I try to avoid scales because they involve multiplying by that magic
number and are difficult to do reality checks on.
My suggestion would be to take a single tile from ESRI, find out what
it's width is (both in terms of pixels, and in term of units in the
coordinate system). Use that to find the resolution of the tile (and
thus, the resolution of a level in the pyramid) and take it from there.
If that's all square, then make sure the bounds match. There's a
potential issue if ESRI aligns tiles to a different corner than GWC,
though this can perhaps be adjusted using
"<http://geowebcache.org/schema/docs/1.2.2/http___geowebcache.org_schema_1.2.2/complexType/gridSet.html>alignTopLeft"
(in XML, not in Geoserver GUI).
-Arne
On 8/16/12 24:01 , Michael Smith wrote:
Arne,
Thank you for the reference to the WMS standard. Saw my assumption of what
pixelSize meant was not what I thought it was.
The API I am using (ESRI Flex) requires levels to be defined using both scale
and resolution. Since the applications I am working with to create tiles use
either scale or resolution to determine levels (trying to see which I can get
to work first), I thought that might be key to the resolution errors I saw in
HTTPFox.
I calculated the resolutions using the Tile Matrix Set section of the GeoServer
Grid Sets manager. If I defined the GeoServer tile levels by scale, the
resolutions did not match our current ArcGIS tile level resolutions.
Conversely, if I defined the tile levels by resolution, the scales did not
match. Since I am trying to layer GeoServer tile services on top of ArcGIS
basemap tile services I thought those discrepancies were the issue. Based on
the new information you provided it seems I need to do a bit more poking around
online.
- Michael
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