Here's one way of doing it using the comtypes site-package with ArcObjects. The script below opens an MXD, grabs the symbology (renderer) of the first layer of the first data frame, and replaces every other raster layer's symbology (in the same data frame) with it. Essentially you end up with an MXD where all rasters in the first data frame use the exact same symbology. I noticed a side effect though: the symbology between the rasters is linked, so changing the symbology (e.g. a colour or label value) in one of the rasters will change it in all of them. Changing the renderer type though (e.g. Classified to Stretched) breaks this link.Comtypes is available here: http://sourceforge.net/projects/comtypes/. Hopefully symbology will be included in future releases of ArcPy so we can avoid these comtypes work-arounds. Note that I only have access to 9.3 so this is untested in ArcMap 10. import comtypes.client
esriCarto = comtypes.client.GetModule(r'C:\Program Files\ArcGIS\com\esriCarto.olb')
def openMxd(strMxd):
""" Opens an MXD and returns an IMapDocument object. """
try:
objMapDocument = comtypes.client.CreateObject(esriCarto.MapDocument, interface=esriCarto.IMapDocument)
if objMapDocument.IsMapDocument(strMxd):
objMapDocument.Open(strMxd, "")
else:
return 0
return objMapDocument
except:
return 0
strMxd = r"C:\workspace\test.mxd"
# Open the MXD
objMapDocument = openMxd(strMxd)
if objMapDocument:
try:
# Get the first map in the MXD
objMap = objMapDocument.Map(0)
# Get the first layer in the map (i.e. data frame) - MUST BE A RASTER
objSourceLayer = objMap.Layer(0)
# Get the layer's renderer
objRasterLayer = objSourceLayer.QueryInterface(esriCarto.IRasterLayer)
objSourceRasterRenderer = objRasterLayer.Renderer
# Loop through the rest of the layer in the map
for i in range(1, objMap.LayerCount):
objDestinationLayer = objMap.Layer(i)
print objDestinationLayer.Name
# Replace the current layer's renderer with the first layer's renderer
try:
objRasterLayer = objDestinationLayer.QueryInterface(esriCarto.IRasterLayer)
objRasterLayer.Renderer = objSourceRasterRenderer
except:
print "Not a raster"
continue
# Save the MXD and close it.
objMapDocument.Save()
objMapDocument.Close()
except:
print "Error"
objMapDocument.Close()
