## DESCRIPTION

r.stats.zonal is a tool to analyse exploratory statistics of a floating-point "cover layer" according to how it intersects with objects in a "base layer". A variety of standard statistical measures are possible (called "zonal statistics" in some GIS).

## NOTES

r.stats.zonal is intended to be a partial replacement for r.statistics, with support for floating-point cover maps at the expense of not supporting quantiles. For this, see r.stats.quantile.

## EXAMPLE

In this example, the raster polygon map `zipcodes` in the North Carolina sample dataset is used to calculate zonal raster statistics using the `elevation` raster map:

    g.region raster=zipcodes -p

    # pixel count in zipcode areas
    r.stats.zonal base=zipcodes cover=elevation method=count output=zipcodes_elev_count
    r.colors zipcodes_elev_count color=gyr -g

    # average elevation in zipcode areas
    r.stats.zonal base=zipcodes cover=elevation method=average output=zipcodes_elev_avg
    r.colors zipcodes_elev_avg color=elevation -g

## SEE ALSO

r.quantile, r.stats.quantile, r.statistics

## AUTHOR

Glynn Clements

Last changed: $Date$