topic Re: Place a Layer from a Geodatabase onto a Map (unopened) - Python code in ArcGIS Pro Questions

Place a Layer from a Geodatabase onto a Map (unopened) - Python code

Anthony_R_McKay — Tue, 20 Sep 2022 04:32:38 GMT

A Python project - A river flow analysis - I've generated my vector polyline object for the rivers (four classifications) - how do I move this into a map?

This fc is saved in the gdb - a map already exists.

I want to use Python to add some symbology, but the code I'm using needs the layer to be in a map.

What I need to know is the Python code to send a layer to an existing map from the gdb without opening ArcGIS Pro and doing it manually.

I'd also like to know how to change the line thickness symbology with Python eventually.

Any help would be appreciated.

Re: Place a Layer from a Geodatabase onto a Map (unopened) - Python code

DanPatterson — Tue, 20 Sep 2022 07:18:24 GMT

Did you check out the methods in

Map—ArcGIS Pro | Documentation

Re: Place a Layer from a Geodatabase onto a Map (unopened) - Python code

Anthony_R_McKay — Tue, 20 Sep 2022 07:41:21 GMT

Thanks Dan,

I glanced through this earlier today, but I didn't spot:

"addLayer (add_layer_or_layerfile, {add_position})"

"Provides the ability to add a Layer or LayerFile to a map within a project (.aprx) using basic placement options."

I'll give this a try now.

Cheers,

Anthony

Re: Place a Layer from a Geodatabase onto a Map (unopened) - Python code

Anthony_R_McKay — Tue, 20 Sep 2022 10:09:18 GMT

Not doing at all well with this - I'm either getting the syntax wrong or the file type is incompatible. The examples given are less than helpful.

Here is an illustration of what I want to do = in ArcGIS Pro it would be "right click>add to current map"

Re: Place a Layer from a Geodatabase onto a Map (unopened) - Python code

DanPatterson — Tue, 20 Sep 2022 10:59:37 GMT

If you know the source data, then

Make Feature Layer (Data Management)—ArcGIS Pro | Documentation

followed by

Copy Features (Data Management)—ArcGIS Pro | Documentation

if you want it to be permanent

Re: Place a Layer from a Geodatabase onto a Map (unopened) - Python code

Anthony_R_McKay — Tue, 20 Sep 2022 20:17:33 GMT

Thank you Dan,

That was painless - now I've got a 'Stream.lyr' fc, which should be more acceptable for Map methods.

I'll attempt to move this into the map now. (fingers crossed)

Re: Place a Layer from a Geodatabase onto a Map (unopened) - Python code

Anthony_R_McKay — Tue, 20 Sep 2022 20:54:59 GMT

I feel I'm close, but I can't the script to accept the 'Stream_lyr' value - both full path and workspace get the same error.

This is with ArcGIS closed. The variables are accepted when I run the script with the 'insert layer' commented out.

I'm probably making a rookie mistake - but I'm out of ideas.

Re: Place a Layer from a Geodatabase onto a Map (unopened) - Python code

DanPatterson — Wed, 21 Sep 2022 01:25:49 GMT

I can't tell from the script and the above as to whether you created a "layer" on disk as a *.lyrx file which would be in a folder or you want to make one from a featureclass in the geodatabase.

Re: Place a Layer from a Geodatabase onto a Map (unopened) - Python code

Anthony_R_McKay — Wed, 21 Sep 2022 03:06:57 GMT

'Stream_lyr' is in the original gdb folder where the 'Stream' shapefile was.

I've just realised that the name 'Stream_lyr' is just the name I gave the script to output.

Checked - it's just a copy of my original file with a deceptive name - back to square one. 😞

Thanks anyway, for your help Dan.

So I still need to go from this to this - using Python script.

Re: Place a Layer from a Geodatabase onto a Map (unopened) - Python code

Anthony_R_McKay — Wed, 21 Sep 2022 03:31:58 GMT

It's the inserted layer name that is killing me:

Full paths, indexes, simple strings, nothing works. ValueErrors at every turn

"layerfilename = r"C:\Users\OEM\Documents\Tony\Massey\Paper 2 Labs\Lab7_Rasters\Wellington\Wellington.gdb\Stream"

import arcpy
map_object = arcpy.mp.ArcGISProject(project_path)
insertLyr = arcpy.mp.LayerFile(layerfilename)
m = map_object.listMaps('*')[0]
refLyr = m.listLayers("Catchment_Bnd")[0]
m.insertLayer(refLyr, insertLyr, "BEFORE")
map_object.save()
del map_object"

Re: Place a Layer from a Geodatabase onto a Map (unopened) - Python code

Anthony_R_McKay — Wed, 21 Sep 2022 05:26:39 GMT

Solved - but I had to create a lyrx Layer File and move the layer to the map from there - but the result is what I wanted - thanks to Dan for pointing me in the right direction.

Re: Place a Layer from a Geodatabase onto a Map (unopened) - Python code

DanPatterson — Wed, 21 Sep 2022 10:05:35 GMT

glad something I suggested work