Support for multipolygon geometries

[groundrace]

Multipolygons are largelly used for acipelag and country and regional borders but unfortunatelly are not supported by the extension. It seems SOLR have sypport for it already when using JTS

[amercader]

If you are using the solr-spatial-field backend for the spatial search, and your geometry is a valid MultiPolygon, the search should work just fine.

This extent works for me (by works I mean that the dataset is found on a spatial search):

{"type":"MultiPolygon", "coordinates": [[[[-62.637519836425774,17.09321364464215],[-62.637519836425774,17.20868918828472],[-62.537612915039055,17.20868918828472],[-62.537612915039055,17.09321364464215],[-62.637519836425774,17.09321364464215]]],[[[-62.87200927734374,17.214264312027566],[-62.87200927734374,17.41616680065724],[-62.60696411132812,17.41616680065724],[-62.60696411132812,17.214264312027566],[-62.87200927734374,17.214264312027566]]]]}

But not this one:

{"type":"MultiPolygon","coordinates":[[[[-62.89947509765625,17.197210463331256],[-62.89947509765625,17.42271835184761],[-62.589111328125,17.42271835184761],[-62.589111328125,17.197210463331256],[-62.89947509765625,17.197210463331256]]],[[[-62.65777587890625,17.06728740376787],[-62.65777587890625,17.219511333785114],[-62.51495361328124,17.219511333785114],[-62.51495361328124,17.06728740376787],[-62.65777587890625,17.06728740376787]]] ]}

Note that on the second one the polygons are overlapping. This is flagged as an invalid geometry by shapely, the library that we use to validate them:

WARNI [shapely.geos] Self-intersection at or near point -62.589111328125 17.219511333785114

(The proper way to go in this case would probably be a GeometryCollection with two Polygon objects but that is not supported in CKAN) If I bypass the validation for this particular case, Solr indexes the geometry just fine and the dataset is found on a spatial search. I'd need to investigate a bit more to see if we can add an exception for this particular case.

[groundrace]

that would be nice as I got the same error for the overlapping geometries that reflect my case i.e (Vatican City or San Marino part of the Italy borders are a shapes not overlapping but even contained into the main one).

[ChristianF88]

Hi everyone, has there been any progress on this? What is the current recommended workaround when migrating from PostGIS, where overlapping Multipolygons worked correctly, to newer versions of CKAN without PostGIS? Thanks!