pyflwdir.FlwdirRaster.dem_dig_d4# FlwdirRaster.dem_dig_d4(elevtn, rivmsk=None, nodata=-9999.0)[source]# Returns the hydrologically adjusted elevation where for each cell river cell there is an adjacent D4 connected cell which has has the same or lower elevation as the current cell. Parameters: elevtn (2D array of float) – elevation raster rivmsk (2D array of bool, optional) – river mask Returns: elv_out – elevation raster Return type: 2D array of float