The key folder where the asciidoc specification is developed is GeoTIFF_Standard cf. https://github.com/opengeospatial/geotiff/tree/master/GeoTIFF_Standard/standard Other files of interest are:
- geotiff_standard.html
- geotiff_standard.pdf
Other folders are just for traceability, capturing the works done between 2014 and 2018.