Improve Mosaic gridding

[ljlamarche]

Currently, mosaic images are found by interpolating raw image files to a common, regular geodetic latitude/longitude grid. This is slow, and can create some distortion effects because the grid is not evenly spaced. Investigate ways of improving this algorithm.

• Don't interpolate at all, use the original positions and find another way to determine camera hiarchy in the mosaic image
• Make the grid easily adaptable instead of hard-coded
• Try using HEALPix (https://healpix.sourceforge.io/) for a grid that's more regularly spaced

[ljlamarche]

Creating/plotting mosaics is very memory intensive. From CEDAR Python session, some things to investigate to improve this:

• xarray
• Kamodo/Dask
• geoviews