Definition of GIS

-
What Is GIS
  • Geographical Information System (GIS) is a computer based information system used to digitally represent and analyze the geographic features present on the Earth’s surface and the events that taking place on it.
  • Geographic Information Systems provide a method for integrating and analyzing spatial (digital map based) information such as "where is the nearest Hospital?" 
  • Alongside related non-spatial information (what services are given there?). 
  • Many people are becoming far more familiar with seeing the results both textually - for example when their phone shows them the nearest Hotel - and on open map systems such as Google Maps. 
GIS Capabilities/ Analysis with GIS
  • Location: What is at a particular location...? Where is it….?
  • Condition: identify a location where certain conditions exist..? 
  • Trends: What has changed since...? 
  • Patterns: What things are related..? 
  • Modeling: What if…? 
The Need for GIS:

The real world has a lot of spatial data
  •   Manipulation, analysis and modeling can be effective and efficiently carried out with a GIS.      the neighborhood of the intended purchase of house location of historical sites to visit 
The earth surface is a limited resource
  • rational decisions on space utilization
  • fast and quality information in decision making
Click the following link to avail PDF file Definition of GIS

Most Viewed Posts

Planetary Winds: Their Types and Definition

-
Image
Planetary winds : These winds being controlled by the pressure belts, blow towards the same direction throughout the whole year. The planetary wind is of three types such as : the trade wind, the westerlies and the polar wind. So, in short, the characteristics of planetary winds are as follows: These winds being controlled by the pressure belts blow towards the same direction throughout the whole year.  Planetary winds are also known as permanent or prevailing winds  Blow from high to low pressure, over the earth surface & oceans throughout the year & in a particular direction  These winds are divided into 3 categories viz. Trade Winds (Tropical Easterlies) Westerlies Polar winds (Polar Easterlies) https://www.affairscloud.com/assets/uploads/2016/04/wind.png 1. Trade Winds (Tropical Easterlies) The sun’s rays fall vertically over the equatorial region, so the air becomes hot and goes upwards. Since the pressure is less upward, the rising air gets r
Read more

The Vance Model of Transport Development

-
Image
Based on his work on the eastern seaboard of America, Vance (1970) developed a five-stage ‘mercantile’ model to illustrate the development of transport links and the growth of the urban hierarchy in North America (Figure 3.6). Although primarily concerned with trade, his model is important in that it stresses the impact of exogenous forces on the evolution of transport networks and their associated spatial patterns. The Vance Model of Transport Development In the initial stage, an accumulating of wealth in Europe prompted overseas expansion of an exploratory nature. Stage 2 sees the beginnings of the transatlantic trade routes based on the one-way trade in staple products such a fish, furs and timber. From 1620, permanent settlement occurs in North America; this results in Atlantic trade in both directions as settlers begin to produce commodities for export and consume manufactured products from a rapidly industrialising Europe (stage 3). Internal transport links are limited
Read more