[gdal-dev] RE: Editing KML files using ogr_csharp.dll

[Kyle Shannon]

Can you report your gdal version and where you got it from?  Is it from gisinternals.com/sdk, or did you build it yourself?

From: Pouliot, Christopher (DNR) [mailto:Christopher.Pouliot at state.mn.us]
Sent: Monday, December 05, 2011 9:04 AM
To: Kyle Shannon; gdal-dev at lists.osgeo.org
Subject: RE: Editing KML files using ogr_csharp.dll

Thanks for the response Kyle.

  I do use the CreateDataSource() to create a new KML.  But am unable to open an existing KML for editing using the Open() code I specified below.

Chris

From: Kyle Shannon [mailto:KShannon at gcs-research.com]
Sent: Monday, December 05, 2011 9:54 AM
To: Pouliot, Christopher (DNR); gdal-dev at lists.osgeo.org
Subject: RE: Editing KML files using ogr_csharp.dll

Chris,

I don' know OGR very well, but I see a few issues.  I also am not sure about the c# bindings, I believe they are pretty complete though.

'''OSGeo.OGR.Driver drv = Ogr.GetDriverByName("KML");
DataSource ds = drv.Open("c:\\temp\\mykml.kml", 1);'''

Open() opens existing files, you need to use driver->CreateDatasource() to create datasets.  Open() opens files for editing.  If mykml.kml exists, use Open().

see http://gdal.org/ogr/ogr_apitut.html for information on using OGR to read/write data

'''Also, when creating a KML file from scratch is there a way to map the Name and Description fields to my existing fields so that the Name and Description appear in Google Earth?'''

See http://gdal.org/ogr/drv_kml.html for this, it appears to be possible.

There is also the libkml driver: http://gdal.org/ogr/drv_libkml.html

kss

From: gdal-dev-bounces at lists.osgeo.org [mailto:gdal-dev-bounces at lists.osgeo.org] On Behalf Of Pouliot, Christopher (DNR)
Sent: Monday, December 05, 2011 7:51 AM
To: gdal-dev at lists.osgeo.org
Subject: [gdal-dev] Editing KML files using ogr_csharp.dll

Hello All,

I have a C# application that uses OGR_CSHARP.DLL to read/write KML files.  I'm able to read from KML files fine.  I'm able to create a new KML file and write to it fine.  I am unable, however, to open a KML file to edit.  I'd like to be able to append a new layer (folder) onto an existing KML file.  I've tried both of the following code snippets:

//This returns NULL
OSGeo.OGR.Driver drv = Ogr.GetDriverByName("KML");
DataSource ds = drv.Open("c:\\temp\\mykml.kml", 1);


//This returns NULL
DataSource ds = Ogr.Open("c:\\temp\\mykml.kml", 1);


I'm able to use this code to edit File Geodatabases and Shapefiles but not KML.



Also, when creating a KML file from scratch is there a way to map the Name and Description fields to my existing fields so that the Name and Description appear in Google Earth?


Thanks,

Chris

Chris Pouliot
GIS Application Developer
Minnesota Department of Natural Resources
christopher.pouliot at state.mn.us<mailto:christopher.pouliot at state.mn.us>
(651) 259-5491


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