Tan Hao Feng <htan <at> hsr.ch> writes:
> Dear GDAL developers, > > I'm trying to display the boundary out from QGIS from the following steps. > > Add Vector Layer. > Select Protocol and > insert the URL with Type as GeoJSON and select Open. > > > > The URL is http://tools.wmflabs.org/wiwosm/osmjson/getGeoJSON.php?lang=en&article=Singapore which > has both type "Points" and "Polygon". > > Is there any way to read the Polygon file only? > > Thanks! > > Hao Feng. Hi, That GeoJSON does not contain point and polygon types, it contains only one type and that is GeometryCollection as you can test with >ogrinfo -ro /vsicurl_streaming/"http://tools.wmflabs.org/wiwosm/osmjson/getGeoJSON.php?lang=en&article=Singapore"; INFO: Open of `/vsicurl_streaming/http://tools.wmflabs.org/wiwosm/osmjson/getGeoJSON.php?lang=en&article=Singapore' using driver `GeoJSON' successful. 1: OGRGeoJSON (Geometry Collection) What you can do is to write geojson into a Spatialite-db by exploding the collections >ogr2ogr -f SQLite -dsco spatialite=yes -explodecollections test.sqlite /vsicurl_streaming/"http://tools.wmflabs.org/wiwosm/osmjson/getGeoJ SON.php?lang=en&article=Singapore" Finally you can read from Spatialite only geometries which are of type "polygon" >ogrinfo test.sqlite -sql "select * from ogrgeojson where geometrytype(geometry)='POLYGON'" Programmers for sure know some more sophisticated ways to achieve the same result. This is an end-user solution. -Jukka Rahkonen- _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
