[gdal-dev] How to read GML/GeoRSS directly from XML string?

[Chaitanya kumar CH]

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 <anakintang at 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
>
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> gdal-dev at lists.osgeo.org
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>



-- 
Best regards,
Chaitanya kumar CH.

+91-9494447584
17.2416N 80.1426E
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