topic Re: Different Map Service for Different Coordinate Systems ? in Publishing and Managing Services Questions

Different Map Service for Different Coordinate Systems ?

User35489 — Sun, 02 Feb 2025 11:22:39 GMT

Hello There,

We currently maintain two different database instances storing the same data for two different coordinate systems, lets say Coord1 and Coord2.

Is there a way to have have only one instance with either Coord1 or Coord2 and change the coordinate system on ArcGIS Server level or Web Application level for the users instead of having two databases and two different Map/Feature services published for Coord1 and Coord2.

Thanks in Advance

Environment: ArcGIS Enterprise Federated 11.3, Oracle 19c

Re: Different Map Service for Different Coordinate Systems ?

berniejconnors — Mon, 03 Feb 2025 13:49:51 GMT

Why do you publish it in two coordinate systems? Is it to ensure accurate measurements? Is it to allow for faster draw times?

Here are some thoughts to consider:

When you add a map service to an AGOL web map, the map service is reprojected on the fly to the basemap's coordinate system.
The ExB Measurement widget uses the ellipsoid-based geodesic calculation to calculate measurements. https://doc.arcgis.com/en/experience-builder/latest/configure-widgets/measurement-widget.htm

We only publish in one coordinate system, and it is not Web Mercator. We publish in EPSG 2953, https://geonb.snb.ca/arcgis/rest/services

Bernie.

Re: Different Map Service for Different Coordinate Systems ?

User35489 — Tue, 04 Feb 2025 12:46:00 GMT

This is requested by the Application Developer, and it seems, there is a requirement from the Users side.
Thanks @berniejconnors for your input

Re: Different Map Service for Different Coordinate Systems ?

berniejconnors — Tue, 04 Feb 2025 16:51:57 GMT

If you know why they are asking for the same feature class in two map services with different coordinate systems you can help the client understand why it is / is not necessary. Perhaps they want a geographic coordinate system for a globe view and a projected coordinate system for a 2D view??