Multipolygon is not creating correct geojson object

[jstone-ponderosa]

When I create a multipolygon, it is not creating all of the polygons. For the example wkt below, it creates two polygons, not the third. This is happening on all of my multi polygons and they are all valid wkt.

Any help?

Geography WKT:
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[Siliconrob]

I have the same problem, I just cut around the problem by splitting my multipolygon into and array of polygons. If this gets fixed it would be great.

[lvigdorov]

Siliconrob, I'm facing the same issue with multipolygons and wondering how did you get away with splitting into single polygons, did you combine them all into a collection to serialize a single geojson? I was trying this approach by creating a feature inside of the foreach polygon, adding it to a FeatureCollection and then serializing the collection. This will however generate an invalid geojson. Any advice is greatly appreciated.

[Siliconrob]

I don't know if I can help you much with geojson. I split the the multi polygon in the database layer using spatial functions to take each polygon in the multi polygon and then return an array of polygons which then serialized into valid geojson.

[lvigdorov]

Thanks for the quick response, I'm using pretty much the same approach but from the code. Did you use Terradue.GeoJson to convert the SqlGeometry into their array type and serialize via JsonConvert? Would you mind sharing a code snipped? Thanks again for your help.

[Siliconrob]

I have had problems with SqlGeometry before with respect to serialization so I stick to WKT (seems to always be safe even if it is big) or WKB when serializing across languages in this case C# to javascript. I have the SqlGeometry column in the database and then keep a computed column of the current geometry as WKT. Anyway after I make the call to the database and the sql function splits the multipolygon into an array of polyons it is returned as WKT and the WKT is an array of polygons. Then I use the Terradue GeometryFactory.WktToFeature method and fill my FeatureCollection which will return valid GeoJSON. It would be nice if I could link you to the entire project code so you could see how it works, but most of it is not Open Source at this time. I am trying to persuade my company to publish it in entirety, but the customer is an older organization which has not made this a priority at this time.

Code snippet below.

var fc = new FeatureCollection();
foreach (var current in counties)
{
var feature = GeometryFactory.WktToFeature(current.WKT);
feature.Id = current.Id.ToString();
feature.Properties.Add("Name", current.Name);
fc.Features.Add(feature);
}

[lvigdorov]

Got it, I'm doing pretty much the same, except using GeometryFactory to get the multipolygon from sql WKT (my geo objects are stored in sql as bynary) and looks like the last line in the code below is generating an invalid geojson. Are you doing the same to serialize the feature array? Thanks again and my apologies for bugging you this late.

                var city = context.Cities
                .First()
                .CityPolygon;

                var mPoly = GeometryFactory.MultiPolygonFromWKT(city.AsText());
                var fc = new FeatureCollection();
                foreach (var polygon in mPoly.Polygons)
                {                    
                    var feature = GeometryFactory.WktToFeature(polygon.ToWkt());
                    fc.Features.Add(feature);                    
                }

                var geoGson = JsonConvert.SerializeObject(fc, new JsonSerializerSettings { NullValueHandling = NullValueHandling.Ignore });

[Siliconrob]

I use ServiceStack.Text to do the serialization, which is automatic in this case as ServiceStack services multi format serializable by the format request i.e. if I request application/json it comes back as json or if I request html/text it comes back as a html formatted table of data.

It is the ToJSON method. Terradue project used to use ServiceStack 3 which was freely licensed so you could try that serializer from NuGet, but I pay for ServiceStack 4 because it is literally the best .NET project/framework I have ever used and they earned every penny and more I have spent on them.

[emmanuelmathot]

Released in 1.5.9
distributed on nuget: https://www.nuget.org/packages/Terradue.GeoJson/1.5.9

[jstone-ponderosa]

I have abandoned Terradue due to way to many bugs and created my own custom GeoJson converter for geographies. I am now unsubscribing from this thread.

[lvigdorov]

Siliconrob, thanks for the tips, really appreciate your help.