[OSM-talk] relating trace points to gpx files

[Andy Robinson]

Yes, when you download track points through the API into JOSM they arrive as
points with no timestamp info and are therefore all placed in one layer.
When sent from the server it is possible that they are delivered in
sequential order as they reside on the database and hence some degree of
logic when displaying with "draw lines between raw trackpoints" turned on.
But if there are a lot of points in the area you get an unholy mess of
lines. This JOSM feature is only really usable for displaying your own
separate layered timestamped gpx files and not the point data pulled from
the server.

Having said that, the "draw lines between raw trackpoints" is a great way of
establishing the basic wire frame of your track if you have widely dispersed
points (ie long logging interval). It's less helpful I find for close
logging at 1 sec per point from walks or bike trips.

Cheers,

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 Andrew Loughhead
>Sent: 14 July 2006 05:05
>To: Erik Johansson
>Cc: Talk Openstreetmap
>Subject: Re: [OSM-talk] relating trace points to gpx files
>
>On Wed, 2006-07-12 at 10:57 +0200, Erik Johansson wrote:
><--snip-->
>> A far as I know (from reading the code)  when you delete a GPX file,
>> the points will be marked invisible. So they will disappear from the
>> rendered images.
>
>Thanks Erik - my impression was wrong, and this does in fact happen,
>with fairly immediate effect in JOSM, and with maybe a 24 hour delay in
>OSM.
>
>I have been able to delete all my files and start loading them
>individually, checking each result in JOSM.
>
>One question for the list: in JOSM it seems that if raw gps mode is used
>for an OSM download, that all points in view are treated as being a
>single track, based on sequential time stamp?  The result being that
>relatively random straight segments appear just because there happen to
>be some track points in view?  The manual doesn't really say.
>
>ta
>Andrew.
>
>
>
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