I am looking at an old map (the 1975 layer) and they only have three parameters for their projection:
- Projection: Rectified Skew Orthomorphic (Metric Grid)
- Spheroid: Everest
- Origin: 4.00 N, 102.25 E
I've been trying to make a custom
proj4-string in QGIS 3.4 but it keeps returning that it's invalid.
Here's the string:
+proj=omerc +lat_0=4.0 +lon_0=102.25 +ellps=evrst69 +units=m +no_defs
Does anyone know what else I'm missing to make the string a valid projection?
There isn't much else on the map, unless there actually is something on the map that I'm completely missing.
For future reference, what are the things that I need to look out for from old maps such as the one in the link above to try and make the custom