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

[Yingqi Tang]

Hi Chaitanya,

This works great, thanks a lot for the advice. Here is basic code pattern:

    inputDataStr = "<input_geojson_or_gml_str>";
    gdal.FileFromMemBuffer('/vsimem/temp', inputDataStr);
    inputDriver.Open('/vsimem/temp', 0);

Thanks,
Yingqi

On Tue, Jul 3, 2012 at 8:18 PM, Chaitanya kumar CH
<chaitanya.ch at gmail.com>wrote:

> 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
>>
>> _______________________________________________
>> gdal-dev mailing list
>> gdal-dev at 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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