Upload .gpx

I managed importing GPX by using Geo Field of http://drupal.org/project/geo and as you mentioned http://drupal.org/project/geocode. With geocode installed you can select a filefield to provide the gpx data in the geo field settings. The GPX data then will be converted to a WKT linestring in geo field.

If you want the data to be in the OpenLayers WKT field, you could write the geo field's value to the OpenLayers WKT. But you also can use both fields in the same view.
The best solution would propably writing a geocode handler for the openlayers wkt.

After you added your filefield that will hold the gpx file, you have to add a new field of type "Geospatial Data" with the widget "Geocoded value from another field". The widget settings provide you with the opportunity to select the Filefield with handler 'geocode_filefield' and return value 'linestring'.

See screenshots:
http://drp.ly/1grddN
http://drp.ly/1gr8cJ

There are several ways you can deal with that:

• Let openlayers WKT and Geospatial Data coexist, so the user can either mark a location, or upload a gpx file, or both. So you have to show both value sets in the map. This can be managed by building two Openlayers Data views, and integrating both in your preset.

• Use openlayers WKT as primary field, and overwrite its value on a gpx filefield submission. Therefore you have to geocode the filefield during form submission by your own, using geocode functions -

  <?php
function geocode($handler, $input, $return = 'point', $options = array())
?>
  might help - and pass the value to your Openlayers WKT field as value.

• Write an additional widget (I mentioned handler before, but it has to be a cck widget), like in geocode_widget. This will replace the Openlayers Widget with an invisible widget (like it is done with Geospatial Data Field).

The solution (one of these or another) surely depends on the use case.

Unfortunately you have to write a custom module / mini module.
That has to extend the form submission of the node form, or hook_nodeapi, with additional handling that might use function geocode().

Something like that call should convert the gpx-file to a linestring.

This solution definitely needs coding experience in Drupal. Maybe http://drupal.org/developing/modules or http://api.drupal.org/api/drupal/developer--examples--nodeapi_example--n... will help you jumping in the big field of drupal modules.

This post is a bit old now but I have made a patch for geocode for this at http://drupal.org/node/853190

I still have a bit of work to do on adding some extra functionality but it is functional at this stage.

Note that you will also probably want the patch at http://drupal.org/node/973994
That patch makes it so that the file is only imported if it is a new file, not on every node save,
otherwise every time you save your node the gpx file import will overwrite any changes the user
has made to data using the openlayers map/wkt field.