This is the same as esri's "local":
https://www.hydrometronics.com/downloads/Ellipsoidal%20Orthographic%20Projection.pdf
On 5/30/2023 5:24 PM, Javier Jimenez Shaw wrote:
Hi
Some use cases of Esri "local" projection are arriving to my desk.
This projection works in Esri software, but not in PROJ (obviously
also not in QGIS)
One example is this WKT1_ESRI
PROJCS["Hycroft001",GEOGCS["GCS_North_American_1983",DATUM["D_North_American_1983",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Local"],PARAMETER["False_Easting",13264.924],PARAMETER["False_Northing",46473.418],PARAMETER["Scale_Factor",1.00025],PARAMETER["Azimuth",15.786],PARAMETER["Longitude_Of_Center",-116.7048269],PARAMETER["Latitude_Of_Center",42.88212865],UNIT["Foot_US",0.3048006096012192]]
Looking at their documentation, it seems to be this one:
https://desktop.arcgis.com/en/arcmap/latest/map/projections/local.htm
The biggest difference I see with the Orthographic from PROJ is the
Azimut parameter. I have the impression that the azimut is just a
rotation of the axes, but it is not clear to me in the Snyder book
(page 145. If you do not have it, it is available at
https://pubs.er.usgs.gov/publication/pp1395 )
Is there are alternative in PROJ?
Does it make sense to add this transformation?
Thanks
Javier
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