[PROJ] Understanding dropped parameters for stere and latlong

[Martin Desruisseaux]

Why not using PRIMEM, for example like below?

    GEODCRS["WGS 84 (anti-meridian)",
       DATUM["World Geodetic System 1984",
         ELLIPSOID["WGS 84", 6378137, 298.257223563, LENGTHUNIT["metre",1.0]]],
       PRIMEM["Anti-meridian", 180, ANGLEUNIT["degree",0.01745329252]],
       CS[ellipsoidal,2],
         AXIS["latitude",north,ORDER[1]],
         AXIS["longitude",east,ORDER[2]],
         ANGLEUNIT["degree",0.01745329252]]

It should create a CRS with longitude in -180 to 180° range, but where 
0° is at 180° from Greenwich (I not sure if this is what you wanted).

Martin


Le 12/04/2020 à 23:53, David Hoese a écrit :

> >There's no way in standard WKT to express a longitude of origin != 0 
> for a GeographicCRS. If you export to WKT1_GDAL, a EXTENSION[] node 
> captures this however. Or if you re-export back to PROJ string the CRS 
> object built from "+proj=latlong +lon_0=45", you'll get back the 
> original string.
>
> So if I use WKT2 as my standard in-memory/serialized version of a CRS, 
> is there any standard way to handle a geotiff that goes over the 
> anti-meridian (-180/180)? In the past I've played around with `+over` 
> or changing with `+lon_0=X`, but those won't work here it seems.
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