[Seavox] SeaVox Salt and Fresh water body gazeteer (C19) proposal

[Moncoiffe, Gwenaelle]

Dear SeaVox and SDC-tech colleagues,
The description field in the SeaVox Salt and Fresh water body gazeteer (C19), contains the minimum and maximum latitudes and longitudes that forms the bounding box around a sea area. A bounding box is defined as the rectangle formed by the maximum lat/lon of the area of interest with its sides drawn parallel to the lines of longitude and latitude. While this is can be a useful and simple way to locate the extent of the sea area, it can result in areas that are much larger than the sea area itself.

In order to address this shortcoming, we are proposing to add the pair coordinates of the minimum area bounding box. This defines a rectangle around the area of interest that is not forced to be parallel to the lines of longitude and latitude.

The proposal is as follows:
#1 Keep the bounding box coordinates as they currently are;
#2 Add the minimum area bounding box (MABB) as coordinate pairs - this gives a rectangle around the sea area that does not have to be parallel to the lines of latitude/longitude
#3 Use geoJSON to structure the information

Below is our proposed geoJSON structure for the bounding box as min/max lat/lon and the minimum area bounding box as pair lat/lon coordinates:
{
        "type": "Feature",
        "bbox": [-10.0, -10.0, 10.0, 10.0],
        "geometry": {
                "type": "Polygon",
                "coordinates": [
                       [
                                [-10.0, -10.0],
                                [10.0, -10.0],
                                [10.0, 10.0],
                                [-10.0, 10.0],
                                [-10.0,-10.0]
                        ]
                ]
        }

}

Please let us know if you have any concerns, questions or suggestion to improve this proposal.
Kind regards
Gwen.


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