topic Re: Extent of in_memory layer/adding an in_memory layer to map in Python Questions

Extent of in_memory layer/adding an in_memory layer to map

Anonymous User — Tue, 05 Jan 2021 23:28:26 GMT

Hello,

I'm trying to get the extent of an in_memory layer from a standalone script.

However I'm having some issues running into this.

For some reason I can't add the in_memory layer to the map current map. See could below. the # are just different ways I've tried.

I keep getting an error saying

s2 = map.listLayers('parcels_lyr')[0]
IndexError: list index out of range

I'm pretty sure that it can't find the layer. When I list the layers it is not in there.

The goal is to export a map with the extent of a 2 mile buffer (in_memory layer) around the original boundary. So it will show the original boundary with some room around all sides. But I don't want to show the buffered boundary, it's just to get the extent.

arcpy.analysis.Buffer(s,r"in_memory\buffer2","2 MILE") arcpy.MakeFeatureLayer_management(r"in_memory\buffer2", "parcels_lyr") for lyr in map.listLayers(): arcpy.AddMessage(lyr.name) s2 = map.listLayers('parcels_lyr')[0] #map.addDataFromPath(r"in_memory\buffer2") #map.insertLayer(s, r"in_memory\buffer2", "BEFORE") #lyt.camera.setExtent(lyt.getLayerExtent(s2, False, True))

ArcPro 2.5 python 3.x

Thanks!

Re: Extent of in_memory layer/adding an in_memory layer to map

Anonymous User — Wed, 06 Jan 2021 00:35:03 GMT

Hi @Anonymous User ,

It's documented here that when using the in_memory workspace with geoprocessing models, that the output needs to be written to disk to be displayed as a layer in the map - and while the documentation isn't explicit about this also applying to Python scripts, I suspect the same limitation would also apply.

If however, our main interest in the in_memory buffer output is getting its extent so we can use that to set the view extent for our map export - I'd suggest we use a slightly different approach so that we can get the extent directly from the in_memory feature class, without having to create a layer in the map. One such approach we could use for this purpose would be to use the arcpy.da.Describe function

arcpy.analysis.Buffer(s,r"in_memory\buffer2","2 MILE") buff_extent = arcpy.da.Describe(r"in_memory\buffer2")['extent'] # Use the buff_extent variable to set camera extent, then export the map ...

Hope this helps!

Re: Extent of in_memory layer/adding an in_memory layer to map

Anonymous User — Wed, 06 Jan 2021 02:43:03 GMT

Perfect! Just had to change the CS to get it in the correct units!

Thanks!