Yes, it is 6343 is overridden, as I can see the TOWGS84 parameters in the SRS
List in the GS gui. Also, I have changed the parameters and I can see the WMS
response image move relative to the control points.
The native projection for my geoserver layer is EPSG:6343. It seems my problem
may be either getting the parameters right, or as you suggest using a more
elaborate transformation.
Thanks.
Lonnie
________________________________
From: [email protected] [[email protected]] on behalf of Andrea Aime
[[email protected]]
Sent: April 7, 2017 12:01 PM
To: Lonnie Matsuno
Cc: [email protected]
Subject: Re: [Geoserver-users] NAD83 (2011) to WGS84 Transformation
On Thu, Apr 6, 2017 at 5:20 PM, Lonnie Matsuno
<[email protected]<mailto:[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
--
==
GeoServer Professional Services from the experts! Visit
http://goo.gl/it488V for more information.
==
Ing. Andrea Aime
@geowolf
Technical Lead
GeoSolutions S.A.S.
Via di Montramito 3/A
55054 Massarosa (LU)
phone: +39 0584 962313
fax: +39 0584 1660272
mob: +39 339 8844549
http://www.geo-solutions.it
http://twitter.com/geosolutions_it
AVVERTENZE AI SENSI DEL D.Lgs. 196/2003
Le informazioni contenute in questo messaggio di posta elettronica e/o nel/i
file/s allegato/i sono da considerarsi strettamente riservate. Il loro utilizzo
è consentito esclusivamente al destinatario del messaggio, per le finalità
indicate nel messaggio stesso. Qualora riceviate questo messaggio senza esserne
il destinatario, Vi preghiamo cortesemente di darcene notizia via e-mail e di
procedere alla distruzione del messaggio stesso, cancellandolo dal Vostro
sistema. Conservare il messaggio stesso, divulgarlo anche in parte,
distribuirlo ad altri soggetti, copiarlo, od utilizzarlo per finalità diverse,
costituisce comportamento contrario ai principi dettati dal D.Lgs. 196/2003.
The information in this message and/or attachments, is intended solely for the
attention and use of the named addressee(s) and may be confidential or
proprietary in nature or covered by the provisions of privacy act (Legislative
Decree June, 30 2003, no.196 - Italy's New Data Protection Code).Any use not in
accord with its purpose, any disclosure, reproduction, copying, distribution,
or either dissemination, either whole or partial, is strictly forbidden except
previous formal approval of the named addressee(s). If you are not the intended
recipient, please contact immediately the sender by telephone, fax or e-mail
and delete the information in this message that has been received in error. The
sender does not give any warranty or accept liability as the content, accuracy
or completeness of sent messages and accepts no responsibility for changes
made after they were sent or for other risks which arise as a result of e-mail
transmission, viruses, etc.
-------------------------------------------------------
------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot
_______________________________________________
Geoserver-users mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/geoserver-users
