I took a peek at this a while back and came to the conclusion that it wasn't as useful as tiling the seamless server because a) it has older data and b) is harder to work with.<div><br></div><div>But it's there, so there's no harm in using it. I think it'd probably make more sense to use a tilecache/stache plugin than to grab each "tiled GeoTIFF" and run gdal2tiles on it. I can take a peek at it later tonight if no one else does.<br>
<br><div class="gmail_quote">On Mon, Jun 6, 2011 at 12:09 PM, Josh Doe <span dir="ltr"><<a href="mailto:josh@joshdoe.com">josh@joshdoe.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
Has anyone used the USGS High Resolution Orthoimagery available via<br>
the Tiled Data Distribution System (TDDS)? The Seamless data is what<br>
is available via the USGS WMS servers as described on the wiki,<br>
however there's a great deal of imagery which is not on this service:<br>
<a href="http://orthoimagery.cr.usgs.gov/dispatches/PRODUCT_Orthos.html" target="_blank">http://orthoimagery.cr.usgs.gov/dispatches/PRODUCT_Orthos.html</a><br>
<br>
At least for my area, the imagery from the Tiled service is far<br>
superior to what is available on the Seamless service (via WMS).<br>
However, this imagery can only be obtained by getting download URLs<br>
from their website or via a SOAP service, which results in a ZIP file<br>
containing the requested tile. In my case the tile was a GeoTIFF, but<br>
other formats may be possible. Of course, to make this usable in JOSM<br>
or Potlatch, more work must be done. Perhaps the easiest method would<br>
be to run GDAL2Tiles on the GeoTIFF to create a TMS-like cache.<br>
<br>
I'd be interested to know if anyone has used the TDDS. It would be<br>
quite useful to create a script that queries the USGS servers for<br>
available layers, downloads the appropriate ZIP packages, runs<br>
GDAL2Tiles on them, and then provides the user with a directory/URL<br>
that can then be used in JOSM (I'm not sure if Potlatch provides for<br>
local caches). However if someone has already created such a script,<br>
you'll save me the effort!<br>
Thanks,<br>
-Josh<br>
<br>
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