# GRASS Help System

## REGIONAL ANALYSIS AND FILTERS

GRASS can also be used to analyze and filter data "regions". Neighborhood filters modify each cell value as a function of the cell values found in its (square) neighborhood. Regional filters make each cell value a function of the values found within its (user-defined) region/clump of cells. A region can be defined as a contiguous group of cells having the same category value. Such filters are useful for imagery analysis and other applications.

Listed below are GRASS programs which can be used for regional analysis and filtering.

- i.zc - r.clump
- r.average - r.volume

For more information on a specific command, select a command and press ESC.

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Automatically created on: Wed Mar 30 04:39:00 2005