust and mantle such that the crust "floats" at an elevation that depends on its thickness and density. This concept is invoked to explain how different topographic heights can exist at Earth's surface.


Isostasy
If you were to take a large rubber ball and place something heavy on top of it, such as a bowling ball, what do you suppose would happen to the rubber ball?
The weight of the bowling ball will push the skin of the rubber ball inward, creating a dent. Scientists observe the same phenomena with the Earth’s crust. When the Earth’s crust is pushed down, creating a small dent, we refer to this as isostasy.





Isostasy takes place on the Earth wherever a large amount of weight is present. This weight might be due to a large mountain, ice from an ice age, or even from manmade structures, such as the weight from large manmade lakes.

Isostasy
Isostasy also takes place when a large amount of weight is removed from an area, causing that portion of the Earth’s crust to rise, such as when ice caps melt.

Play with Isostasy: http://www.geo.cornell.edu/hawaii/220/PRI/isostasy.html

Isostasy

Isostasy (also spelled Isotacy) is a geophysical phenomenon describing the force of gravityacting on crustal materials of various densities (mass per unit volume) that affects the relative floatation of crustal plates. Isostasy specifically describes the naturally occurring balance of mass in Earth's crust .
Continental crust and oceanic crust exist on lithospheric plates buoyant upon a molten, highly viscous aethenosphere. Within Earth's crustal layers, balancing processes take place to account for differing densities and mass in crustal plates. For example, under mountain ranges, the crust slumps or bows deeper into the upper mantle than where the land mass is thinner across continental plains. Somewhat akin to how icebergs float in seawater, with more of the mass of larger icebergs below the water than smaller ones, this bowing results in a balance of buoyant forces termed isostasy.
Isostasy is not a process or a force. It is simply a natural adjustment or balance maintained by blocks of crust of different mass or density.
Within Earth's interior, thermal energy comes from radioactive energy that causes convection currents in the core and mantle. Opposing convection currents pull the crust down into geosynclines (huge structural depressions). The sediments that have collected (by the processes of deposition that are part of the hydrologic cycle ) are squeezed in the downfolds and fused into magma . The magma rises to the surface through volcanic activity or intrusions of masses of magma as batholiths (massive rock bodies). When the convection currents die out, the crust uplifts and these thickened deposits rise and become subject to erosion again. The crust is moved from one part of the surface to another through a set of very slow processes, including those in Earth's mantle (e.g., convection currents) and those on the surface (e.g. plate tectonicsand erosion).
With isostasy, there is a line of equality at which the mass of land above sea level is supported below sea level. Therefore, within the crust, there is a depth where the total weight per unitarea is the same all around the earth. This imaginary, mathematical line is called the "depth of compensation" and lies about 70 mi (112.7 km) below the earth's surface.
Isostasy describes vertical movement of land to maintain a balanced crust. It does not explain or include horizontal movements like the compression or folding of rock into mountain ranges.
Greenland is an example of isostasy in action. The Greenland land mass is mostly below sea level because of the weight of the ice cap that covers the island. If the ice cap melted, the water would run off and raise sea level. The land mass would also begin to rise, with its load removed, but it would rise more slowly than the sea level. Long after the ice melted, the land would eventually rise to a level where its surface is well above sea level; the isostatic balance would be reached again, but in a far different environment than the balance that exists with the ice cap weighing down the land.
Scientists and mathematicians began to speculate on the thickness of Earth's crust and distribution of landmasses in the mid-1800s. Sir George Biddell Airy (18011892) assumed that the density of the crust is the same throughout. Because the crust is not uniformly thick, however, the Airy hypothesis suggests that the thicker parts of the crust sink down into the mantle while the thinner parts float on it. The Airy hypothesis also describes Earth's crust as a rigid shell that floats on the mantle, which, although it is liquid, is more dense than the crust.
John Henry Pratt (18091871) proposed his own hypothesis stating that the mountain ranges (low density masses) extend higher above sea level than other masses of greater density. Pratt's hypothesis rests on his explanation that the low density of mountain ranges resulted from expansion of crust that was heated and kept its volume, but at a loss in density.
Clarence Edward Dutton (18411912), an American seismologist and geologist, also studied the tendency of Earth's crustal layers to seek equilibrium. He is credited with naming this phenomenon "isostasy."
A third hypothesis, eventually developed by Finnish scientist Weikko Aleksanteri Heiskanen (18951971) was a compromise between the Airy and Pratt models.
The model most accepted by modern geologists is the Hayford-Bowie concept. Advanced by American geodesists John Fillmore Hayford (18681925) and John William Bowie (18721940), geodesists, or specialists in geodesy, are mathematicians who study the size, shape, and measurement of Earth and of Earth forces (e.g., gravity). Hayford and Bowie were able to prove that the anomalies in gravity relate directly to topographic features. This essentially validated the idea of isostasy, and Hayford and Bowie further established the concept of the depth of isostatic compensation. Both gentlemen published books on isostasy and geodesy. Hayford was the first to estimate the depth of isostatic compensation and to establish that Earth has an oblate spherical shape (a bowed or ellipsoid sphere) rather than a true sphere.

MARINE POLLUTION

MARINE POLLUTION https://en.wikipedia.org/wiki/Marine_pollution Marine pollution Great pacific garbage patch Deep Sea minin...