[Talk-us] Reminder: OSM US Tile Server

Apollinaris Schoell aschoell at gmail.com
Sun Jul 15 19:13:38 BST 2012


something is wrong with the USGS scanned topo map layer.  At low zoom the alignment is perfect and when zooming in it suddenly jumps approx 50-100m east. I can see this in San Francisco and from there south to Mountain View.  It looks like an L-shaped area with SF at the north end. North and East of SF is good. then extends further south-east to at least to Mountain View but no more than Sunnyvale. 
I have started to trace the areas but not yet finished. One place in SF reminded me of the same problems on the terra server. Is this data a mirror of the terra server? I know a couple other places to check but it will take some time to verify.
For California and I think also for the rest of US there are far better sources of scanned topo maps. Any chance to fix these? I can offer some help to get the scanned maps and eventually with tiling too if there is some documentation available.


On Jul 14, 2012, at 5:19 AM, Ian Dees wrote:

> Hi everyone!
> I wanted to remind you all that OSM US has its very own tile server that's currently serving a couple very useful tile layers (and some other moderately useful layers):
> http://wiki.openstreetmap.org/wiki/Foundation/Local_Chapters/United_States/Servers/Imagery
> I want to especially point out the new USGS layers I added earlier this week:
> Scanned Topos: Shows scanned USGS topographic maps. These are usually the source for GNIS points and tend to be relatively old (especially when zoomed in), so you can look for data changes or spot incorrectly-named features.
> "Large Scale" imagery: This is an amalgamation of all USGS imagery. When you're zoomed out (it starts at zoom 12), it uses NAIP (~1 meter resolution), but as you zoom in it will switch over to using other, higher resolution sources if they are available. I believe it includes sources that aren't in the HRO imagery layer. This is probably the best source to use for general mapping.
> Feel free to use these for your day to day mapping. In some cases the USGS has data that Bing hasn't included yet, so it's definitely worth adding to your arsenal.
> -Ian
> PS: If you have any ideas for other layers you'd like to see, I'm happy to try to get them rendered or shown here.
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