[mapserver-users] WMTS tiles not at correct Latitude (and moving)

[Ben Madin]

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