[PROJ] Esri "local" projection

[Noel Zinn]

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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