search

oobrien / oomap

OpenOrienteeringMap. Includes the website, tiling scripts, and mapnik stylesheets for OOMap and other raster tile layers.
GNU General Public License v2.0
45 stars 8 forks source link

Add contour lines #29

Closed rugk closed 1 year ago

rugk commented 6 years ago

If you need a data source, maybe look at OsmAnd, they have some data and it can be used in their applications. (AFAIK) Worldwide…

oobrien commented 6 years ago

It is possible to derive contour lines from global DEMs, although the process of doing this, and in particularly smoothing the lines is very computationally intensive, so not proposing adding this at this time. I will keep this bug open for now in case an external source of contours lines appears. OsmAnd have done this process, but it is involved, which is why they charge for it.

rugk commented 6 years ago

OsmAnd have done this process, but it is involved

It is what? AFAIK you can use them in the F-Droid version of OSM, so that seems to be okay.

hholzgra commented 3 years ago

I got the contour line for my print.get-map.org site from the maintainers of OpenSnowMap, it is a PostGIS dump that when imported creates a ~500GB contours table. This was a while a go already, but they replied quickly back then and were happily willing to share the data on request.

cadnant commented 3 years ago

Worth revisiting? Can use Phyghtmap to retrieve SRTM data and plot contours on-the-fly. cadnant/oomap@07d8a389bd739600f51b4936f612e021a8012ebe

oobrien commented 3 years ago

Definitely

cadnant commented 1 year ago

Contours enabled (more or less) globally through on-the-fly requests for SRTM or Copernicus height data, then generation and smoothing of the contours themselves. And yes, it was fairly involved 😀. See #69 . Additionally, LIDAR data added where easily available for bulk download.