[Qgis-user] Creation of GPX file fails

[Bo Victor Thomsen]

Laurence -

Try the following for saving a shape layer as a valid GPX file (tested 
on QGIS 1.7.4/Windows 7-64 bit):

  * In the dialog "Layers" right click the name of the shape layer you
    want the save as a gpx file.
  * Then left click on item "Save as...". This action will show a new
    dialog: "Save vector layer as..."
  * Under "Format" : Choose "GPS eXchange format [GPX]"
  * Under "Save as": Write or browse the name for the new GPX file
  * Leave "Encoding" as "System"
  * Under CRS (upper dropdown): Choose "Selected CRS"
  * Under CRS (lower textbox): Browse the CRS to: "WGS 84" (It's
    *important* you choose "WGS 84"; the GPX format support*only* this
    CRS, but QGIS will happily write your data in any CRS)
  * If you have any unconventional GPX attributes in you data: Add
    "GPX_USE_EXTENSIONS=yes" in the "Data source" textbox.
  * Click on OK.

Regards
Bo Victor Thomsen
Aestas-GIS
Denmark

Den 07-03-2012 10:14, Laurence Béchet skrev:
> Hi,
> Thank you for the suggestion.
>
> I did the test and of course the gpx created is not good, with a list 
> of error messages (not right values, like:
> Error at file 
> C:\[...]\xerces-c-3.1.1-x86-windows-vc-10.0\bin/newtiti.gpx, line 76, 
> char 54
>   Message: value '1730878.68283692' must be less than maxExclusive 
> facet value '180.0'
>
> If I start from an existing gpx file that passes the test (like 
> created with dnrgarmin or mapsource) and try to upload it within Qgis, 
> when I check the metadata of the layer property, the Layer Spatial 
> Reference System is not correct
> *+proj=longlat *+datum=WGS84 +no_defs
>
> If I upload in Qgis the same data created by dnrgarmin but under the 
> projected shapefile type, then the Layer Spatial Reference System is 
> correct
> *+proj=tmerc* +lat_0=0 +lon_0=173 +k=0.9996 +x_0=1600000 +y_0=10000000 
> +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs
>
> *It's the general same issue: how do I force Qgis when uploading or 
> saving data in gpx file to use the correct Spatial reference system 
> (+proj)?*
>
> How do other users do? Because I don't see the point of this software 
> if i cannot send my data from Qgis to my gps ...
>
> Thank you

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