[OSM-talk] HOWTO: edit GPX tracks using JOSM

[Rory McCann]

Hi,

I've just got my NaviGPS BGT-31 and I made my first trace today. I got 
the data off it with gpsbabel 1.3.5 and got it into GPX format. However 
I wanted to clean it up a bit first. I couldn't find any way to edit it. 
  I was able to convert it to OSM format using gpsbabel with this 
command: "gpsbabel -i gpx -f trace.gpx -o osm -F trace.osm", I could 
then open it in JOSM and remove some bad points. However coverting that 
OSM file back into GPX for upload was troublesome.

I first tried to save it as GPX format in JOSM, but that didn't save the 
timestamp data, which broke the import. Then I tried converting the OSM 
file to GPX using gpsbabel, but that laid out the file differently from 
before, so the importer couldn't see the points in it.

Eventually I wrote this XSLT file for converting from OSM to GPX (both 
of which are XML). Apply this template to the OSM file like so:

xmlstarlet tr osm2gpx.xslt trace.osm > trace.gpx

Here's the file:

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" 
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="/osm">

<gpx
  version="1.0"
creator="gpsbabel - http://www.gpsbabel.org"
xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"
xmlns="http://www.topografix.com/gpx/1/0"
xsi:schemalocation="http://www.topografix.com/gpx/1/0 
http://www.topografix.com/gpx/1/0/gpx.xsd">
<trk>
<trkseg>

<xsl:for-each select="node">
     <xsl:sort select="@timestamp" />

     <trkpt>
         <xsl:attribute name="lat"><xsl:value-of select="@lat" 
/></xsl:attribute>
         <xsl:attribute name="lon"><xsl:value-of select="@lon" 
/></xsl:attribute>
         <time><xsl:value-of select="@timestamp" /></time>
     </trkpt>

</xsl:for-each>


</trkseg>
</trk>
</gpx>

</xsl:template>

</xsl:stylesheet>



Happy Hacking

Rory