Get smallest extent from a list of rasters

AndrewDavies

Hi all,

I am completely lost here, I am trying to get the smallest extent of a raster from a list of rasters, if I set my workspace, and then use
arcpy.env.extent = "MINOF"
print "Extent is: " + str(arcpy.env.extent)

I get an output:

Extent is "MINOF".

If I try to set MINOF as an Extent variable (i.e. arcpy.env.extent = Extent("MINOF")  ), I get 0 0 0 0 NaN NaN etc etc.

I can't find on any forum an idea to help me get the smallest extent of all of the rasters in my directory or rasterList.

Any ideas?

Thanks
Andy

Luke_Pinner

See the arcpy ListRasters and Describe methods.

Basically loop through the rasters in the workspace and describe them to get the extent and calculate the minimum.

And here's an example:

import arcpy  # Set the current workspace arcpy.env.workspace = "c:/data/DEMS"  # Get the list of rasters in the workspace rasters = arcpy.ListRasters()  for raster in rasters:     ext=arcpy.Describe(raster).extent     try:         xmin=max(xmin,ext.XMin)         ymin=max(ymin,ext.XMax)         xmax=min(xmax,ext.YMin)         ymax=min(ymax,ext.YMax)     except NameError:         xmin,ymin,xmax,ymax=ext.XMin, ext.XMax, ext.YMin, ext.YMax          minext=[xmin,ymin,xmax,ymax]