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Where do you get the maps to make these?

The maps are generated directly from elevation data--all you need is an array of elevation values and the full maps are generated from those. A good source of elevation data for the USA is the National Map [1], but a much more comprehensive source is the SRTM Space Shuttle data [2] (it covers almost the entire earth at a 30m resolution).

[1] https://viewer.nationalmap.gov/basic/ [2] https://dwtkns.com/srtm30m/

Thanks! Follow up question: how do I zoom in once I have loaded in a GeoTIFF from one of those sources?

To zoom, just subset the matrix to the region of interest

Take a look at the AWS Elevation Tiles: https://registry.opendata.aws/terrain-tiles/

While at Mapzen (RIP), I helped generate these from a wide selection of open elevation data sources.

FYI Mapzen is coming back as a Linux foundation project (just announced in the last week):

https://hub.packtpub.com/mapzen-an-open-source-mapping-platf...

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