[Talk-us] Whole-US Garmin Map (02-10-2010) update

Apollinaris Schoell aschoell at gmail.com
Thu Feb 18 17:13:48 GMT 2010


On 18 Feb 2010, at 2:27 , Sam Vekemans wrote:

> 
> I use mainly Roadtrip and all is scripted without install. If I absolutely need Mapsource then Mapset toolkit is sufficient and not much more complicated than starting an installer. I think mkgmap has also an option to create a a control file for a Mapsource installer with some 3rd party package tool. But once you mess up Mapsource Mapset Toolkit is a must have to clean broken registry.
> 
> Thats what happens to me.  thanks for explaining it :)
> The srtm groundtruth contours can easily  be installed using mapsettoolkit, so i make the img files available.
> 
and I should have said that contours as overlay are not very useful in Roadtrip/Mapsource only gps units show them as overlay. I have used it only to debug.
and I use mkgmap to compile the gmapsup.img. this is much faster than the export from Roadtrip/Mapsource

> 
> > Im manually making 10m contours for all of Canada (it will be a 2 gig
> > install when done) maybe someone wants to make on for all of USA?
> 
> have used this combination for a compromise of speed/size/precision. as said srtm data isn't that good and 10m seemed overkill. with NED data it's a different story
> 25m minor
> 100m medium
> 200m major
> 
> In canada we have access to Natural resources canada contour data that is available as 20m contours.
> Its the same contours that ibycus topo made.
> http://www.ibycus.com/ibycustopo/
> 
> So its really relative... if you hiking then 10m contours is great... and same if mountain biking. .. but if your road biking, then it might be a little much.
> 
> So i can make a separate map for the 25 meter  contours
>  

yes this is really user dependent and many in US will even prefer it in feet. that's why I have everything scripted and can easily rebuild with different parameters. groundtruth didn't work at all for me and have used gdal_translate, gdal_contour, shape-to-osmm, mkgmap with some perl wrapper code. didn't add the download from ftp feature because have all SRTM on disc.

> 
> what did you use for medium and major contours?
> 
> I just used the default that groundtruth gives.
> 1000 major
> 20 interm
> 10 minor.
> 
> Also, since the file is so big (3 gigs) it should be torrented, as well as distributed the same way Ubuntu is, by manually giving a DVD of it.  or snailmail a an empty sd card, and i can but it on the card and mail it back.
> Thats how the Ibycus topo is descributed in Canada.
> 

yes torrent is a perfect protocol for such data

> Also,
> http://touren.mospace.de/kachel.html
> looks like a handy service.
> I dont know who the author is it is, but it would be great to have the planet pre-done of 1 degree x 1 Degree contours.   ... maybe 25m would be sufficient for most users.   That way anyone can just create a mapsource map of whatever size they want.
> 
> Im fine with the quality of the SRTM contours (since there isnt anything else (that i know how to work with) that is better. :)

srtm is really bad in mountain areas where you care most. US has NED data and I plan to switch to that, for selected mountain regions worldwide  best data is available at http://www.viewfinderpanoramas.org/dem3.html
Aster is supposed to be better than SRTM but license is not as open as SRTM. also http://srtm.csi.cgiar.org/ is SRTM based with refined data. 

>  
> Cheers,
> Sam
> 
> 
> >
> > Sam
> >
> > On 2/17/10, Apollinaris Schoell <aschoell at gmail.com> wrote:
> >> have built contour line maps lately based on srtm data. If anyone is
> >> interested in a specifc area let me know. I am not such a web guru like
> >> Lambertus and have no host to provide them for convenient download. If
> >> someone can host them let me know.  most tiles are 1x1 degree except where
> >> it didn't fit in one .img
> >> But srtm data has many errors and gaps in mountain areas. Anyone knows where
> >> to get NED data for large areas? The seamless server is such a pain and it
> >> will take forever just for a single state.
> >> or we could start a crowd source effort to download and share them.
> >>
> >>
> >>
> >>
> >> On 17 Feb 2010, at 15:00 , Dave Hansen wrote:
> >>
> >>> On Wed, 2010-02-17 at 16:05 -0500, Mike N. wrote:
> >>>> Many thanks for this update - it has come in handy many times since the
> >>>> last
> >>>> update.   I was about to check with you to see if there was any way to
> >>>> update it, but you beat me to it!
> >>>
> >>> It's just about at the point where I can automate it to rebuild them
> >>> whenever Lambertus kicks off an update himself.  I'll let everyone know
> >>> when I get this set up.
> >>>
> >>> -- Dave
> >>>
> >>>
> >>> _______________________________________________
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> >>
> >>
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> >
> >
> > --
> > Twitter: @Acrosscanada
> > Blog:  http://Acrosscanadatrails.blogspot.com
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> 
> 





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