From: Tim Spivey
Sent: Friday, May 04, 2012 9:13 AM
To: 'Andrea Aime'
Cc: [email protected]
Subject: followup - rookie question about WMS rasters
Ti ringrazio
Please excuse my ignorance on this subject; I need to ask for a
clarification.
ArcView can read raster images in all SRSs - but you said to be sure it
can "ask GeoServer to do the reprojection". By that, do you mean that
ArcView must initiate (request) the reprojection process each time it
needs the imagery? Or can one set GeoServer so that it provides a
constant stream of reprojected data?
Let me give an analogy - does GeoServer function like a spring flowing
continually from the ground, or like a kitchen faucet which must be
turned on each time a cup of water is needed?
Here is the way we would hope that GeoServer could be used:
<raster from WMS subscription service> -----> <GeoServer reprojection>
-----> <raster in ArcView3>
- Tim
From: [email protected] [mailto:[email protected]] On Behalf Of
Andrea Aime
Sent: Friday, May 04, 2012 2:09 AM
To: Tim Spivey
Cc: [email protected]
Subject: Re: [Geoserver-users] rookie question about WMS rasters
On Wed, May 2, 2012 at 9:34 PM, Tim Spivey <[email protected]>
wrote:
Greetings from a GeoServer newbie -
My question is:
If we access WMS raster imagery (which is in Mercator projection
EPSG:3857) using GeoServer, can we set GS to reproject the imagery into
State Plane GA West NAD83 for use in ArcView 3x?
Then will GS "re-serve" the WMS imagery on demand as a user pans/zooms?
The reason for the query - we're considering subscribing to the new
Bing/DigitalGlobe 30cm imagery via WMS, and have 2 users with ArcView
3x, which can NOT do on-the-fly reprojection. Upgrading them to ArcGIS
9/10 is not an option for us.
The folks at MapSavvy WMS (OnTerra) suggested using a chain service such
as GeoServer.
GeoServer can do on the fly reprojection of raster data and can do so
over WMS services too, but before
investing into a subscription I would double check that:
- ArcView can actually request WMS layers in a SRS other than the native
one (that is, it can ask GeoServer
to do the reprojection)
- The output quality is suitable for your needs (reprojection often
comes with a reduced quality output)
Cheers
Andrea
--
Ing. Andrea Aime
GeoSolutions S.A.S.
Tech lead
Via Poggio alle Viti 1187
55054 Massarosa (LU)
Italy
phone: +39 0584 962313
fax: +39 0584 962313
mob: +39 339 8844549
http://www.geo-solutions.it
http://geo-solutions.blogspot.com/
http://www.youtube.com/user/GeoSolutionsIT
http://www.linkedin.com/in/andreaaime
http://twitter.com/geowolf
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