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Ground Level (VDT_6)
DGIF baseline 2026-1, the latest. Earlier baselines: timemap.
RDF: vdt_6.ttl
- Name
groundLevel- Attribute
- VDT Vertical Datum
- Definition
- A continuous surface over dry land and non-tidal waters (for example: lakes).
- Description
- In the case of non-tidal waters it is necessary to specify hydrologic conditions in order to ensure a precise reference surface specification. Over extensive areas it is often defined by a digital elevation model (for example: a matrix of elevation values or a Triangulated Irregular Network (TIN)). Over tidal waters (for example: oceans) it is usually considered to be extended to cover the remainder of the world based on a Mean Sea Level (MSL) surface.
- Accepted
- 2013-10-18
- Defined by
- DFDD BL2013-1.00
Source: DGIF 2026-1 QEA model, DGIWG. Standard: DGIWG 206-3. Licence: CC BY 4.0, © DGIWG.