Downloaded GPS data is displayed in reverse

[anonymous]

Downloaded GPS data is displayed in reverse.

[anonymous]

WHat do you mean with in reverse?

[anonymous]

Arrow pointing into the wrong direction

[anonymous]

The raw GPS data from the server is no longer grouped in tracks, but as individual points. Certain side effects result from this, which are not fixable inside of JOSM.

[anonymous]

You are not saying the server returns the points in random order are you?

As long as the points are returned either from oldest to newest or from newest to oldest, this tickt is valid.

[anonymous]

Give an example. I cannot reproduce it here.

The server returns the points according to their timestamp. If multiple tracks are used at the same time they get e.g. intermixed.

[anonymous]

Replying to anonymous:

Give an example. I cannot reproduce it here.

Sure. I downloaded ​http://www.openstreetmap.org/index.html?mlat=49.50996750339317&mlon=8.639318025366629&zoom=18 with GPS Tracks.

For pic1 I loaded my GPX first, then added the download (and zoomed in a bit). You can clearly see my local GPX, it is displayed in green. The exact same data also comes from the download, so you can see the purple arrowheads below the green track---pointing into the reverse direction. Also look at the right side of the picture: You can see that all tracks on the right lane of the autobahn go from top to bottom, and the ones on the left lane go from bottom to top. Would be ok for a UK motorway, but not for a German autobahn...

For pic2 I restarted JOSM and only downloaded the data with the URL as given above. You can see, that the direction of the arrows has not changed.

[anonymous]

Please attach two other things:

a) Your GPX file

b) Your JOSM configuration file (remove username/password before attaching it).

[anonymous]

I attached the config.

As said, it happens all the same without any loaded GPX. I even tested on another PC with a freshly installed JOSM.

[anonymous]

PS: Tested with v1004

[dieterdreist]

it's still valid and not only for some strange coincedences but for ALL gpx-direction arrows. IMHO you can just reverse them to fix it (or maybe this depends on some strange other reason and therefore only applies to some users).

I changed the priority to critical because it can easily lead to erratous editing of oneways.

[dieterdreist]

maybe critical was too much ;-)

[xeen]

Is this really a major issue? I suspect most users use file -> open to display their GPS tracks, uploading and downloading again would be strangely cumbersome. Nevertheless, here's a patch that, as suggested, simply reverses the GPS points. I let it off by default for performance reasons (O(n) according to javadocs) and because this is no major issue so you'll have to set

download.gps.fixDirection

to true, once checked in.

[anonymous]

Nah. There must be a reason for this. Very likely JOSM handles downloaded GPX data wrong somewhere.

[xeen]

Here's a typical link that requests the GPX files from:

​http://www.openstreetmap.org/api/0.5/trackpoints?bbox=8.954239863526235,49.708102851502524,8.955104211021299,49.708750955319005&page=0

If you save the file as gpx and open it, you can see that the 4. decimal place of the longitude is descending (i.e. arrows are pointing to the left). My local gpx file has the points in reverse order (i.e. arrows are pointing to the right).

As far as I can tell it's a server issue.

[anonymous]

Added bug report at OSM: ​http://trac.openstreetmap.org/ticket/1605

[Bürste]

This ticket is closed.

[dieterdreist]

Replying to Bürste:

This ticket is closed.

This is a 13 Month old Bug, it WAS VALID at the time. I agree that the issue is not there anymore, but the resolution is solved, not invalid.