Allow projection change with ST_Transform

[PanierAvide]

First of all, thanks for this useful framework. Currently, it doesn't support projection change, you can only change the SRID in metadata but it doesn't modify object coordinates in returned data. Adding a function with similar to ST_Transform in Postgis (see http://postgis.net/docs/ST_Transform.html) would be very useful, for example for creating buffers in a metric projection.

[randallwhitman]

Cross-reference Esri/geometry-api-java#64

[randallwhitman]

Reference to doc

[randallwhitman]

Maybe related: #83

[chaosmail]

I would be also very interested in this feature, as well willing to help. I guess this could be implemented by adding an existing library for projections such as proj4j or cts. Are there any plans to support ST_Transform in the future?

[randallwhitman]

Are there any plans to support ST_Transform in the future?

We [Esri-Members] currently have no plans that I know of to work on that ourselves.
This is Open-Source and accepts contributions.

[randallwhitman]

Cross-reference https://geonet.esri.com/thread/186465-geometry-vs-geography

[randallwhitman]

Side note relating to above-referenced proj4j - the Esri UC 2018 Q&A states that Esri is "funding a portion of the work to enhance/update PROJ4" (under "What are Esri's contributions to the open source community?")

[randallwhitman]

Discussion on #186 is more detailed, so I'll mark this one a duplicate of that one.