Allow per-dataset viewer parameters

[gadomski]

Some stac-geoparquet datasets, especially around the poles, might want to load stac-map in globe mode (instead of mercator): englacial/xopr#64 (comment). I plan on adding pick-your-projection support via url parameters to stac-map in developmentseed/stac-map#333, but full support will require source.coop to append a projection=globe URL parameter to the iframe src attribute. I'm not familiar with the dataset metadata model, but does it seems reasonable to add some sort of "viewer config" where @espg could specify that a given dataset should be loaded with a globe projection?

I've thought a bit about whether stac-map can auto-detect the best projection, and maybe that's possible down the road, but it seems pretty tricky.

[espg]

I've thought a bit about whether stac-map can auto-detect the best projection, and maybe that's possible down the road, but it seems pretty tricky.

To be utterly and transparently honest here-- I sort of feel like globe mode should just be the default since it will work everywhere, and Mercator should be the fallback via a urlParam. The viewer you have already does snap viewing based on the geoparquet bounding box... so I feel like for most datasets (once the auto zoom kicks in), users won't be able to tell that the globe view isn't the Mercator...

[gadomski]

One downside of globe-as-default is that asset rending via deck.gl-raster only works in Mercator, at the moment.