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Tiling/caching scheme for the World Imagery map

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07-19-2011 02:27 PM
DouglasOlcott
Deactivated User
The World Imagery map which is accessible at http://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer
has a tiling or caching scheme which doesn't seem to be taking advantage of the highest resolution (30cm) ortho imagery which is listed as one of the 4 layers.

When I zoom into this map in ArcMap 10 to a scale where I expect to see objects of 30 cm length or diameter - a scale of 1:1000 or higher - the image is fuzzy. The geographic area that I am viewing is the SF Bay Area, which I know was photographed in 2010 by the MS-DigitalGlobe Global Ortho Program. 20 LODs are listed for the tiling scheme, the lowest one - Level ID: 19 with the specs 
Resolution: 0.298582141647617 (meters)
Scale: 1128.497176 (meters)
It appears that the highest resolution imagery for this area was not used exclusively for tiling at this scale range but that all four layers were fused in producing the tiling. Can anyone explain why the highest resolution imagery was not used at this lowest LOD?

Doug Olcott
ISD - GIS
Santa Clara County, CA
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DorothyMortenson
Deactivated User
For Oregon, I find I can zoom to about 1:1,000 in urban areas and only 1:4,000 in rural areas. Since I am using this for an online web application, the inconsistency is a problem. I would rather have the service be a little grainy and be able to zoom to 1:1000 statewide.  I believe the quality of these photos would be acceptable.

What would it take to make this happen?

Dorothy
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