[MS4W-Users] [mapserver-users] Mapcache WMTS - imagery is offset in ArcGIS when using WMTS services.

[Mark Volz]

Steve,

Thank you for your reply.  When I changed the Mapcache projection to WGS84 the basemap did display in the correct location.  However, when using UTM 15 (SRS 26915), and Lyon County MN Coordinates (103749) the image is still offset.  What I find unusual is that when using WMS instead of WMTS the maps display in the correct location no matter what projection I am using.

Test Results for the service called "TestLyonBasemap" on http://geomoose.lyonco.org/mapcache/wmts/1.0.0/WMTSCapabilities.xml
WMTS:  WGS84 - pass, Lyon County Coordinates 103749 - fail, UTM 15 - fail.
WMS:  WGS84 - pass, Lyon County Coordinates 103749 - pass, UTM 15 - pass

I am not sure if I have something configured incorrectly, if there is a bug in MS4W 3.3.0, or if there is a limitation in WMTS when using UTM or Lyon County projections.  Please let me know if you have any thoughts.

Thank You!

[cid:image001.jpg at 01D4F371.87141000]





Sincerely,
Mark Volz, GISP
Lyon County GIS Coordinator

From: Lime, Steve D (MNIT) <steve.lime at state.mn.us>
Sent: Friday, April 12, 2019 5:00 PM
To: Mark Volz <MarkVolz at co.lyon.mn.us>; mapserver-users at lists.osgeo.org
Subject: RE: [mapserver-users] Mapcache WMTS - imagery is offset in ArcGIS when using WMTS services.

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The resolution doesn't matter. That just impacts scale computations internally so when layers/classes are on/off and how symbol/font scaling is done.

I just tried our Compass MapCache/WTMS service overlaid with a shapefile in UTM projected appropriately and they line up perfectly in ArcGIS 10.6. You can try it too with your data since you're in MN (http://maps1.dnr.state.mn.us/mapcache/wmts/1.0.0/WMTSCapabilities.xml). Does it behave any differently for you?

--Steve

From: mapserver-users [mailto:mapserver-users-bounces at lists.osgeo.org] On Behalf Of Mark Volz
Sent: Friday, April 12, 2019 12:08 PM
To: mapserver-users at lists.osgeo.org<mailto:mapserver-users at lists.osgeo.org>
Subject: [mapserver-users] Mapcache WMTS - imagery is offset in ArcGIS when using WMTS services.

Hello,

I noticed that WMTS services are extremely fast when using Mapcache to serve tiles to ArcGIS clients.  However, the imagery appears to be shifted down significantly from the actual location.   I did notice that Mapserver and Mapcache use a 72 DPI while ArcGIS is using a 90.714 DPI.  In addition the image is the correct width and height.  In addition, when I use WMS the imagery appears in the correct location, however it is not as fast as WMTS.

Please let me know if there is a way to get ArcGIS to place imagery in the correct location when using WMTS and Mapcache.

Thanks

Sincerely,
Mark Volz, GISP
Lyon County GIS Coordinator

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