[talk-au] new face

David Groom reviews at pacific-rim.net
Thu Nov 8 10:02:28 GMT 2007


> ----- Original Message ----- 
> From: "Eric Rose" <ericr at wamble.net>
> To: <talk-au at openstreetmap.org>
> Sent: Thursday, November 08, 2007 9:12 AM
> Subject: [talk-au] new face
>
>
> Hi,
>
> I new here, and just thought I'd introduce myself and ask for some
> information
> on how you guys (girls?) do things.
>
> Firstly, I'm Eric. I cycle and keep track of my trip stats with a Garmin
> Edge
> 305, although I started out using an Etrex Summit, just for my ride diary
> maps. Recently I also bought a Nokia N800 and have been playing with Maemo
> Mapper. I have a year and a half of tracklogs from my daily commute and 
> some
> cycling around Sydney, along with some longer logs from the NSW Big Ride;
> all
> stored on the MotionBased website (motionbased.com).
>
> I guess my main question is how you all collect and work on data. Having
> loaded the track log from the 'Gong ride last Sunday into JOSM, I can't 
> see
> any way of turning that one long track into smaller pieces such as
> individual
> streets or  roads. Is that necessary?

The basic principle is that the tracklogs provide an underlying area over 
which to "trace" the road, using the JOSM draw nodes tool.

To be honest I'd choose this method first, especially until you are happy 
with the JOSM tools, and OSM mapping techniques

If you really want to you can convert a tracklog to data automatically, but 
unless you have been travelling in one direction along one road, you'll end 
up with a bit of a mess.  However this "mess" can still be worked on if you 
like.  What you'd need to do is:

1) convert tracklog to data layer - right click on the layer name in the 
layers panel and choose "convert to data layer".
2) split the resulting since way into smaller ways for each road section - 
highlight a node where you want to split, then Tools>split way 
(CTRL-SHIFT-P).
3) tag each resulting way with the appropriate tags

> Do people work on the principle that
> each street or other line-based features should be collected as individual
> tracklogs, or do you have some tool that you use to split long tracks (or 
> is
> there some trick I don't know about)?

Tracklogs for a whole area are fine

>
> Is it the correct thing to upload whole tracklogs like the Gong ride to 
> OSM,
> or should it be preprocessed first?

Tracklogs should be uploaded to OSM, as they:
1) provide evidence of how the data was collected;
2) when others upload tracklogs for the same road they allow you to note 
variances due to GPS errors and correct the original mapping


> This christmas, I'm planning a cycle trip from Coffs Harbour through 
> Grafton
> and Casino to Mullumbimby on the north coast of NSW, along roads that 
> aren't
> known to OSM. I'm hoping to fill in a bit more of the area, particularly
> around the destination if I can get some pointers in how to effectively
> contribute.
>
> Eric

If you want to do some mapping, and want someone to look over the results 
let me know the area you've been working in and I'll have a look.
( if the main map window shows the area you have been working on you can get 
the bounding box URL for that area, by clicking the download button (or 
CTRL-SHIFT-D), choosing the bounding box tab, and copying the URL you see in 
the box).

Happy mapping

David






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