[gpl_list] Aerial Photo web services

[SMITH Cy * EISPD GEO]

Thank Brady, this came through right after I sent my message.  Glad to
hear the explanation.  Erik is on vacation for a couple weeks, I'm sure
he'll respond, too, when he returns.

cy

 

Cy Smith, Oregon State GIO

DAS/EISPD Geospatial Enterprise Office

President, Urban/Regional Info Sys Assoc. (URISA)

Secretary, Coalition of Geospatial Organizations (COGO)

Past President, Natl. States Geographic Info. Council (NSGIC)

503-378-6066          http://gis.oregon.gov 

 

From: gpl_list-bounces at listsmart.osl.state.or.us
[mailto:gpl_list-bounces at listsmart.osl.state.or.us] On Behalf Of Brady
Callahan
Sent: Wednesday, July 20, 2011 9:43 AM
To: Erik ENDRULAT; gpl_list at listsmart.osl.state.or.us; Matthieu
Denuelle; Dorothy Mortenson; Ken Smith; tchaddad at gmail.com
Subject: Re: [gpl_list] Aerial Photo web services

 

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/MapS
erver

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_Image
ry2009_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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