topic Re: Zoom to Selected Features Extent in a Layer within a Map Service in Python Questions

Zoom to Selected Features Extent in a Layer within a Map Service

HenryKo — Mon, 22 Aug 2011 02:21:21 GMT

Hi,

I have a map document, and it has layers coming from non-cached map services. The map services can have features selected.

How do I zoom to the selected features for a layer (i.e. a map service) in arcpy?

The script, map services and map document are all ArcGIS 10 SP2.

Thanks.

Re: Zoom to Selected Features Extent in a Layer within a Map Service

StephanieWendel — Mon, 22 Aug 2011 11:29:10 GMT

This can be done by using the Method of zoomToSelectedFeatures () for data frames or Layer.getSelectedExtent for layers.

For more information, see this link on the data frame method: http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#/DataFrame/00s300000003000000/

and this link for more on the layer method:
http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#/Layer/00s300000008000000/

There is a short sample and explanations that should help give you an idea of how each works.

Re: Zoom to Selected Features Extent in a Layer within a Map Service

HenryKo — Tue, 23 Aug 2011 07:48:28 GMT

Thank you for your reply.

I created a very simple MXD with a base map (a cached map service), and a non-cached map service (which it has a layer called "Rail Roads"). I ran the code below and it crashes. Is this a known issue?

import arcpy
m = arcpy.mapping.MapDocument("test3.mxd")
d = arcpy.mapping.ListDataFrames(m)[0]
lyrs = arcpy.mapping.ListLayers(m, "", d)
for l in lyrs:
     print l.name
     if (l.name == "Rail Roads"):
         d.extent = l.getExtent()
d.zoomToSelectedFeatures()

Re: Zoom to Selected Features Extent in a Layer within a Map Service

StephanieWendel — Sat, 11 Dec 2021 18:38:25 GMT

Make sure in this line you use the full path the the map document:

m = arcpy.mapping.MapDocument("test3.mxd")

For example:

m = arcpy.mapping.MapDocument(r"C:\Data\MapDocs\test3.mxd")

The way you have it right now, it is unsure of where to find that document.

Re: Zoom to Selected Features Extent in a Layer within a Map Service

HenryKo — Tue, 23 Aug 2011 22:28:06 GMT

Thanks.

I tried it, still have the same results (i.e. the l.getExtent() part crashes if the layer is part of a non-cached map service).

In fact, I tried it in the Python window within ArcMap with

m = arcpy.mapping.MapDocument("CURRENT")

and it did not work.

Re: Zoom to Selected Features Extent in a Layer within a Map Service

MathewCoyle — Wed, 24 Aug 2011 13:11:25 GMT

Shot in the dark, but did you try setting "False" to get the geometric extent instead of symbolized extent?

d.extent = l.getExtent(False)

I doubt that would be an issue, but like I said, shot in the dark.

Another thing, will there always be a selection? There is another method to get an extent of selected features.
d.extent = l.getSelectedExtent()

You could also try getting just the layer you want instead of going through all of them recursively,
l = arcpy.mapping.ListLayers(mxd, "Rail Roads", d)[0]