Re: [Qgis-user] Missing lunar CRS

info Mon, 31 Aug 2020 09:54:16 -0700

Curt,

You're right, they have disappeared somtime after 3.10.

Perhaps the following definitions will help you create custom crs's:

Moon South Pole Stereographic: IAU2000:30120

WKT

PROJCRS["unknown",
    BASEGEOGCRS["unknown",
        DATUM["unknown",
            ELLIPSOID["unknown",1737400,0,
                LENGTHUNIT["metre",1,
                    ID["EPSG",9001]]]],
        PRIMEM["Reference meridian",0,
            ANGLEUNIT["degree",0.0174532925199433,
                ID["EPSG",9122]]]],
    CONVERSION["unknown",
        METHOD["Polar Stereographic (variant A)",
            ID["EPSG",9810]],
        PARAMETER["Latitude of natural origin",-90,
            ANGLEUNIT["degree",0.0174532925199433],
            ID["EPSG",8801]],
        PARAMETER["Longitude of natural origin",0,
            ANGLEUNIT["degree",0.0174532925199433],
            ID["EPSG",8802]],
        PARAMETER["Scale factor at natural origin",1,
            SCALEUNIT["unity",1],
            ID["EPSG",8805]],
        PARAMETER["False easting",0,
            LENGTHUNIT["metre",1],
            ID["EPSG",8806]],
        PARAMETER["False northing",0,
            LENGTHUNIT["metre",1],
            ID["EPSG",8807]]],
    CS[Cartesian,2],
        AXIS["(E)",north,
            MERIDIAN[90,
                ANGLEUNIT["degree",0.0174532925199433,
                    ID["EPSG",9122]]],
            ORDER[1],
            LENGTHUNIT["metre",1,
                ID["EPSG",9001]]],
        AXIS["(N)",north,
            MERIDIAN[0,
                ANGLEUNIT["degree",0.0174532925199433,
                    ID["EPSG",9122]]],
            ORDER[2],
            LENGTHUNIT["metre",1,
                ID["EPSG",9001]]]]

Proj4

+proj=stere +lat_0=-90 +lon_0=0 +k=1 +x_0=0 +y_0=0 +a=1737400 +b=1737400 +units=m +no_defs

Moon North Pole Stereographic: IAU2000:30118

WKT

PROJCRS["unknown",
    BASEGEOGCRS["unknown",
        DATUM["unknown",
            ELLIPSOID["unknown",1737400,0,
                LENGTHUNIT["metre",1,
                    ID["EPSG",9001]]]],
        PRIMEM["Reference meridian",0,
            ANGLEUNIT["degree",0.0174532925199433,
                ID["EPSG",9122]]]],
    CONVERSION["unknown",
        METHOD["Polar Stereographic (variant A)",
            ID["EPSG",9810]],
        PARAMETER["Latitude of natural origin",90,
            ANGLEUNIT["degree",0.0174532925199433],
            ID["EPSG",8801]],
        PARAMETER["Longitude of natural origin",0,
            ANGLEUNIT["degree",0.0174532925199433],
            ID["EPSG",8802]],
        PARAMETER["Scale factor at natural origin",1,
            SCALEUNIT["unity",1],
            ID["EPSG",8805]],
        PARAMETER["False easting",0,
            LENGTHUNIT["metre",1],
            ID["EPSG",8806]],
        PARAMETER["False northing",0,
            LENGTHUNIT["metre",1],
            ID["EPSG",8807]]],
    CS[Cartesian,2],
        AXIS["(E)",south,
            MERIDIAN[90,
                ANGLEUNIT["degree",0.0174532925199433,
                    ID["EPSG",9122]]],
            ORDER[1],
            LENGTHUNIT["metre",1,
                ID["EPSG",9001]]],
        AXIS["(N)",south,
            MERIDIAN[180,
                ANGLEUNIT["degree",0.0174532925199433,
                    ID["EPSG",9122]]],
            ORDER[2],
            LENGTHUNIT["metre",1,
                ID["EPSG",9001]]]]

Proj4

+proj=stere +lat_0=90 +lon_0=0 +k=1 +x_0=0 +y_0=0 +a=1737400 +b=1737400 +units=m +no_defs

Moon 2000: IAU2000:30100

WKT

GEOGCRS["unknown",
    DATUM["unknown",
        ELLIPSOID["unknown",1737400,0,
            LENGTHUNIT["metre",1,
                ID["EPSG",9001]]]],
    PRIMEM["Reference meridian",0,
        ANGLEUNIT["degree",0.0174532925199433,
            ID["EPSG",9122]]],
    CS[ellipsoidal,2],
        AXIS["longitude",east,
            ORDER[1],
            ANGLEUNIT["degree",0.0174532925199433,
                ID["EPSG",9122]]],
        AXIS["latitude",north,
            ORDER[2],
            ANGLEUNIT["degree",0.0174532925199433,
                ID["EPSG",9122]]]]

Proj4

+proj=longlat +a=1737400 +b=1737400 +no_defs

In Settings -> Custom Projections... window, use only WKT or Proj4 from above to define the projection, depending on the selected "Format" value.

Hope this helps!

Regards,
Benoit

On 31/08/2020 18:38, Schroeder, Curtis M. wrote:

Hi Benoit,

Thanks for the quick reply, but I am not seeing this in QGIS 3.14. I only see one projection: GCS_Moon_2000 (ESRI: 104903).

Kind regards,

Curt

From: info <[email protected]>
Sent: Monday, August 31, 2020 12:31 PM
To: Schroeder, Curtis M. <[email protected]>; QGIS- USER <[email protected]>
Subject: Re: [Qgis-user] Missing lunar CRS

Hi Curt,

In QGIS 3.10 all three projections are there...
In the CRS window, in the filter box type moon and it will show at least 5 projections related to the Moon, including the three you are missing.

Just reassign them to your layers.

Regards,
Benoit

On 31/08/2020 18:05, Schroeder, Curtis M. wrote:
Last year I was working on lunar terrain data using QGIS 3.8. Subsequent 
releases (3.10, 3.12, 3.14) reported CRS errors when I tried to work with the 
same data and projects.
 
I have found the lunar CRS I was using in v3.8.x are missing from v3.14.1. The 
missing CRS impacting my work are:
 
* Moon 2000 (IAU2000:30100)
 
* Moon North Pole Stereographic (IAU2000: 30118)
 
* Moon South Pole Stereographic (IAU2000: 30120)
 
Why were these removed from QGIS and how can they be added back in?
 
Kind regards,
 
Curt
 
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