Option to be able to use geojson feature of featurecollection

Aspose.GIS Product Family
1

HI,

From a rest-service I can retrieve single or multiple geojson features as text .
example of singele feature (shortend) :

{"type":"Feature","geometry":{"type":"Polygon","coordinates":[[[135099.3841000013,482298.6171000004] ...]]},"properties":null,"id":1823}

Example of multiple features in geojson text .

{"type":"FeatureCollection","features":[{"type":"Feature","geometry":{"type":"Polygon","coordinates":[[[135099.3841000013,482298.6171000004] ...]]},"properties":null,"id":1823},
{"type":"Feature","geometry":{"type":"Polygon","coordinates":[[[135099.3841000013,482298.6171000004] ...]]},"properties":null,"id":1824}]}

Can I use Aspose.Gis to convert from geoJson feature to Geometry ( IGeometry) .
Can I use Aspose.Gis to use the input geoJson feature to render to an image / png/ toImage function.

Hope you can help.

Regards,
Mehmet

2

Hi, @mcanavar

I need to explore your request. I’ll be back with an answer after the weekend.

Thanks

1 Like
3

Hi ,
Any info on my query about use of geojson .

Thank you.

4

Hi, @mcanavar

First you need to write each feature from multiple features in own text file.

File.WriteAllText("feature_i.json", content[i])

Second you need to open layers to handle the geometry of feature

using (var layer = Drivers.GeoJson.OpenLayer("feature_i.json"))
{
    // handle feature
    var feature = layer[0];
    Console.WriteLine(feature.Geometry.AsText());
}

Also you can render yuor layers to Svg\Jpeg\Bmp

using (var map = new Map(800, 400))
{
    map.Add(VectorLayer.Open(dataDir + "feature_1.json", Drivers.GeoJson));
    map.Add(VectorLayer.Open(dataDir + "feature_2.json", Drivers.GeoJson));
    map.Render(dataDir + "map.svg", Renderers.Svg);
}

More info: Map Rendering to Image SVG, PNG, JPG using GIS C# Library|Documentation (aspose.com)

Best regards

5

Hi @Evgeniy.Timofeev,

Thank you for your input. Basically you are saying that this only works if the json retrieved from the database, so in memory , has to be written to a fiscal file to be able to use the data .

This will / would be ok if it was to be used occasionally, but when using it iterating trough a database recordset I think it would perform poorly.

To be able to skip the save to a file part would be an huge improvement of usability for me.

Regards,
Mehmet

6

The library can work with formats in memory: Streams and Remote Storage|Documentation

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