I don't have houdini but I am trying to edit those maps that were made in houdini, I use other softwares and I also have g projector from Nasa but does't features dual paraboloid seems, I am not expert with blender. In general this is not related to a model I only have the texture map and I wanted to make an alternative…
Out of houdini , what projection is that and how can I do to convert to equirectangular? I did manually , but if I can find a more automated process would be nice... https://i.ibb.co/bFv1XVT/gagarinheightmap.png
I’m going to guess… yes. But what software are you using? Houdini likely can do this. Substance Designer probably too. Blender could also, if you bake from a dual-paraboloid uv layout into an equirectangular one.