Zonal Operation and Types: Single Raster and Two Raster Zonal Operations (Especially for GATE-Geospatial 2022)

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A zonal operation is a spatial function that computes an output value of each cell using the zone containing that cell. A zonal operation works with groups of cells of same values or like features. These groups are called zones. Zones may be contiguous or noncontiguous.

A zonal operation may work with a single raster or two rasters.

Diagram Shows a Zonal Operations Work with Two Types of Oper …

1. Single Raster Zonal Operations

Given a single input raster, zonal operations measure the geometry of each zone in the raster, such as area, perimeter, thickness, and centroid.

This Image Shows Single Raster Zonal Operations Example

2. Two Raster Zonal Operations

Given two rasters in a zonal operation, one input raster and one zonal raster, a zonal operation produces an output raster, which summarizes the cell values in the input raster for each zone in the zonal raster.

This Image Shows Two Raster Zonal Operations Example

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