Geographic data are geographically referenced data wherein individuals can locate and identify features by a spherical coordinate system i.e. latitude and longitude. Based on the nature of the display, this data is classified into two models i.e. vector and raster. Vector Data Vector data models use X and Y coordinates to define the geographic elements. … Read more
Geospatial data is primarily of two types in GIS i.e. spatial data and non-spatial data. Geographical Information System (GIS) is a computer-based programming system which integrates hardware, software, data and user interface for capturing, analyzing and presenting all forms of geographically referenced information over the surface of the earth. It allows users to analyze and visualize … Read more
Harris and Ullman proposed Multiple Nuclei Model in their paper The Nature of Cities (1945) to explain the morphology of a city. They argued that the land use pattern is much more complex than the model given by Burgress, Hoyt & Davis. They observed that the land use pattern is neither in concentric zones or … Read more
Homer Hoyt and M.R. Davis proposed the sector model of urban morphology in 1939. This model was based on observations from 64 cities in the USA. He modified the Concentric Zone Model by Burgess in combination with the impact of transport routes on urban morphology and came up with their own Wedge or Sector Model. … Read more
E.W. Burgess proposed the Concentric zone theory in 1925. This model is also known as ecological theory of city structure or urban morphology. The primary concern of this model was to map the urban social problem i.e. vices and crime in Chicago city. To map the vices and crimes, Burgess mapped the different zone of … Read more
R.P. Mishra gave his growth foci model in response to ideas of Perroux. Growth pole theory by Perroux was widely adopted by western scholars of his time. Boudeville tried to add spatial dimension to this theory but did not take into consideration that elaborate process of trickle down. R.P. Mishra, an Indian Geographer realized that … Read more
Boudeville growth pole theory provides geographic sense to growth pole. Boudeville gave specific geographic and regional character to the growth pole. Perroux’s ideas in Perroux’s Growth Pole Theory does not specify the geographic extent of the growth pole. Boudeville tried to supplement Perroux’s idea by providing geographic dimension. He wrote his ideas in his book … Read more
The growth pole theory was postulated by Francois Perroux in 1955. He considered growth pole as key driver of economic activities and development in a region. Basic idea behind his theory is that the growth in a large city propels the growth in the all the areas surrounding the large city due to exchange of … Read more
What are Corals and Coral Reefs? Coral or coral polyps are lime secreting small marine invertebrates. Their dead bodies result in built up of coral reefs. They live in large colonies. When these corals die, their skeleton accumulate on one site. The continued accumulation and compaction of these skeletons leads to the formation of coral … Read more
India is a large and diverse country. Most of its diversity is contributed by immigration. The Mobility Transition Model in India has great relevance. It has one of the oldest civilization in the world. India have not found any evidence of primitive men like in Africa and Europe. Therefore, it can be said that most … Read more