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

Mon Oct 14 07:19:51 BST 2019

Dear Adam,
Thank you for your feedback. No we haven't looked at alternatives. Our primary objective was mainly to provide one additional well-used type of bounding box. It would be good to discuss this further when we meet next week and get a feel for what the C19 user community would like to see.
Kind regards,
Gwen.

From: Adam Leadbetter <Adam.Leadbetter at Marine.ie>
Sent: 11 October 2019 09:18
To: Moncoiffe, Gwenaelle <gmon at bodc.ac.uk>; seavox at mailman.nerc-liv.ac.uk; sdc-tech at seadatanet.org
Subject: RE: SeaVox Salt and Fresh water body gazeteer (C19) proposal

Dear Gwen

This sounds like an excellent step forward for the C19 vocabulary.

I am curious if you did any investigation as to alternative encodings to GeoJSON, such as using a snippet of JSON-LD and, e.g. the GeoSPARQL vocabulary, or Schema.org? I'm asking as I know there were some issues with converting GeoJSON to Linked Data - although these may have been resolved now. If the NVS will be able to handle direct RDF output of the descriptions soon then it is a moot point, but it would be nice to have a fully machine readable instance of this information.

I appreciate that this might be at odds with your use case if the intent is to easily add the minimum bounding box of a sea area to, say, a Leaflet map on a web page so maybe it needs a bit of thought.

Happy to discuss this further off the list and work through some examples if it helps.

Adam

From: sdc-tech-request at listes.seadatanet.org<mailto:sdc-tech-request at listes.seadatanet.org> [mailto:sdc-tech-request at listes.seadatanet.org] On Behalf Of Moncoiffe, Gwenaelle
Sent: Friday 11 October 2019 08:45
To: seavox at mailman.nerc-liv.ac.uk<mailto:seavox at mailman.nerc-liv.ac.uk>; sdc-tech at seadatanet.org<mailto:sdc-tech at seadatanet.org>
Subject: [sdc-tech] SeaVox Salt and Fresh water body gazeteer (C19) proposal

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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