Add arbitrary rotation at the same time as projection

[dansand]

I have a situation where I want to take geographic features and use these as an input for numerical modelling. The modelling is cartesian, so I need to project the coordinates. At the same time, it is often useful to apply a rotation of the coordinate system, as it can help to make more natural model boundary conditions.

Is there any way I can add a rotation to a projection, so that I can call my point transformation (rotation/projection) in a single step?

Thanks

Dan

[micahcochran]

I'll be up front, I don't know much about this. I ran across a tilted perspective projection in PROJ.4, which is interesting.

I assume the usual way to deal with this is to rotate the "map canvas" during rendering.

matplotlib has some transformation matrix functions, but I can't be of any further help with that.

[georgeouzou]

A little late but here goes: use the library Shapely (it contains an affine transformation module) in conjunction with the wanted projection to transform your features (It works well with pyproj library).Read more here. Check shapely.ops.transform and shapely.affinity.rotate

[snowman2]

This may also lead to a solution: https://pyproj4.github.io/pyproj/html/api/transformer.html#pyproj.transformer.Transformer.from_pipeline

[snowman2]

Closing as this thread due to inactivity. Feel free to reopen if you have any questions. Thanks!