Geographic Information Systems Asked by Michael Smith on December 28, 2020
I’ve generated a GeoJSON file using ogr2ogr from an ESRI Shapefile for UK Protected Wrecks provided by Historic England – the standard format for the outputted GeoJSON is:
{
"type":"Feature",
"properties":{
"ListEntry":1000043,
"Name":"HMS/m A1",
"DesigDate":"1998-11-04",
"LegacyUID":"911782",
"SInumber":"1998/2708n2004/2395",
"AmendDate":"2004-10-05",
"Latitude":50.74251829,
"Longitude":-0.92132,
"Easting":476206.35448699998,
"Northing":94211.245704100002,
"AREA_HA":28.238722280800001,
"Hyperlink":"https://historicengland.org.uk/listing/the-list/list-entry/1000043"
},
"geometry":{
"type":"Polygon",
"coordinates":[
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}
},
I want to store the data in MongoDB to work with MongoDB GeoSpatial queries – I’m interested in performing queries against the Latitude and Longitude in the "properties" key of the GeoJSON entry so I’m considering adding a Point to the GeoJSON data.
As it’s my data store I can sort of fudge the data to make it work but I’m curious – can a Point and a Polygon be added to a single GeoJSON feature entry? My reading of RFC 7946 (Section 3.1) seems to indicate that you can’t add both a Point and a Polygon to a single entry and you’d effectively need to duplicate the entry if you wanted both items stored as geometries.
You can use a GeometryCollection as stated in the specs e.g https://tools.ietf.org/html/rfc7946#section-3.1.8
You can find in the same spec in the appendix an example e.g https://tools.ietf.org/html/rfc7946#appendix-A.7 or a more complete sample at https://github.com/openlayers/openlayers/issues/8873
Correct answer by ThomasG77 on December 28, 2020
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