Thanks all for the replies. (I'm replying only to Richard here, but I've
read each and every one.) At the point, the project is a demo that I
want to do and try to impress people with, so the objectives are really
mine. What I wanted was to show the leaflet-based slippy map and when
the user hovers/clicks on a given track, the elevation profile is
displayed somewhere in a pop-up/frame/etc. Something close to this example:
http://mrmufflon.github.io/Leaflet.Elevation/example/example.html
(I think it's using geojson here.)
The hope was that I would convince them to also contribute the path
information to osm, though most likely, that would require they maintain
the data in two places: osm and their local gpx/geojson files with
elevation.
I've read somewhere that the srtm data has, at best, 30m resolution. I
don't know that it's resolved enough for
hiking/snowshoeing/cross-country skiing? I can think of features where
greater than 30m resolution would be helpful. Then again, I just looked
at opencyclemap for that area again, and the resolution might be plenty.
I'll have to look again.
Cheers,
Charles
On 02/23/2014 04:40 PM, Richard Weait wrote:
On Sun, Feb 23, 2014 at 3:42 PM, Charles Basenga Kiyanda
<perso...@charleskiyanda.com> wrote:
[ ... ]
Specific question:
We don't store elevation data in osm in a standard fashion and I was
hoping I could show the volunteer organization a tentative alternate
workflow that would be as little work for them as possible and also give
them an incentive to keep the osm trail data accurate.
I think that the main issue here is "how do they want to see / use the
elevation data?"
There are several existing styles / tiles that use contours and or
hill shading. There may also be contours and hill shading that are
available as overly layers for you to add to your own styles. (If
their aren't, that may be an idea for a value add service. ;-) )
There was a service, run by long time OpenStreetMap user lambertus,
that displayed an elevation profile graph of a selected way. That
specific source is gone or moved now, but this wiki page shows some of
the similar details from a related summer of code project.
http://wiki.openstreetmap.org/wiki/Route_altitude_profiles_SRTM
It also appears that the routing engine YOURS can interpret elevation
data to apply variable costing when evaluating or planning routes.
http://wiki.openstreetmap.org/wiki/YOURS
And there are certainly more things that we can do with elevation that
are interesting, depending on the audience.
Is that enough to get you started?
But, yeah. The elevation data doesn't go into the OSM data base.
Others have used SRTM to inform their OSM objects of elevation matters
and then done interesting this with it.
I gave an Intro to OpenStreetMap talk to some trail folks recently.
It would be great to see them contributing to and benefiting from
OpenStreetMap.
_______________________________________________
Talk-ca mailing list
Talk-ca@openstreetmap.org
https://lists.openstreetmap.org/listinfo/talk-ca
