[OpenLayers-Dev] ArcGIS server 9.2 support for OL
mpriour at kestrelcomputer.com
Fri May 16 12:21:58 EDT 2008
We have actually used it in 2 applications to great success. Though we did
have to get some help from the author to properly configure some of the
parameters on a near polar projection system.
There was no significant difference in performance between this and any
other pre-rendered tile retrival layer.
Kestrel Computer Consulting
Christopher Schmidt-4 wrote:
> On Fri, May 16, 2008 at 07:38:26AM -0700, Yeroc wrote:
>> Did this patch make it into OpenLayers? I'm interested in this
>> functionality and wonder if it's now a standard part of OpenLayers and if
>> not, why not? I didn't see any followups to this initial email...?
> I never had a server I could test against, or anyone who confirmed it
> worked other than stvn, and with only that reassurance, I wasn't
> prepared to put it in trunk.
> It was in a sandbox of stvn's somewhere, I think, but I don't know
> where. The FAQ might mention it.
> -- Chris
>> Steven M. Ottens-3 wrote:
>> > Hi all,
>> > With some help of Chris I've managed to access the tiles generated by
>> > ArcGIS server 9.2.
>> > There's a public accessible server at:
>> > http://serverx.esri.com/antialiasingexamples/
>> > ArcGIS server stores its prerendered tiles in a directory structure
>> > similar to TMS:
>> > layername/zoomlevel/rownumber/columnnumber.filetype:
>> > It also has an XML providing some extra data:
>> > The row number and column number are stored in hexadecimal and are
>> > calculated from the TileOrigin (upper left).
>> > attached is a zip with two files and one patch:
>> > ags2.html goes into examples and provides an example with the data of
>> > above mentioned site
>> > AGS.js goes into lib/OpenLayers/Layer and provides the logic for the
>> > tile-url calculation
>> > openlayers.diff adds AGS.js to OpenLayers.js
>> > There's one major issue: you need specify the correct maxExtent to make
>> > sure that no tiles are requested outside the realm of the cache. Also
>> > this maxExtent should be a perfect fit for the tiles otherwise a weird
>> > offset is shown when zooming in and out. (I haven't calculated the
>> > proper extent yet, so one can see this erratic behavior).
>> > Regards,
>> > Steven
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> Christopher Schmidt
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