parsing geojson points and extract the bounding box

[Luca De Felice]

Hi all,

I would like to parse a geojson file, which is actually a featurecollection of points, in order to get the minimum bbox.

I successfully parse data using NetTopologySuite.IO.GeoJson obtaining FeatureCollection Object, but I don't know if there is a simple way for getting the bbox of the set of points.

Do you have any suggestion?

thank you very much in advance.

Luca

[Diego Guidi]

try with IGeometryCollection.Envelope

[Luca De Felice]

Thnaks Diego, but the problem is how to get IGeometryCollection from FeatureCollection Object, look at the snippet below.

                string json = getJsonString(_url);

                var reader = new NetTopologySuite.IO.GeoJsonReader();

                NetTopologySuite.Features.FeatureCollection result = reader.Read<NetTopologySuite.Features.FeatureCollection>(json);

Grazie, Luca

[FObermaier]

You will have to iterate over the Features in the FeatureCollection and merge the Feature.Geometry.EnvelopeInternal items.

[Luca De Felice]

Thank you very much FObermaier, as usual you got the point, but what do you mean merge? should I use the method ExpandToInclude?

like below snippet>

                GeoAPI.Geometries.Envelope bbox = new GeoAPI.Geometries.Envelope();

                foreach (var feature in result.Features)

                {

                    bbox.ExpandToInclude(feature.Geometry.EnvelopeInternal);

                }

Thanks a lot, Luca

[Felix Obermaier]

Yes. That is it.

 

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