How can I validate the geometry in Openlayers?
I need to check "MULTILINESTRING()" (which is empty) is valid/not valid. In postGIS, for Geometry validation we are using "isValid()" function. Like this, is there any options in Openlayers?
asked Jan 28, 2014 at 7:29
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How are you getting/building the Geometry? From User interaction? or From GeoJSON/WKT? or something else?– Devdatta TengsheJan 28, 2014 at 7:39
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From user interaction– Mohammed shafeekJan 28, 2014 at 8:46
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Please provide more information on how you are getting the geometry from the user. Please see this post on how you could improve this question: meta.gis.stackexchange.com/questions/3349/…– Devdatta TengsheJan 28, 2014 at 9:25
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2 Answers
In OpenLayers you can't but you can use the excellent JavaScript Topology Suite (a Javascript rewrite of the Java Topology Suite).
Example:
var reader = new jsts.io.WKTReader();
var geom = reader.read('POLYGON ((80 300, 280 300, 280 80, 80 80, 80 300), (260 280, 180 200, 100 280, 100 100, 260 100, 260 280))');
console.log(geom.isValid());
If you are using geodata through some form of GeoJson I can recommend this link;
It has an API that you can use as well, both python and javascript are explained on the website. With the api you are able to post a geojson and it will reply with a request status.
answered Jan 28, 2014 at 11:07
