[OSM-talk] GPS scribble in JOSM

[Andy Robinson]

You have "Draw lines between raw gps points" turned on in preferences and
this feature does not work with downloaded gps points from the server via
the API. This is because all points from the API are delivered in bulk and
while there is in theory some logical order there is no way for JOSM to
understand where one track starts and another finishes nor to guarantee that
the order of delivered points is logical. The "Draw lines between raw gps
points" is only really beneficial for individual tracklogs (your own or
public ones downloaded from the "GPS traces" page). Its most beneficial use
is for those individual tracklogs which have sparse coverage in a small
geographical area. Make it much easier to see the route the log takes.
Personally though since I log at 1 sec intervals I don’t find I need to use
this feature very often.

Hope this helps

Cheers

Andy

Andy Robinson
Andy_J_Robinson at blueyonder.co.uk 

>-----Original Message-----
>From: talk-bounces at openstreetmap.org [mailto:talk-
>bounces at openstreetmap.org] On Behalf Of Ed Davies
>Sent: 04 September 2006 1:41 PM
>To: talk at openstreetmap.org
>Subject: [OSM-talk] GPS scribble in JOSM
>
>When I download some GPS data from OSM into JOSM they
>come out as scribble lines.  E.g., here's a screenshot
>of tracklogs downloaded half an hour or so ago for the
>Basingstoke area:
>
>   http://www.edavies.nildram.co.uk/2006/09/osm/basingstoke-josm-
>screenshot.png
>
>I've turned off all of the layers except for the downloaded
>GPS tracklogs.  I've zoomed out slightly relative to the
>original block downloaded.
>
>Any idea what's going on?
>
>I have a theory/hunch/suspicion: if two tracklogs were
>recorded at the same time could it be that OSM or JOSM
>is taking the points in time order and therefore jumping
>backwards and forwards between the two logs?
>
>This is:
>
>Java OpenStreetMap Editor Version 136
>last change at 2006-08-21 18:07:10 +0200 (Mon, 21 Aug 2006)
>Java Version 1.5.0_07
>
>Ed.
>
>
>
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