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<h2>Trackpoints </h2>Trackpoints are usually obtaiined from a GPS
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device such as a car GPS or a GPS tracker. Typically, a trackpoint GPX file
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obtained from such a device contains multiple tracking "sessions"
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separated by larger gaps or waypoints.<br>When importing a trackpoint file you may edit the trackpoints by marking the option<acronym> Edit trackpoints</acronym>
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in the <a href="geoTagging.html">GPS preference page</a>. You are then shown a specific dialog
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listing all subtracks contained in the imported files. You have several
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options for editing these subtracks before applying their trackpoints
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to your images:<br><ul><li><span style="font-weight: bold;">Edit subtrack.</span>
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You may want to modify start and end of the selected subtrack. The
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effect is the same as modifying the tolerance of the first or last
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trackpoint within this subtrack.</li><li><span style="font-weight: bold;">Remove subtracks.</span>
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Removes the selected subtracks from the list. The trackpoints contained
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in these subtracks are not considered for tagging images.</li><li><span style="font-weight: bold;">Join subtracks.</span>
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Joins the selected subtracks to one subtrack. The effect is the same as
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modifying the tolerance of the trackpoints at the gaps between the
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joined subtracks. This can be useful for a longer trip where the tracker had been switched off for longer intervals.</li><li><span style="font-weight: bold;">Split subtrack. </span>You
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may define a gap that separates the selected subtrack into two
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subtracks. The trackpoints contained in this gap are not considered for
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tagging images.</li></ul><br>These changes are not permanent - the original GPX files are not modified.
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