G’day all,

we have set up a map cache wmts layer to produce boundaries for our mapping 
system.

In isolation, it was looking OK, however when we layer the boundaries with any 
known background (OSM etc) they appear to be offset by a few degrees S (it is 
all in EPSG:3857)

To confuse things more, as we zoom in a couple of layers, this seems to be 
moving north (which is good), but not enough to converge with our background or 
data layers - so still bad.

I’ve put an image to illustrate this at :

https://s3-ap-southeast-2.amazonaws.com/uploads.ausvet.com.au/Misaligned-WMTS.png

My guess is I have done something wrong at some level of configuration (postgis 
data, mapfile, wms config, mapcache.xml or OpenLayers),  but it might be that 
it is common enough that most people can figure it out (which is why I couldn’t 
find a good reason!)

Any advice would be gratefully accepted. I can put up further details as 
required (or if it isn’t as simple as I thought)

cheers

Ben


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