Summary
Returns a list of valid transformation methods for converting data from one spatial reference to another. An extent can be used to narrow the list of valid transformation methods for a specific geographic area.
Syntax
ListTransformations (from_sr, to_sr, {extent})| Parameter | Explanation | Data Type |
from_sr | The starting geographic coordinate system. Can be specified with a SpatialReference object, the name of the spatial reference, or a path to a projection file (.prj). | SpatialReference |
to_sr | The final geographic coordinate system. Can be specified with a SpatialReference object, the name of the spatial reference, or a path to a projection file (.prj). | SpatialReference |
extent | Only transformations that span the entire extent will be returned. The extent needs to be specified in coordinates from the in_sr. When working with data, the extent on a Describe object can be used. | Extent |
| Data Type | Explanation |
| String | A list of valid transformation methods. |
Code sample
Use ListTransformations to identify valid transformations for projecting from one coordinate system to another.
import arcpy
from_sr = arcpy.SpatialReference('WGS 1984')
to_sr = arcpy.SpatialReference('NAD 1927 StatePlane California VI FIPS 0406')
extent = arcpy.Extent(-178.217598182, 18.9217863640001,
-66.969270909, 71.4062354550001)
transformations = arcpy.ListTransformations(from_sr, to_sr, extent)