How to programmatically determine whether a spatial reference factory code is valid?

Question

I am using the following code segment to create a spatial reference.

    spatialReferance = arcpy.SpatialReference()
    spatialReferance.factoryCode = spatialReferanceFactoryCode
    spatialReferance.create()

But it gives the following error:

Runtime error : ERROR 999999: Error executing function. the input string is not a geographic or projected coordinate system

How can I programmatically determine whether a factory code is valid or not?

What is the value of spatialReferanceFactoryCode? – om_henners Oct 10 '12 at 05:09 — om_henners, Oct 10 '12 at 05:09
@om_henners: spatialReferanceFactoryCode = 32146 – Emi Oct 10 '12 at 05:17 — Emi, Oct 10 '12 at 05:17

user2856 · Accepted Answer · 2018-03-13T03:29:32.383

8

See Do ArcGIS SpatialReference object factory codes correspond with EPSG numbers? in particular @mkennedy and @blah238 answers.

As to whether a factory code is valid or not... In Python, you can use the EAFP method (Easier to Ask for Forgiveness than Permission)

try:
    spatialReference.factoryCode = spatialReferenceFactoryCode
    spatialReference.create()
except RuntimeError:
    print 'factoryCode is not valid'

edited Mar 13 '18 at 03:29

answered Oct 10 '12 at 05:14

user2856

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Actually I want to check if the code valid or not. Is there any property that can tell me that? – Emi Oct 10 '12 at 05:25
1

@Emi Try spatialreference.org (it is by the way) – om_henners Oct 10 '12 at 05:35
@om_henners: sorry for the misunderstanding. Actually I want to do it programmatically. – Emi Oct 10 '12 at 05:56
4

There is no way to check whether a code is valid without trying to create a coordinate system (spatial reference). – mkennedy Oct 10 '12 at 17:28
+1 for EAFP method. That is so python! Try to do it and catch it if it breaks.. there isn't a IsNumeric for strings in python (off topic but related) possibly because you can find out in the same way. – Michael Stimson Aug 31 '15 at 02:25

How to programmatically determine whether a spatial reference factory code is valid?

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