DanRyanIrish

@CyclingNinja, I merged other PRs that have been merged since this was opened appear to have introduced issues here. I merged the map_ndcube_migration branch into this one on GitHub, which...

The decision taken on the sunpy call is to solve this issue by introducing a `keepdims` kwarg to `NDCubeBase.crop` and then setting this to `True` inside `Map.submap`. See https://github.com/sunpy/ndcube/issues/714 for...

@hayesla : https://github.com/sunpy/ndcube/issues/714 has been merged. So you can now finish this PR by using the `keepdims` kwarg of `NDCube.crop`.

Hi @nabobalis . Have you taken over this PR?