Bug Number BUG-000110015
Submitted Dec 06, 2017
Modified Jul 28, 2020
Severity Low
Applies To ArcGIS GIS Server
Version Found 10.4.1
Prog Language N/A
Server Platform Windows 2012 R2
Client Platform Windows 2012 R2
Database N/A
Locale N/A
Status Not in Current Product Plan
Version Fixed
SP Fixed

Bug BUG-000110015


The PointGeometry object projectAs method generates inconsistent output between ArcGIS Desktop geoprocessing tool and geoprocessing service when projecting from WKID 4236 to WKID 3857.

Additional Information

This is the default projection engine behavior of ArcGIS Desktop and ArcGIS GIS Server, not a geoprocessing service issue. When you use the arcpy function ptGeometry.projectAs(webMercatorSR), there is a second optional parameter transformation_name. This transform name means the datum of a projection. If users provide some value, in addition to re-projecting the outcome coordination (from the first parameter), it also transform the Projection datum (second parameter). On ArcGIS Desktop, when this optional parameter is not given, the default value is none. On ArcGIS GIS Server however, it sets something appropriate for users automatically. This is because the design on ArcGIS GIS Server comes later then ArcGIS Desktop. Also there is no configuration option, such as the Transformation parameter in the Environment GUI of ArcMap, on the server. So projection on the server does that for users instead asking the user to provide it.

Alternate Solution

If users want a consistent result between ArcGIS Desktop and ArcGIS GIS server, replace the above-mentioned line of code with ptGeometry.projectAs(webMercatorSR, "Hu_Tzu_Shan_To_WGS_1984").