Update the Collection extent to be a 2d array to match the specification

[CoryBianco]

I am testing with the OGCFeatureLayer from arcgis Core v4.30.9 and noticed that I was unable to get the features to display on the map. After looking through their library, they are expecting the bbox to be a 2d array. Thus when it tries to pull the bbox and sees that it is a 1d array, it tries to access a float and then errors out.

I updated the type of extent to be a 2d array instead of a 1d array and put the same

Code from the OGCFeatureLayer in arcgis Core v4.30.9

function K(e2) {
  var _a;
  const t = (_a = e2.extent) == null ? void 0 : _a.spatial;
  if (!t) return null;
  const n2 = t.bbox[0], i3 = 4 === n2.length, [r, o2] = n2, s2 = i3 ? void 0 : n2[2];
  return { xmin: r, ymin: o2, xmax: i3 ? n2[2] : n2[3], ymax: i3 ? n2[3] : n2[4], zmin: s2, zmax: i3 ? void 0 : n2[5], spatialReference: f.WGS84.toJSON() };
}

[CoryBianco]

@dr-jts Hey there! I was curious if you had seen any issue like this before?

[dr-jts]

Hey there! I was curious if you had seen any issue like this before?

No. But I don't use ArcGIS.

Is this valid according to the OGC spec?

[dr-jts]

This does look like it's not implemented according to the OGC Features specification. The definition of theextent property in the JSON for collections is:

• YAML specification of extent
• Example of Collection JSON

The definition allows multiple extents to be provided for a collection, with the first one being the overall extent (which allows systems to choose to read just one extent). (OGC Features Core issue 518 discusses this.) pg_featureserv only outputs a single extent.

It's very surprising this bug hasn't turned up until now!

Is this really all the changes needed to fix this? Does the UI still work?

[CoryBianco]

This does look like it's not implemented according to the OGC Features specification. The definition of theextent property in collections is:

• YAML specification of extent
• Example of Collection JSON

It's very surprising it hasn't turned up until now!

Is this really all the changes needed to fix this? Does the UI still work?

The UI actually did not work with it in a 1D array but it did work in a 2D array

just a pic of it working with the 2D array

[dr-jts]

Also added a test to confirm the Extent structure: cd3ae95