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Are there open access terrain pyramidal map tiles with a permissive usage license like OpenStreetMap's? I'm building aviation-related maps with Polymaps and need a good raster basemap. The Google terrain tiles are just perfect for my purposes: restrained colours, not too many features, and a clear view of terrain. Unfortunately Google does not allow use of their map tiles in any library but their own Javascript.

Alternatives I've tried.. OpenStreetMap's maps all seem to be road maps. The OpenCycleMap does include terrain, but then it has a lot of other high contrast features on top that make it unsuitable for my needs. USGS has some terrain tiles at the National Map, but they're unstyled and lack any descriptive features. I know it's possible to generate and serve my own tileset using a free datasource like SRTM, but that's an awful lot of work to design and operate.

I'm able to pay a modest cost for bandwidth; mostly I want to avoid spending the time generating my own tileset. Terrain maps seem like a common need, I'm surprised I haven't found one!

Edit since posting this question I've found a few more options. Microsoft's Bing Maps include terrain tiles; with somewhat flexible, but limited terms of service. GeoiQ/GeoCommons has the Acetate tiles which are specifically designed for my purpose.

Edit 2 this post had a small part in inspiring Mike Migurski / Stamen's terrain map based on open data. More at maps.stamen.com.

Edit 3 MapBox also now has a terrain layer. I'm unclear about the licensing, but the company is generally open source friendly.

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7 Answers

TopOSM has terrain tiles - though limited coverage (US Only)

enter image description here

http://www.toposm.com/us/

Full Details http://wiki.openstreetmap.org/wiki/TopOSM

All the Rendering and Source files are available

http://svn.openstreetmap.org/applications/rendering/toposm/

License is the same as Open Street Map

OpenStreetMap Data is available under the Creative Commons "Attribution-Share Alike" (CC-BY-SA) license. NED and NHD data from USGS, being the work of a US goverment agency, is considered public domain. MassGIS data is free for any use, as long as proper attribution is given. Therefore, this topo map is available under the CC-BY-SA license as well

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These are very close to what I'm looking for. The features are nicely split in a second transparent overlay on the terrain map. Only drawbacks are it's US only (NAD, not SRTM) and I'm not wild about the inconsistent colour shading. But it's a great resource, thank you. –  Nelson Mar 29 '11 at 15:27
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Mike Migurski (of Stamen Design) recently made a major new open terrain map: details on his blog and I put up a quick map viewer for it. It does terrain relief shading with various DEM sources combined with roads, labels, etc from OpenStreetMap. The source code to generate the map is on GitHub.

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You can generate your own using Maperitive:

A sample hiking map using such tiles.

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This a very good solution. –  Mapperz Mar 29 '11 at 13:51
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The folks at telascience are starting to revive the OpenAerialMap.org project which is on hold for now. They have already processed NAIP which can be found at http://hyperquad.telascience.org/naip/ They also have world coverage of Landsat done.

As far as contours, elevation, shaded relief, etc, part of the plan is to include SRTM http://srtm.csi.cgiar.org/ (for the entire world) and NED http://seamless.usgs.gov/about_elevation.php for the US. You should hit the IRC #telascience channel on Freenode and ask.

Of course, you can always use the links that I gave you above to download the data and do it yourself with geoserver or mapserver if you wished.

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Cool data! But I'm looking for shaded terrain, not aerial photos. –  Nelson Mar 29 '11 at 16:31
    
I guess my answer was too short, SRTM and NED are part of the plan, too. Edited my answer. –  Ragi Yaser Burhum Mar 30 '11 at 17:32
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The Natural Earth 1:10m data is a good place to start, but not at the resolution of the Google Maps terrain data. If you can deal with a medium resolution dataset, then styling something like the 250m SRTM data isn't too bad, but if you're interested in something at a higher resolution, it may be worth contacting the OpenCycleMap folks and see if you can get access to the data prior to the inclusion of the unwanted features.

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Thanks for reminding me of Natural Earth. It's a beautifully rendered map, really great piece of work. But 1:10m scale is just way too coarse for my purposes. I need about 1:200,000 to correspond with a Google Maps zoom level of 11. Naturally at that size, it needs to be pyramidal tiles. –  Nelson Mar 29 '11 at 16:03
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Another one is Closed Contour Maps

http://www.closedcontour.com/

blog about it last week: http://mapperz.blogspot.com/2011/03/closed-contour-sps-maps.html (blog post relevant to GISse question not self-promotion)

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Thanks! These are beautiful maps but seem limited to a small area of California for now. –  Nelson Mar 29 '11 at 15:26
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I used Maperitive last night to cut a custom offline map. Very easy, very effective. I tinkered a bit with layers until I had the map of my dreams' for the mountain running map I required.

My guide was this "ten minute" tutorial, which obviously is going to cut short of your needs a bit.

BE WARNED: towards the end of the tutorial, you will get to spot where there is a dead URL for his final example for the actual HTML. I considered this a non-deal breaker, I still made my map work even with limited OpenLayers experience, so you should be OK.

http://braincrunch.tumblr.com/post/9921938947/maperitive-tutorial-a-hiking-web-map-in-ten-easy-steps

Step 9: Preparing HTML We will need to prepare a simple HTML landing page for our map. The easiest way to this is to reuse the page from my sample map (bad/404 link), but we will need to make a few changes in the code so it reflects our own map area:

The authors "sample" is missing, that page 404's for me anyhow. The good news is, we are working with an offline map at this point, and its OpenLayers so its fairly simple to find another provider of that HTML you need. Here are a couple links, I think you can get your tiles working if you look around.

Openlayers HTML code samples: http://wiki.openstreetmap.org/wiki/OpenLayers_Simple_Example#The_smallest_example

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