Here I add an excerpt of the data I use for the tests, and this will keep us also on Github ;-)

You will find:
/data           =  the origin before processing with tiling scripts
/heightmaps     =  the new heightmaps with 0.1 deg, in all resolutions
/textures       =  equivalent textures without geo reference, but ready to go

This is all 1 degree N37/W122, to make some tests with LOD near KSFO (SF Bay)
Adding the tiling script. Sorry this does not follow TMS specs at the moment. It is just a tiling for getting further with LOD tests on threejs