Submission of bathymetric data and metadata

Instructions for submission og bathymetric data and metadata to the Danish Geodata Agency (henceforth DHA).

The DGA encourages communication during any stage of the survey. If you have any questions regarding the submission, you are welcome to contact us at dybdedataforvaltning@gst.dk. We recommend you compile the information and metadata as early as possible and bring this document on board during the survey,

Requirements for data submission:

  • The submitted meterial must fully describe the acquisition, processing and quality control of the submitted survey.
  • If an IHO S-44 Order is assigned to the submitted survey, supporting documentation and analysis must be provided.
  • The full bathymetric dataset must be thoroughly cleaned for spikes and corrected for water level effects before submitted.
  • For each survey line, data must be submitted as a cleaned point cloud, i.e. not gridded data, in survey data format, e.g. .fau or .gsf - alternatively ascii text (e.g. x, y, z).
  • A polygon covering the survey must be provided. Geopackage or shapefile is preferable. 
  • If ancilliary data has been collected during the survey, e.g. sound velocity profile and tide measurements, these must also be submitted. The survey report should describe how these have been applied. 
  • If objects or depths are identified as dangerous to navigation ad are less than the depth stated on the navigational chart, the Maritime Assistance Centre (mas@sok.dk) and the Danish Geodaata Agency (soeopmaalingstilladelser@gst.dk) must be notified immediately. Note the position(s) and information in the table at the bottom of the form "Identified significant features/dangers to navigation".

Instructions for submission of bathymetric data and metadata

For coordinate reference systems, the DGA refers to the official reference frames.

For Denmark, the following horizontal datum and coordinate reference systems (CRS) are preferred:

  • ETRS89 UTM32N (EPSG:25832) or ETRS89 UTM33N (EPSG:25833).

In the Baltic Sea and Kattegat, the preferred vertical datums are: 

  • DVR90(2023) (ESPG:10485) or BSCD2000 (EPSG:10678)

In the North Sea, the preferred vertical datum is: 

  • DKLAT(2023) (ESPG:10550)

For Greenland, the following horizontal datum and CRS are preferred:

  • GR96 UTM18N to GR96 UTM28N (EPSG:3178-EPSG:3188).

For Greenland, the preferred vertical datum is:

  • GLLAT(2025) (EPSG:11450)

Models for all mentioned vertical datums can be found on Klimadatastyrelsens (The Danish Agency for Climate Data) public FTP server: ftp.sdfe.dk/TransformationsGrids

Data may be submitted by contacting us at dybdedataforvaltning@gst.dk for an upload link.

In case you wish the bathymetric data to be eligible for charts, please contact us at dybdedataforvaltning@gst.dk for the current requirements. 

In summary, the submission must include:

  • Survey reports and supporting documentation.
  • For each syrvey lin a cleaned point cloud.
    • Optional: Any gridded product.
    • Optional: The unprocessed Acquisition sensor files (raw files).
  • Ancillary data e.g. tide, sound, velocity etc.
  • A clear description of the vertical datum used in the survey must be submitted. In the case of the survey relying on a costum datum, a model realizing this datum must be submitted along with the other files.
  • Filled metadata tables.
  • A survey polygon.