GTX — NOAA Vertical Datum Grid Shift
Driver short name
GTX
Driver built-in by default
This driver is built-in by default
The GTX format is used to store vertical datum grid shift grids, typically distributed by NOAA. These grids have been used historically by PROJ, until PROJ 7.0 where GeoTIFF-based grids have been introduced and are now the preferred way to convey geoid models.
Driver capabilities
Read-only
Raster
Supports CreateCopy()
This driver supports the GDALDriver::CreateCopy() operation
Supports Create()
This driver supports the GDALDriver::Create() operation
Supports Georeferencing
This driver supports georeferencing
Supports VirtualIO
This driver supports virtual I/O operations (/vsimem/, etc.)
File format
GTX files are binary raster grids containing vertical offset values. They are commonly used in conjunction with coordinate reference systems that include vertical components.