[OpenLayers-Users] Using Openlayers with Tile and Export Image doesnt "overlap"

[Christopher Schmidt]

On Thu, Aug 13, 2009 at 05:05:18AM -0500, RajeevSharma wrote:
> 
> Hello, 
> I am using Open Layers for the first time, and would like to display maps
> from multiple services. 
> 
> 1. A Tiled map service which forms the background. 
> 2. One or more Dynamic map services which will be used to overlay on top of
> the first service. 
> 
> I am using the XYZ and ArcGIS93Rest respectively to do the same. The maps do
> display but their images arent synchronised. Meaning, the tiled layer image
> comes up on the top left part of the screen, and the export map from the
> Rest service comes up in the centre and larger than the tiled map.
> 
> I tried tweaking around with the resolution param which didnt help much. The
> maps moved a bit closer until 4000 then they started moving apart. Setting
> this to "auto" didnt help either. The SRS is the same for both services. As
> are the map initial and final extents. 
> 
> Can any one please let me know if I am doing something wrong out here?

the XYZ layer requires you to have correct maxExtent and maxResolution
properties matchingthe grid set up in the tile cache creation configuration.
Without this information, they will not line up. Your Tile Cache metadata
may provide this information, or you may need to consult some othr resource
to find it. Sharing a link to the tiles you are trying to use, as well as
the code you are using to try to use thm, may be helpful.

Best Regards,
-- 
Christopher Schmidt
MetaCarta