Local Operations (Raster) : Local Operations Performed on Cells (Especially for GATE-Geospatial 2022)

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Figure Shows Local Operation in Raster Analysis

The value generated in the output raster is a function of cell values at the same location on in the input layers. When you take the temperature average in each cell using two raster grids, this is an example of a local operation.

Local functions work on a cell by cell basis. The most common is simple map algebra.

Example Shows the Simple Map Algebra

Uses of Local Functions

Local functions for raster GIS seem simple, but are the basis of much raster analysis. Potential operators fall into six categories:

Diagram Shows Six Categories of Potential Operations

For example:

Image Shows How to Use Local Functions

How map algebra lets you use local functions:

  • Map algebra or performing operations on layers lets us use this wide variety of mathematical and classification tools in a local context.
  • Reclassification is the most widely used local operator.
Diagram Shows Reclassification Used Local Operator

Soil types are compared with zoning suitability to find those data

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