Created
May 6, 2022 19:01
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Pygeoprocessing raster_calculator call to convert from a TauDEM D8 flow direction to pygeoprocessing D8 flow direction.
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| import numpy | |
| import pygeoprocessing | |
| from osgeo import gdal | |
| def convert_taudem_flow_dir_to_pygeoprocessing( | |
| taudem_flow_dir_raster_path, target_flow_dir_raster_path): | |
| source_nodata = pygeoprocessing.get_raster_info( | |
| taudem_flow_dir_raster_path)['nodata'][0] | |
| dest_nodata = 128 # Matches pygeoprocessing-produced flow dir nodata. | |
| def _convert(taudem_flow_dir_array): | |
| dest_array = numpy.full(taudem_flow_dir_array.shape, dest_nodata, | |
| dtype=numpy.uint8) | |
| valid_pixels = (taudem_flow_dir_array != source_nodata) | |
| dest_array[valid_pixels] = taudem_flow_dir_array[valid_pixels] - 1 | |
| return dest_array | |
| pygeoprocessing.raster_calculator( | |
| [(taudem_flow_dir_raster_path, 1)], _convert, | |
| target_flow_dir_raster_path, gdal.GDT_Byte, dest_nodata) | |
| if __name__ == '__main__': | |
| convert_taudem_flow_dir_to_pygeoprocessing( | |
| 'my_taudem_d8_flow_dir_raster.tif', | |
| 'pygeoprocessing_d8_flow_dir.tif') |
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