[gdal-dev] Writing GPX Files with multiple Extensions

[Pouliot, Christopher (MNIT)]

Even,

Thanks for the response!  I see that GPSBabel uses GDAL and writes out multiple extensions.  I'll check with them to see how they are doing it.

Chris

-----Original Message-----
From: Even Rouault [mailto:even.rouault at mines-paris.org] 
Sent: Thursday, November 07, 2013 1:22 PM
To: gdal-dev at lists.osgeo.org
Cc: Pouliot, Christopher (MNIT)
Subject: Re: [gdal-dev] Writing GPX Files with multiple Extensions

Le jeudi 07 novembre 2013 16:51:35, Pouliot, Christopher (MNIT) a écrit :
> Hello All,
> 
> I am currently using GDAL 1.9 and I'm writing out GPX files for 
> uploading onto Garmin units.  Garmin has many different GPX extensions 
> (gpxx, gpxtpx, gpxtrx, etc) for defining extra attributes for their 
> GPS data.  I am wondering how I would specify these multiple extensions in my code?
> Currently, I am defining a single extension as shown below:
> 
> ds = drv.CreateDataSource(outputFilePath, new string[] { 
> "GPX_USE_EXTENSIONS=YES","GPX_EXTENSIONS_NS=gpxx","GPX_EXTENSIONS_NS_U
> RL=h ttp://www.garmin.com/xmlschemas/GpxExtensions/v3"});}
> 
> How would I go about setting more namespaces (gpxtpx, gpxtrx, ...)?

This is not possible currently. Would require an enhancement in the driver, like acception a comma separated list of values for GPX_EXTENSIONS_NS and GPX_EXTENSIONS_NS_URL

> And
> then how would I specify that an attribute belongs in a particular 
> extension?

It could detect it by the name of attribute. For example, gpxx_foo, gpxtpx_bar, gpxtrx_baz

> 
> Thanks,
> 
> Chris
> 
> Chris Pouliot  |  GIS Application Developer MN.IT Services @ 
> Department of Natural Resources
> (651) 259-5491 (w)  |  christopher.pouliot at state.mn.us 
> [cid:image002.jpg at 01CEDB9E.F20C9670]<http://www.mn.gov/oet>  Information
> Technology for Minnesota Government   |  
> mn.gov/oet<http://www.mn.gov/oet>

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