I have multiple files in XYZ format in UTM horizontal + WGS84 ellipsoid vertical that I need to convert to UTM horizontal EGM96 geoid elevations. There are about 250'000 points in a an area that is 3km on 25km approximately. The points mostly bathymetry points located 5cm to 1m from each other so sampling a raster DEM will not work.
Is there a way do that using gdal, python script, Qgis or Arcgis ?
What I found so far:
- The NGA's page where one can get EGM96 elevations from lat/long coordinates but that only works one point at a time.
- EPSG:10084 seems to provide transformation from WGS84 to EGM96 but I couldn't find how to use it.