topic Re: Layer.replaceDataSource in Python Questions

Layer.replaceDataSource

MaciekFertala1 — Thu, 27 Sep 2012 12:01:36 GMT

Hi,
I'm trying to change layer data source from one shape file to another in different workspace (directory).

mxd = arcpy.mapping.MapDocument(r"Z:\02_GIS\Project\mxd\P01.mxd")
print "mxd"
df = arcpy.mapping.ListDataFrames(mxd, "Layers")[0]
lyrfile = arcpy.mapping.Layer(r"Z:\Maps\GIS_utilities\python_script\lyr\_kabel.lyr")
print lyrfile.workspacePath # old path
lyrfile.replaceDataSource(r"Z:\02_GIS\Project\wektor", "SHAPEFILE_WORKSPACE", "P01_RIVER.shp")

But this way its not working. What should I change?

Thanks form help,
MF

Re: Layer.replaceDataSource

JakeSkinner — Sun, 12 Dec 2021 01:09:34 GMT

Try the following:

mxd = arcpy.mapping.MapDocument(r"Z:\02_GIS\Project\mxd\P01.mxd")
df = arcpy.mapping.ListDataFrames(mxd, "Layers")[0]
for lyr in arcpy.mapping.ListLayers(mxd, "*", df):
    if lyr.name == "_kabel":
            lyr.replaceDataSource(r"Z:\02_GIS\Project\wektor", "SHAPEFILE_WORKSPACE", "P01_River")

mxd.save()

Re: Layer.replaceDataSource

JeffBarrette — Sun, 12 Dec 2021 01:09:37 GMT

Are you trying to change the workspace for a data source in a layer file or for a layer in an mxd? Both scenarios are supported but the two snippets of code are doing different things?

If you are trying to work with layer files you are missing one step. Treat a layer file like an MXD. Once you connect to it, you still need to search for the layers within it using ListLayers.

#In example below, a layer file if pointing to a shapefile in c:\temp
#It is redirected to a data source in c:\active
#and then saved to a new layer file (in c:temp)
#Old shapefile was usa.shp, new one is use2.shp

import arcpy
lyrFile = arcpy.mapping.Layer(r"C:\Temp\usa.lyr")
for lyr in arcpy.mapping.ListLayers(lyrFile):                  #THIS IS THE MISSING PIECE
  if lyr.name == "usa":
    lyr.replaceDataSource(r"C:\Active", "SHAPEFILE_WORKSPACE", "usa2")
lyrFile.saveACopy(r"C:\Temp\usa2.lyr")

Jeff

Re: Layer.replaceDataSource

MaciekFertala1 — Mon, 01 Oct 2012 08:50:44 GMT

Im trying to change data source in a layer in an mxd.
MF

Re: Layer.replaceDataSource

JeffBarrette — Tue, 02 Oct 2012 13:11:00 GMT

Then try what Jake suggests. In your original code, you reference an MXD but never a layer within it. Rather you are referencing a layer file via the .Layer function. You need to use ListLayers to reference a layer in an MXD. Then you can switch out the data source.

Jeff

Re: Layer.replaceDataSource

Yaron_YosefCohen — Thu, 11 Sep 2014 05:33:16 GMT

according to Jake note this script work fine for me:

import arcpy, os, sys

from arcpy import env

env.workspace = r"F:\Projects\Nadav\gany_tikva\gis"

for mxdname in arcpy.ListFiles("*.mxd"):

print mxdname

mxd = arcpy.mapping.MapDocument(r"F:\Projects\Nadav\gany_tikva\gis\\" + mxdname)

df = arcpy.mapping.ListDataFrames(mxd, "Layers")[0]

for lyr in arcpy.mapping.ListLayers(mxd, "*", df):

if lyr.name == "50000.sid":

# very importent that "RASTER_WORKSPACE" will change according to

# the data we want to replace

lyr.replaceDataSource(r"F:\GIS\topo_50000", "RASTER_WORKSPACE", "50000.sid", True)

print 'replaceDataSource'

mxd.save()

del mxd