# S104 -- S-104 Water Level Information for Surface Navigation Product

Driver short name

S104

Build dependencies

libhdf5

New in version 3.9.

This driver provides read-only support for water level data in the S-104 format, which is a specific product profile in an HDF5 file.

S-104 files have two image bands representing water level height (band 1) and water level trend (band 2) values for each cell in a raster grid area.

When opening a S-104 file, no raster band is directly available. But a list of subdatasets will be reported, one for each timestamp available in the file.

An actual dataset can be opened through such a subdataset, with a syntax like `S104:"filename.h5":Group_001`.

Georeferencing is reported.

Note that the driver currently only supports regularly gridded S104 datasets.

## Driver capabilities

Supports Georeferencing

This driver supports georeferencing

Supports VirtualIO

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

## Open options

- NORTH_UP=[YES/NO]: Defaults to `YES`. Whether the top line of the dataset should be the northern-most one.

  This is the default behavior of most GDAL formats, but the native organization of the data in S-104 products is to have the first line of the grid being the southern-most one. This native organization can be exposed by the driver by setting this option to NO (in which case the 6th term of the geotransform matrix will be positive)

## See Also

- Implemented as s104dataset.cpp.

- S-104 Bathymetric Surface Product Specification

- BAG driver

- S-102 driver

- S-111 driver