[gpl_list] Aerial Photo web services

[Brady Callahan]

Thanks for the info and examples Dorothy. 
 
As a related FYI about the 2009 imagery, in case folks missed it, Erik posted an Imagery Update from Geo message on GovSpace last month following the GPL discussion about the service(s) status. https://govspace.oregon.gov/community/agencies/das/geo/gpl/blog/2011/06/17/imagery-update-from-geo 
 
In the details, Erik notes that the 2009 WM is only cached to 1:36K (which is why Dorothy's example looks so bad). This is confirmed when you examine the REST endpoint for the service as the largest available scale is 1:36111. On the other hand the 2009 ORLAM is also 1:36K statewide but 1:2256K in PDX though Erik notes that he plans to do the whole state at this scale. So scale 1:2256 shows up via the REST endpoint even if the tiles aren't available everywhere.
 
 
 
Brady Callahan, GISP
GIS Program Leader
Oregon Parks & Recreation
725 Summer St NE, Ste C
Salem, OR 97301
brady.callahan at state.or.us 

ph. 503-986-0783
fax. 503-986-0792

>>> Dorothy Mortenson <mortendc at wrd.state.or.us> 7/20/2011 8:25 AM >>>
FYI:
 
Here are some examples of being able to zoom in with the aerial photos. It would be wonderful if the ESRI service would allow one or two more zoom levels in the rural areas. If there are any other web services I should be aware of (using projection 102100), please let me know.
Dorothy 
 
ESRI image service: 
http://services.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer
In urban areas, we can zoom in closer. In rural areas, we cannot zoom to the same scale as urban areas.
Roughly:
1.2" = 100 ft in urban areas
1.5" = 500 ft in rural areas
 
This is the esri web service as far as it can zoom in a rural area (near La Grande):

 
 
For GEO, we can zoom to whatever scale we need, but the quality is very poor.

http://navigator.state.or.us/ArcGIS/rest/services/BaseMaps/BaseMap_Imagery2009_WM/MapServe
 
This is the same area and zoom using the GEO 2009 imagery (in projection 102100). It's not even recognizable.
 

 
--------------------------------------------------------------------------------
Dorothy Mortenson
Oregon Water Resources Department
(503)986-0857
 
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