best way to get size on disk of raster

KimFisher

Hello all,

I have a script that requires an input raster. I would like to get the size on disk of this raster, whether it be stored in files or gdb of whatever flavor, and in whatever raster format. I cannot find a built-in gp/arcpy function for this -- neither Describe() nor GetRasterProperties() seem to provide it.

I know about os.path.getsize() and could write a function to find the size of a directory, but not inside a personal/enterprise gdb, and anyway writing a function to anticipate every possible raster format and storage location format seems like a daunting task.

Has anybody done this already, or have suggestions about a good approach?

Thanks,
Kim Fisher

MarkCarroll

You can calculate the size of the data by calculating the area (in pixels) times the number of bytes times the number of layers.  For example:

If your image is 4800 pixels wide x 4800 pixels high and is a single 8-bit plane the size is calculated as

4800*4800*1*1

if it is 16-bit or 32-bit it would be 4800*4800*2*1; or 4800*4800*4*1.  That does not account for the length of the header, and that will vary depending on the format but should be fairly small.  Compression will, obviously, also reduce the overall size of the file and I don't know how you would calculate that accurately.

Hope this helps.