Prototype image overlay for sentinel 2 and landsat images

This task is to prototype image overlays using sentinel 2 and landsat 8 thumbnails. The goal here is to see how difficult it is using information we already have, if there is information available (e.g. tile footprint vs data footprints) that we can use to make this possible.

The output of this should be a simple index.html page with an accompanying index.js and any other required assets that can be served via a simple fileserver to show thumbnails on the map.

[ddohler]

I played around with Sentinel2 on the example a bit and noticed a couple further things:

1. The Sentinel2 images are in UTM, which means that we will need to ingest or determine the UTM zone of the thumbnail and provide it to the frontend in order to transform the coordinates, because the zone will be different depending on what part of the world the scene is from.
2. At least with Sentinel2, there seem to be mismatches between the thumbnails and map tiles as you get further from the equator, see below (for reference, this is http://sentinel-s2-l1c.s3-website.eu-central-1.amazonaws.com/#tiles/19/V/EF/2016/8/2/0/ and it is from Ungava Bay which is in the northern part of Newfoundland and Labrador):

[jisantuc]

On the landsat tiles, the .MTL metadat file had both lat/lon and some other coordinate system available, so I opted to send lat/lon. @Lknechtli had already demonstrated reprojecting before displaying on the Sentinel-2 data, so I picked the easier numbers to find and deal with.