On 10/2/07 4:41 AM, "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> wrote:
> The GIS raster data model states that each cell contains > one and exactly one value. > That's why raster maps are also called "fields" in spatial > statistics. And it is why raster operations are so simple > and efficient. > > ESRI ArcGIS 9.2 (not GRASS) has raster maps with multiple > attribute values attached to each cell -- but that's a > perversion of the entire concept in my opinion. > > I am sure there must be a way of dividing your problem into smaller > steps such that you will be able to solve it with the standard > raster model. > >> Hi, >> I have several raster maps (aspect, slope, tand_curv etc.). I would like >> to combine these raster maps to one raster but without losing any >> information. As a result i would like to have one raster map with several >> attributes (aspect, slope, tang_curv etc.). And then I would like to check >> Pixel by Pixel >> >> if slope = steep and aspect = North etc. >> then >> "Value of the checked pixel" + 10 >> >> else I agree with Benjamin. This is what the map calculator is used for. r.mapcalc 'newmap = if(slope="steep" && aspect="north",10,[do something else])' You can also create very complex statements using eval. Michael >> >> .... >> >> Has anybody done this before? Is it possible to combine several raster >> maps without losing any information? >> >> Greets >> >> Andreas >> -- >> Ist Ihr Browser Vista-kompatibel? Jetzt die neuesten >> Browser-Versionen downloaden: http://www.gmx.net/de/go/browser >> >> _______________________________________________ >> grassuser mailing list >> [email protected] >> http://grass.itc.it/mailman/listinfo/grassuser >> >> > > > __________________________________________ Michael Barton, Professor of Anthropology Director of Graduate Studies School of Human Evolution & Social Change Center for Social Dynamics & Complexity Arizona State University phone: 480-965-6213 fax: 480-965-7671 www: http://www.public.asu.edu/~cmbarton _______________________________________________ grassuser mailing list [email protected] http://grass.itc.it/mailman/listinfo/grassuser
