Working with QGIS 3.14 on Win 10, I try to define a custom CRS - I want to create an Orthographic projection centered on the Mediterranean - 35 N 20 E.
What I did: I copied the WKT-definition of North Pole Orthographic ESRI:102035 from the project properties CRS dialogue and than used this definition as starting point, pasted it in the custom CRS dialogue and changed the values from
PARAMETER["Latitude of natural origin",90,
and
PARAMETER["Longitude of natural origin",0,
to
PARAMETER["Latitude of natural origin",35,
and
PARAMETER["Longitude of natural origin",20,
So the changed WKT-definition looks like this:
PROJCRS["Mediterranean_Orthographic",
BASEGEOGCRS["WGS 84",
DATUM["World Geodetic System 1984",
ELLIPSOID["WGS 84",6378137,298.257223563,
LENGTHUNIT["metre",1]]],
PRIMEM["Greenwich",0,
ANGLEUNIT["Degree",0.0174532925199433]]],
CONVERSION["North_Pole_Orthographic",
METHOD["Orthographic",
ID["EPSG",9840]],
PARAMETER["Latitude of natural origin",35,
ANGLEUNIT["Degree",0.0174532925199433],
ID["EPSG",8801]],
PARAMETER["Longitude of natural origin",20,
ANGLEUNIT["Degree",0.0174532925199433],
ID["EPSG",8802]],
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)",east,
ORDER[1],
LENGTHUNIT["metre",1]],
AXIS["(N)",north,
ORDER[2],
LENGTHUNIT["metre",1]],
USAGE[
SCOPE["unknown"],
AREA["World - north of 0°N"],
BBOX[0,-180,90,180]],
ID["ESRI",102035]]
Proj4
+proj=ortho +lat_0=90 +lon_0=0 +x_0=0 +y_0=0 +datum=WGS84 +units=m +no_defs
Ausdehnung
-180.00, 0.00, 180.00, 90.00
Clicking the validate button, it tells me the defintion is valid. When I try to click OK to save the changes, an error message pops up:
PROJ-string ist equivalent to ESRI:102035
Please try to change the CRS-definition in WKT-format
Found this here, but it did not really help: Create new custom projections in QGIS 3.12?
How can I keep the original North_Pole_Orthographic (ESRI:102035) definition and add an additional one, just centered on another point?