I need to export tiles from a WMTS server to the MBTiles format. The server is not public, but I have access to it and permission to export a specific portion of the tiles. The problem I have seems to come from the different projections:
- The WMTS server uses UTM zone 38N (EPSG:23038)
- The exported MBTiles needs to be in WGS84 spherical mercator (EPSG:3857)
What's the easiest approach to achieve this, and with which tools?
I already tried loading the WMTS source in QGIS and using QTiles. This works, but the resulting tiles are rendered poorly, I guess due to a sub-optimal reprojection algorithm.