The association of X and Y with latitude and longitude is a complicated and difficult topic. Here's a good article about the issue.
https://wiki.osgeo.org/wiki/Axis_Order_Confusion Here's a summary and recap as I see it. Geodesy uses a left-hand mathematical coordinate system so that the lat,lon,height coordinate tuple order is X,Y,Z. This causes mental distress for many in other disciplines, so they say the mathematical coordinate system is right-handed and the coordinate tuple order is Y,X,Z. CF has followed the latter convention for latitude and longitude in terms of the association of the names X, Y, and Z with coordinates. Since we don't, in general, compose coordinate tuples in CF usage, we avoid part of the problem. OGC WKT specifies the order of coordinates in a CRS but doesn't assign X, Y, Z labels. It also allows each coordinate to specify positive direction. The handedness of the mathematical coordinate system is determined by inspection of order and positive direction. CF doesn't specify anything about the order or positive direction of coordinates in our **`grid_mapping`** specifications. We leave the user to determine the correct composition of coordinate tuples for use in CRS transformations. Full automation of CRS transformations using a WKT CRS string is not possible because there are too many unknowns. In practical terms, some combination of the axis attribute and standard_name attribute values is sufficient to automate most cases. -- You are receiving this because you are subscribed to this thread. Reply to this email directly or view it on GitHub: https://github.com/cf-convention/cf-conventions/issues/247#issuecomment-595394154 This list forwards relevant notifications from Github. It is distinct from [email protected], although if you do nothing, a subscription to the UCAR list will result in a subscription to this list. To unsubscribe from this list only, send a message to [email protected].
