The GeoSym symbology offers support for the visualization of the Digital Nautical Chart (DNC) product, which is a VPF-based alternative for the ECDIS S-57/S-52 hydrographic displaying system. In the symbolization of certain hydrographic features on ECDIS systems, the representation of symbols varies based on attributes that are not present within the VPF data structure. To cover those variations, global attributes called "ECDIS external attributes" were defined, in addition to the attributes found in each VPF feature.
You can set the values for those attributes through the API, using the TLcdVPFGeoSymDefaults
class.
The following table gives an overview of the ECDIS attributes and their usage. A full description
of the attributes can be found in the DoD military handbook MIL-HDBK-857, 17 June 2004, paragraph 6.4.1.1.
Attribute | Description | Configuration | Default value |
---|---|---|---|
ISDM |
Interactive Shallow Display Mode |
|
1 |
IDSM |
Interactive Display Selection Mode |
|
0 |
SSDC |
Ship’s Safety Depth Contour |
|
50 |
MSDC |
Mariner Specified Deep Contour |
|
100 |
MSSC |
Mariner Sepecified Shallow Contour |
|
10 |