On Thu, Apr 6, 2017 at 5:20 PM, Lonnie Matsuno <[email protected]>
wrote:
> I'm having problems reprojecting an ImageMosaic layer from EPSG:6343 to
> EPSG:4326. I am using the 2.11.0 war on Ubuntu 16.04 / Tomcat8.
>
>
>
> In ArcMap when I reproject the source image with a transformation
> dx=0.995600 dy=-1.901300 dz=-0.521500 rx=0.025915 ry=0.009426, s=0.000620,
> I get a correct reprojection when comparing to an independent control
> shapefile.
>
>
>
> However, from Geoserver wms I see a shift of between 1 and 4 metres. I saw
> this post http://osgeo-org.1560.x6.nabble.com/custrom-CRS-
> transformation-parameters-are-still-intact-td5135625.html and it seems to
> be similar my issue.
>
>
>
> I tried overriding 6343 (adding the above parameters to TOWGS84) as
> described in the docs. Using a custom CRS in user_projections/epsg.properties
> reduced the shift amount, but is still off by ~1m.
>
Did you actually override it? That requires setting up something in
epsg_override.properties, and if you are down to 1m and
need better, you might need grid shift files. See documentation here:
http://docs.geoserver.org/latest/en/user/configuration/crshandling/customcrs.html#override-an-official-epsg-code
http://docs.geoserver.org/latest/en/user/configuration/crshandling/coordtransforms.html
Finally, since we are speaking about very small offsets (in geographical
terms), it might also be related to the image processing itself..
what's the native resolution of your data?
Regards
Andrea
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