/********************************************************************* * GRASS program to create a raster map with non-zero data * in random locations. * Locations will be within non-zero data in the input layer. * (unless -z option specified) * If it necessary to restrict the locations to only some categories * of the input map, a reclass map should be constructed first * and used as input to this program. * * Number of random cells can be a fixed number or a percentage of cells. * * Resulting raster map consists of original cell values at the selected * random locations and zero elsewhere. * * A sitefile may optionally be created. * * Usage: * r.random [-iqz] input=name [raster_output=name] [sites_output=name] n=n[%] * * -i mean report number of total cells and null cells * -q means run quietly * -z means generate random locations for zero-data as well * *********************************************************************/