[OpenLayers-Users] [Tilecache] Building static tilecache with ESRI software

[Björn Harrtell]

Recently http://svn.openlayers.org/trunk/openlayers/lib/OpenLayers/Layer/ArcGIS93Rest.js
was added to the openlayers trunk version, might we worth checking
out. I'm not sure how fitting the AGS REST-interface is for cached
services though.

I think there is some WIP in consuming an ArcGIS Server cache directly
via openlayers too, but you should ask the openlayers list about that.

The third option I see, converting an ArcGIS Server cache to the
structure used by tilecache wouldn't be extremely hard to do, but
noone has done that yet afaik.

/Björn

On Wed, Feb 25, 2009 at 18:40, Eric Wolf <ebwolf at gmail.com> wrote:
> I'm trying to figure out the easiest/best way to create a static tile
> cache (prerendered) of a map layout created in ArcGIS to be accessed
> using OpenLayers.
>
> Here's the background: The current USGS real time earthquake website
> uses pre-rendered maps using circa 1995 technology. These maps get
> rendered as static graphic files on a system at the Survey and then
> copied to servers at Akamai. This works well because immediately
> following any decent quake, traffic to this site jumps to
> hundreds-of-thousands of hits per second.
>
> The basemaps for the rendering code are basically a collection of
> static graphics exported from ArcGIS. The basemap symbology has been
> carefully constructed for this purpose by real cartographers.
>
> I'm trying to figure out the best way to assemble a more dynamic
> website - but a typical ArcServer->Web Browser or
> GeoServer->OpenLayers system won't be able to scale to the kind of
> traffic seen immediately following a quake. The
> GeoServer->Tilecache->OpenLayers is an obvious step in the direction
> we need to go - but I don't really want to have to replicate the
> ArcGIS symbology in GeoServer (or Mapnik or MapServer).
>
> So I'm trying to figure out if I use ArcServer to generate a static
> tilecache (i.e., the collection of 256x256 png files), how can I
> access it via OpenLayers?
>
> One possibility is to try to get the AGS extension to OpenLayers
> working (which seems to be abandoned). Another is to kludge
> TileCache.cgi for the directory structure generated by ArcServer's
> tile cache seeding. And yet another is to try to restructure the tiles
> generated by ArcServer in a way that TileCache.cgi likes.
>
> Any help is much appreciated.
>
> -Eric
>
> -=--=---=----=----=---=--=-=--=---=----=---=--=-=-
> Eric B. Wolf                          720-209-6818
> USGS Geographer
> Center of Excellence in GIScience
> PhD Student
> CU-Boulder - Geography
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