This is more a question for @keflavich - I don't think we want one method per image type (imagine e.g. querying IRAS or Spitzer and having one method per band). It would make more sense to have:

```
get_image(self, coordinate, image_type, radius=None, ...)
```

and have ``image_type`` be one of ``ebv``, ``100um``, ``extinction``. We should aim to keep the number of methods down as much as possible. If we do this, the user shouldn't have to know about ``r``, ``e``, and ``t`` so one could use a dictionary to translate between human-readable ``image_type`` and the code for the query.