# ZMap – ZMap Plus Grid

Driver short name

ZMAP

Driver built-in by default

This driver is built-in by default

Supported for read access and creation. This format is an ASCII interchange format for gridded data in an ASCII line format for transport and storage. It is commonly used in applications in the Oil and Gas Exploration field.

By default, files are interpreted and written according to the PIXEL_IS_AREA convention. If you define the ZMAP_PIXEL_IS_POINT configuration option to TRUE, the PIXEL_IS_POINT convention will be followed to interpret/write the file (the georeferenced values in the header of the file will then be considered as the coordinate of the center of the pixels). Note that in that case, GDAL will report the extent with its usual PIXEL_IS_AREA convention (the coordinates of the topleft corner as reported by GDAL will be a half-pixel at the top and left of the values that appear in the file).

Informal specification given in this GDAL-dev mailing list thread

NOTE: Implemented as `gdal/frmts/zmap/zmapdataset.cpp`.

## Driver capabilities

Supports CreateCopy()

This driver supports the `GDALDriver::CreateCopy()` operation

Supports Georeferencing

This driver supports georeferencing

Supports VirtualIO

This driver supports virtual I/O operations (/vsimem/, etc.)