Alvaro Huarte

Do you have defined the `Content-Encoding: gzip` content negotiation header? https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Encoding

Yes, my tiles are very small too. I attach a fragment of my tile set, from 0 to 6th level - [qm.zip](https://github.com/geo-data/cesium-terrain-builder/files/2867301/qm.zip) . It is located in N42°49'0.73" - O1°38'35.63"...

You could use [gdalbuildvrt](https://www.gdal.org/gdalbuildvrt.html) for creating a virtual raster file without really to save a new big tif.

Sorry, CTB tool does not support the water mask creation for any output format. You can read it in the [limitations-TODO](https://github.com/geo-data/cesium-terrain-builder#limitations-and-todo) section in Readme page.

You could use `gdal_translate` tool with the `a_srs` parameter.

You can use the [gdal_edit](https://gdal.org/programs/gdal_edit.html) tool to set the spatial reference system of your input raster files (Geotiff, ecw....) before creating the tile cache with CTB

Thanks @bjpirt , my apologies to everybody, I wasn't able to reopen the original PR #55 to keep saved all comments already written

Thanks @LHolst for the feedback! I will add the "extensions" entry.

Thanks @LHolst for your feedback and advices! About flipping normals in that copied missing root tile, it needs some more of work

Hi @LHolst, finally I have changed how CTB creates the missing root tile, now it is created from a temporary empty elevation that spatially overlaps the missing tile. I hope...