Yingqi, Though the GeoJSON driver allows for reading the data directly, it is more like an exception. For consistent behavior between formats, you need to read the data from a data source like a file or url.
You can create a temporary in-memory file of your data using the method gdal.FileFromMemBuffer() Example at http://www.gdal.org/ogr/drv_georss.html There are also a few methods to import/export just the geometries. You can import GML and WKT [1] and export to GML, KML and JSON[2]. [1]: http://www.gdal.org/ogr/classOGRGeometryFactory.html [2]: http://www.gdal.org/ogr/classOGRGeometry.html On Wed, Jul 4, 2012 at 3:34 AM, Yingqi Tang <anakint...@gmail.com> wrote: > Hi, > > I am using OGR/GDAL to read GML/GeoRSS/GeoJSON from either local file or > url, the sample code is like below > ... > inputDriver = ogr.GetDriverByName(inputDriverType) > inputDataSource = inputDriver.Open(inputDataPath, 0); > ... > > It seems that I can pass in the GeoJSON string directly like: > > inputDataSource = inputDriver.Open(" > > {'type':'FeatureCollection','features':[{'type':'Feature','id':'OpenLayers.Feature.Vector_3449','properties':{},'geometry':{'type':'Polygon','coordinates':[[[-109.3449, > 63.6328125 > ],[-112.5,35.5078125],[-85.078125,34.8046875],[-68.90625,39.7265625],[-68.203125, > 67.1484375],[-109.6875,63.6328125 > ]]]},'crs':{'type':'OGC','properties':{'urn':'urn:ogc:def:crs:OGC:1.3:CRS84'}}},{'type':'Feature','id':'OpenLayers.Feature.Vector_07050618','properties':{},'geometry':{'type':'Polygon','coordinates':[[[-40.78125, > 65.0390625 > ],[-40.078125,34.8046875],[-12.3449,25.6640625],[21.09375,17.2265625],[22.5,58.0078125],[-40.78125, > 65.0390625]]]},'crs':{'type':'OGC','properties':{'urn':'urn:ogc:def:crs:OGC:1.3:CRS84'}}}]}", > 0); > > But it doesn't seem to work with GML or GeoRSS, did I miss anything? So > basically how can I read GML/GeoRSS directly from an XML string? > > Thanks > > _______________________________________________ > gdal-dev mailing list > gdal-dev@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/gdal-dev > -- Best regards, Chaitanya kumar CH. +91-9494447584 17.2416N 80.1426E
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