GRASS GIS manual: r.pi.export

NAME

r.pi.export - Export of patch based information.

KEYWORDS

raster

SYNOPSIS

r.pi.export
r.pi.export help
r.pi.export [-aq] input=name output=string [values=string] [id_raster=string] [patch_raster=string] stats=string[,string,...] [title="phrase"] [--overwrite] [--verbose] [--quiet]

Flags:

-a: Set for 8 cell-neighbors. 4 cell-neighbors are default
-q: Run quietly
--overwrite: Allow output files to overwrite existing files
--verbose: Verbose module output
--quiet: Quiet module output

Parameters:

input=name: Name of input raster map
output=string: Name for the output ASCII-file
values=string: Name for the output ASCII-file with patch values
id_raster=string: Name for the ID raster map
patch_raster=string: Name for the patch raster map
stats=string[,string,...]: Statistical method to perform on the values; Options: average,variance,standard deviation,median,min,max
title="phrase": Title for resultant raster map

DESCRIPTION

This module exports raster patch values (no single pixels, but single individual patch values), which can be used for subsequent analysis in R and later import into GRASS again, using r.pi.import.

NOTES

This module...

EXAMPLE

An example for the North Carolina sample dataset: generating a patch index map for later export:

r.pi.index input=landclass96 output=landclass96_forestclass5_area keyval=5 method=area

export this resulting map:

r.pi.export input=landclass96_forestclass5_area output=patch_area_out values=patch_area_values id_raster=forestclass5_ID stats=average,variance,min

various resulting files are generated:
patch_area_out: a text file with the average, variance and minimum statistics as defined above and additionally informaton about the percentage coverage (landcover) and the number of fragments (number) of the analysed landcover.
patch_area_values: a text file with the actual patch values not the statistics. The first column is providing the corresponding patch ID, which is also existing in the forestclass5_ID raster map (here:0-878). The second column is providing the percentage cover of each patch (sum is equal the overall coverage: 0.506). The third column is holding the actual patch index value (here area; e.g. patch 0: 12).

AUTHORS

Programming: Elshad Shirinov
Scientific concept: Dr. Martin Wegmann
Department of Remote Sensing
Remote Sensing and Biodiversity Unit
University of Wuerzburg, Germany

Last changed: $Date$

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