New answers tagged standards
For PostGIS' implementation, see these documents that describe the WKB formats for raster data. Similar is also documented here. There is no text equivalent for this data that I'm aware of, despite early naming of the effort as "WKTRaster". As for OGC, they retired their Grid Coverage Service standard which defined things like "WKBGeoTIFF".
Good question and not one I've really given thought to before. This might be the sort of thing you're interested in: Some searching show's that there's ISO19123:2005 - "Geographic information -- Schema for coverage geometry and functions" - needless to say, being an ISO standard it's decidedly not "Open" - they cost a small fortune to access - ...
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