Show HN: Map of California SNO-Parks with current snow depth data

I was looking for a way to quickly overlay geo data (e.g. current snow depth https://www.fs.usda.gov/sites/nfs/files/r05/publication/R5_S...) on top of a map of points of interest, and couldn't find anything straightforward. This proof-of-concept allows for an example workflow of exporting points of interest from Google Maps (either public or your own creation) as KML files, and plotting this data against arbitrary data in GeoJSON format.

In the motivating example, the main challenge was in converting the raw snow depth data into the proper format, for which I've included some sample adapter code. Sharing this here in case anyone finds it useful for upcoming weekend trips, has recommendations for different tools to solve the same problem, or suggestions for improvement!