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Raster Overlay
In raster overlay, the pixel or grid cell values in each map are combined using arithmetic and Boolean operators to produce a new value in the composite map. The maps can be treated
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Query by circle,
Query by line,
Query by polygon,

A more complex query still is one that uses both geometric and attributes search criteria together. Many GIS force the separation of the two different types of query. However, some
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Analysis of Geographic Data

ANALYSIS - What? & Why?
The heart of GIS is the analytical
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•         vector representation only required the positions of two points.

The size of the cells in a raster file is an important factor. Smaller cells improve image quality because they increase
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Principal Functions of GIS
Data Capture
Data used in GIS often come from many types, and are stored in different ways. A GIS
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Map Extent
The aerial extent of map is the area on the Earth's surface represented on the map. It is the
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Overview of GIS

Introduction
Geographic Information System (GIS) is a computer based information system used to
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