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NAMEr.statistics - Calculates category or object oriented statistics.KEYWORDSraster, statistics, zonal statisticsSYNOPSISr.statisticsr.statistics --help r.statistics [-c] base=name cover=name method=string output=name [--overwrite] [--help] [--verbose] [--quiet] [--ui] Flags:
Parameters:
DESCRIPTIONr.statistics is a tool to analyse exploratory statistics of a categorical "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). All cells in the base layer are considered one object for the analysis. For some applications, one will first want to prepare the input data so that all areas of contiguous cell category values in the base layer are uniquely identified, which can be done with r.clump.The available methods are the following:
Setting the -c flag the category labels of the covering raster layer will be used. This is nice to avoid the GRASS limitation to integer in raster maps because using category values floating point numbers can be stored. All calculations create an output layer. The output layer is a reclassified version of the base layer with identical category values, but modified category labels - the results of the calculations are stored in the category labels of the output layer. NOTESFor floating-point cover map support, see the alternative r.stats.zonal. For quantile calculations with support for floating-point cover maps, see the alternative r.stats.quantile.EXAMPLESCalculation of average elevation of each field in the Spearfish region:r.statistics base=fields cover=elevation.dem out=elevstats method=average r.category elevstats r.mapcalc "fieldelev = @elevstats" r.univar fieldelev SEE ALSOr.category, r.clump, r.mode, r.mapcalc, r.neighbors, r.stats.quantile, r.stats.zonal, r.univarAUTHORMartin Schroeder, Geographisches Institut Heidelberg, GermanySOURCE CODEAvailable at: r.statistics source code (history)Main index | Raster index | Topics index | Keywords index | Graphical index | Full index © 2003-2021 GRASS Development Team, GRASS GIS 7.8.6 Reference Manual
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