[Talk-ca] Geobase data vs. OSM data on import

[Steve Singer]

On Sun, 7 Jun 2009, Austin Henry wrote:


I encountered a bug in the roadmatcher matching where it would get confused 
and enter an infinite loop of sorts.

I patched it to detect the looping condition and break out.  The  version of 
the code I posted on github has this fix.

You can also get at a jar that works with openjump 1.3 + this change at

http://www.easy-share.com/1905578997/roadmatcher-1.4.jar

It might solve your problem.



> Hi all,
>
> I'm working on importing (most of) the 082E tile, and the part of the
> import process where you match roads in RoadMatcher is taking ages, even
> though there's very little data in OSM for the area (the reason I picked
> this tile, along with the fact that I used to live in the area).  The
> reason it's taking so long is the fact that the OSM data for Highway 3
> and the NRN data are very different in places.
>
> It seems like a combinations of things might have affected the data
> that's present now:
> - valleys throwing the GPS accuracy way out (or killing it entirely, and
>  enabling the "feature" of garmin (and other?) units where it just
>  interpolates until it gets a lock back);
> - low sampling frequency in the saved GPX tracks, which then got
>  imported directly, or was traced at low zoom levels (the satellite
>  data for most of highway 3 is low-res);
> - there are certainly other scenarios, but it's getting late and my
>  brain's a bit fuzzy from staring at RoadMatcher for hours.
>
> It looks like the data was generally collected in one drive through by a
> non-local.  I'm not saying the data's crap, some of is really quite
> good.  But there are parts of it where it looks like a helicopter was
> used :)  And I'm not entirely sure how trustworthy the NRN data really
> is -- presumably it's good enough for the government to use, and most of
> it says the positional accuracy is 25m or less...
>
> So, what should I do for an upload?  Just upload the standalone portions
> like the process says, or should I upload all of the data, and delete
> the current OSM data where it's strange?
>
> The files for this tile are at
> http://drop.io/bvhw44o#list/sort_by_name/order_by_asc/60
> for those who might wish to look at it.  I can find bounding boxes for
> some examples if folks wish them.
>
> peace,
> 	Austin.
>
> -- 
> Build a man fire, he'll be warm for a day.
> Set a man on fire, he'll be warm for the rest of his life.
>
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