How to handle GeoJSON in other projections

[MortenHofft]

The UI state that you can use GeoJSON to filtering. But it doesn't say anything about the projection or datum. We should either convert projection or state the requirements

GeoJSON example

{
  "type" : "FeatureCollection",
  "crs" : {
    "type" : "name",
    "properties" : {
      "name" : "EPSG:28992"
    }
  },
  "features" : [
    {
      "type" : "Feature",
      "id" : 1,
      "geometry" : {
        "type" : "Polygon",
        "coordinates" : [
          [
            [
              67145.844999998808,
              439344.6640000008
            ],
            [
              57669,
              436777
            ],
            [
              56195.710000000894,
              430025.01000000164
            ],
            [
              37445.050000000745,
              417475.78000000119
            ],
            [
              32106.561999998987,
              408335.49599999934
            ],
            [
              41623.671000000089,
              408107.78799999878
            ],
            [
              38659.63599999994,
              402433.07699999958
            ],
            [
              62781.127999998629,
              403489.25299999863
            ],
            [
              67796.440000001341,
              408443.07999999821
            ],
            [
              84282.999000001699,
              408916
            ],
            [
              73669.88599999994,
              422802.06399999931
            ],
            [
              62151.579999998212,
              429029.92199999839
            ],
            [
              70456.370000001043,
              433370.8599999994
            ],
            [
              67145.844999998808,
              439344.6640000008
            ]
          ]
        ]
      },
      "properties" : {
        "OBJECTID" : 1,
        "Code" : 614,
        "Gemeentenaam" : "Schouwen",
        "Gemeentecode" : "GM0614",
        "Shape_Length" : 160258.67940965926,
        "Shape_Area" : 945140599.14390874,
        "InPoly_FID" : 1,
        "SimPgnFlag" : 0,
        "MaxSimpTol" : 5000,
        "MinSimpTol" : 5000
      }
    }
  ]
}

[MortenHofft]

Apparently I've answered this in the past. CRS seems no longer supported in GeoJSON https://github.com/gbif/portal-feedback/issues/1906

As a service we could detect if it was provided and tell the user it isn't supported. We could also update the help text to state that it has to be wgs84