Convert from WGS to Geoprojected Coordinate System

AlexisDelforges · ‎10-06-2022

Hello,
Been trying to convert some WGS84 coordinates to another geoprojected coordinate system (for example

RGF_1993_CC47).

point = Point(47.270657348915236, -1.6129342938292524,SpatialReferences.getWgs84())

Then I would need to have a GeographicTransformationStep. I only found the other way around :

RGF_1993_To_WGS_1984_1 (WKID 1671). I don't know if there is a way to reverse this transformation in some way ?

cc47 = GeometryEngine.project(
    point,
    SpatialReference.create(3947),
    transform
) as Point

And if by providing the corresponding WKID of the expected geoprojected coordinate system, will it work ? (transformation only imply to RGF_1993)

If you know how to do it, I'll be glad to get some help to start conversion with this sdk on both iOS and Android.

Thanks in advance.

PS : I was thinking to get one point in CC47 converted to WGS84 and then only find a vector between other WGS84 point from this converted point. Seems to generate a lot of imprecisions, is this technique standard ?

RamaChintapalli · ‎10-19-2022

Hi,
You can get the inverse DatumTranformation from the transformation object itself. To find suitable transformations you can also use Transformation Catalog

Thanks
Rama