Land-sea limit - Metropolitan France

The land-sea limit corresponds to the Highest Astronomical Tide (HAT) in the case of a tide of coefficient 120 and under normal meteorological conditions (no offshore wind and mean atmospheric pressure of 1013 hPa). This geometric line is naturally defined as the intersection of a HAT model (extended to the coast and the top end of the upper estuary) based on the available Bathyelli surfaces, and a high-resolution digital terrain model of the coastal area. It corresponds to the highest limit of the intertidal area and takes into account, when they exist, the 3 administrative maritime limits which are: the transversal limit of the sea (LTM), the salt water limit (LSE) and the limit of maritime jurisdiction (LAM). This limit is measured (quoted) in relation to the local hydrographic chart datum and to the levels of reference for France (IGN69 and IGN78 for Corsica). Relations to other levels of reference (mean sea level and ellipsoid) are known. The land-sea limit product, mainly results from the exploitation of the two products Litto3D®/RGEALTI® and Bathyelli, and represents, with a metric resolution (1 to 5 metres), this theoretical entity by a set of 2D polylines describing the nature of the coast (artificial or natural, rocky or sandy, steep or flat, etc.). The method used for calculating the land-sea limit makes it possible to produce a continuous, homogeneous and spatially coherent limit on the entire French metropolitan coastal area.

Data and Resources

Additional Info

Field Value
Original title
Original abstract
Topic category
  • maritime_boundaries
Sub category Physiographic boundaries
Resource language English
Domain area
  • french_part_of_the_mediterranean_sea
Owner Shom
Provider Shom
Data portal data.shom.fr
Presentation form Map (map represented in raster or vector form)
Spatial representation Vector - line (or polyline)
Coordinate reference system
    4258,2154
    Web services
    • OGC-WMS
    • OGC-WFS
    Derives from
    Derived datasets
    Successor of
    Predecessor of
    Temporal extent
    Spatial extent
    Data accessibility Data is accessible and downloadable from Shom geoportal https://data.shom.fr
    Validation level Official data
    Additional information
    Metadata completeness
    Notes

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