topic Processing large rasters as chunks using arcpy in ArcGIS 10.x in ArcGIS Image Server Questions https://community.esri.com/t5/arcgis-image-server-questions/processing-large-rasters-as-chunks-using-arcpy-in/m-p/86976#M1512 <HTML><HEAD></HEAD><BODY><P>Hi all,</P><P></P><P>I have a 45000x37000 multiband satellite image (raster) in a geodatabase and I need to read it into a numpy array to do some processing. I have previously used gdal within arcGIS Pro for this, but am currently limited to ArcGIS 10.x with no gdal. I am having trouble reading a raster of this size into a numpy array in arcpy, even when trying to use numpy.memmap.</P><P></P><P>I would like to divide my raster up and process each chunk individually, but for some reason the split raster tool changes cell values, and not by just a little. I used the "NEAREST" resampling type, which supposedly doesn't change the values.</P><P></P><P>Does anyone know how to divide up a raster in ArcGIS 10 without changing the values?</P></BODY></HTML> Wed, 29 Jul 2020 18:17:06 GMT WadeWall 2020-07-29T18:17:06Z Processing large rasters as chunks using arcpy in ArcGIS 10.x https://community.esri.com/t5/arcgis-image-server-questions/processing-large-rasters-as-chunks-using-arcpy-in/m-p/86976#M1512 <HTML><HEAD></HEAD><BODY><P>Hi all,</P><P></P><P>I have a 45000x37000 multiband satellite image (raster) in a geodatabase and I need to read it into a numpy array to do some processing. I have previously used gdal within arcGIS Pro for this, but am currently limited to ArcGIS 10.x with no gdal. I am having trouble reading a raster of this size into a numpy array in arcpy, even when trying to use numpy.memmap.</P><P></P><P>I would like to divide my raster up and process each chunk individually, but for some reason the split raster tool changes cell values, and not by just a little. I used the "NEAREST" resampling type, which supposedly doesn't change the values.</P><P></P><P>Does anyone know how to divide up a raster in ArcGIS 10 without changing the values?</P></BODY></HTML> Wed, 29 Jul 2020 18:17:06 GMT https://community.esri.com/t5/arcgis-image-server-questions/processing-large-rasters-as-chunks-using-arcpy-in/m-p/86976#M1512 WadeWall 2020-07-29T18:17:06Z