[gdal-dev] ogr2ogr and GPX files

[Even Rouault]

Hi,

I see your point...

The solution is the powerful OGR Virtual Dataset format !
See http://www.gdal.org/ogr/drv_vrt.html

In fact, the documentation should probably be extended to demonstrate the 
power of the OGR SQL for that particular case

Try to paste the following lines in a file (remapped_layer.vrt would be fine)

<OGRVRTDataSource>
    <OGRVRTLayer name="remapped_layer">
        <SrcDataSource>your_source.shp</SrcDataSource> 
        <SrcSQL>SELECT src_field_1 AS name, src_field_2 AS desc FROM 
your_source_layer_name</SrcSQL> 
    </OGRVRTLayer>
</OGRVRTDataSource>

Replace your_source.shp, src_field_1, src_field_2 and your_source_layer_name 
by the appropriate values from your source dataset and 'ogrinfo -ro -al 
remapped_layer.vrt' should show a structure compatible of a GPX file.

Best regards,
Even

Le Monday 03 March 2008 07:04:41 Dylan Beaudette, vous avez écrit :
> Hi,
>
> is there a simple approach (via ogr2ogr) to create GPS files which have
> standard waypoint tags such as <name>, <elev>, <cmt>, etc. by re-mapping
> columns in the attribute table of the source vector?
>
> for example:
>
> # export points vector from GRASS
> v.out.ogr in=wp type=point dsn=wp.shp
>
> # convert tp GPX:
> ogr2ogr -t_srs '+proj=latlong +datum=WGS84' \
> -f GPX -dsco GPX_USE_EXTENSIONS=YES \
> wp_gps.gpx wp.shp
>
> This results in a working GPX waypoints file, that when uploaded to a GPS
> is functional, but the waypoints are all re-named sequentially. Note that I
> am uploading the GPX file the GPS via gpsbabel.
>
> Does anyone know of the appropriate incantation that one could use to
> translate the column structure of the input wp.shp (i.e. the stuff in
> its .dbf) into standard waypoint tags?
>
> thanks in advance!
>
> PS: trying to write a simple tutorial for some colleagues [1]
>
> 1. http://casoilresource.lawr.ucdavis.edu/drupal/node/553