[Talk-us] How to use 2010 NAIP imagery for tracing?

Ian Dees ian.dees at gmail.com
Sun Dec 5 05:02:11 GMT 2010


On Sat, Dec 4, 2010 at 7:25 PM, Toby Murray <toby.murray at gmail.com> wrote:

> Well I've been using it in JOSM for a good chunk of the day now,
> editing I-70 in western Kansas and eastern Colorado along my drive to
> wherecamp. It has been working pretty well. Every once in a while it
> seems to slow down a bit but it is certainly usable.
>
> I am using the tilecache in the imagery plugin. I did try the WMS
> service as well. I gave the WMS plugin the capabilities URL and it
> constructed a URL that errored out because it didn't have a "style"
> parameter. I'm not sure if that is a bug in the WMS plugin or not but
> after I added "&style=default" to the URL it worked as well. At high
> zoom I noticed that there was a tiny offset between the tilecache and
> the WMS imagery. Probably just a few inches on the ground. Maybe it is
> just a projection thing?


The WMS plugin makes EPSG:4326 requests and the tilecache makes requests in
the web mercator projection, so the offset is probably from projection, and
the tilecache is probably more correct than WMS.
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