Re: [GRASS-dev] r.stats area question
Eric Goddard wrote: My coordinate system is in U.S. Feet (I know, I know...we're still in the dark ages). The numbers do appear to be meters, but I just wanted to confirm that the output isn't in feet because of the assuming the map's coordinate system is in meters part. Areas are always in square metres, provided that sufficient information is available to perform conversion. For lat-lon locations, the conversion is based upon the ellipsoid parameters and the cell's latitude. For projected locations, the area per cell is a constant based upon the location's declared units (i.e. the meters= value in the ouput of g.proj -g). This has been the case since at least the oldest version in the repository (~14 years ago). AFAICT, the only situation where you could get output in map units is for an X-Y location or a projected location which lacks a PROJ_UNITS file. -- Glynn Clements gl...@gclements.plus.com ___ grass-dev mailing list grass-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-dev
[GRASS-dev] r.stats area question
Hi all, Quick question regarding the units of area output from r.stats. the -a flag specifies the output area to be printed in square meters. The manual, however, says: Area statistics are given in units of square meters and/or cell counts. and: If a single map layer is specified on the command line, a list of areas in square meters (assuming the map's coordinate system is in meters) for each category in the raster map layer will be printed... My coordinate system is in U.S. Feet (I know, I know...we're still in the dark ages). The numbers do appear to be meters, but I just wanted to confirm that the output isn't in feet because of the assuming the map's coordinate system is in meters part. Thanks, Eric ___ grass-dev mailing list grass-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-dev
