Visualization examples

[m-mohr]

In the recent workshop, people first tried to visalize data, but that wasn't very trvilal. Therefore we should ensure there's an easy way to visualize data. Multiple ideas come to mind:

1. Have an visualization example in the collection metadata
2. Have something like a view_collection process that can simply visualize data with some parameters to set.
3. Implement load_collection and save_result in a way that it can visualize without any further processes
4. ...?

[sinergise-anze]

Since part of every visualization should be a legend, I would like to suggest another idea:

4. it would be nice if the system could generate legends (images) directly from visualization metadata (that is: how the values translate to colors).

Not sure if it helps, but for examples on how legends are defined in Sentinel Hub see this page.

[m-mohr]

@sinergise-anze It seems like the STAC PR radiantearth/stac-spec#470 regarding visualization metadata would help a lot with the legends, but it is far from being finished.

[lforesta]

are we talking about visualization of all data in the cube_view specified in the process graph? This may be a lot, but maybe a back-end could retunr small previews with coarser resolution perhaps?

[m-mohr]

Nothing specifically. We are free to choose the best path to go. We could link to previews and/or have visualization defaults in the metadata that save_result can use and/or ...?

[m-mohr]

What I'll do here is to explicitly allow collection-level assets from STAC. This allows us to link to thumbnails or visualization process graphs from the collections. This is already possible through STAC extensions, but just not mentioned anywhere in the API.