[mapserver-users] WCS 1.0 vs 1.1 image shifted

[Lime, Steve D (DNR)]

Like I said in the referenced message, I thought all was well in this regard. We'd need a good test case (data, mapfile, 1.0/1.1 requests) attached to a ticket. If there's a difference in the pixel models between WCS 1.0 and 1.1 then a request that differs only in version might be expected to generate slightly different output. I haven't looked at those specs in a good while though.

Steve
 
________________________________________
From: mapserver-users-bounces at lists.osgeo.org [mapserver-users-bounces at lists.osgeo.org] On Behalf Of Roger André [randre at gmail.com]
Sent: Sunday, May 02, 2010 11:45 AM
To: Ben Tuttle
Cc: mapserver-users at lists.osgeo.org
Subject: Re: [mapserver-users] WCS 1.0 vs 1.1 image shifted

Hi Ben,

I think it's a bug, at least based on the conversation that took place last year with Steve Lime regarding this - http://www.mail-archive.com/mapserver-users@lists.osgeo.org/msg06123.html

I'm not sure what the current state is of this though.

Roger
--

On Fri, Apr 30, 2010 at 1:18 PM, Ben Tuttle <benjamin.tuttle at gmail.com<mailto:benjamin.tuttle at gmail.com>> wrote:
I am trying to understand the results I am getting from WCS requests
to MapServer.
If I make the same request changing only the WCS version the images I
get back are shifted by 1 pixel in the x and y directions. A request
for VERSION=1.1.0 gives me the image I expect while VERSION=1.0.0
gives me back an image shifted by 1 pixel in the x and y directions to
the North and West.
The underlying data and mapfile are the same in both cases. So I am
not sure if this is perhaps a MapServer bug or if perhaps I am reading
the WCS spec incorrectly and this is actually the intended result (I
hope it's not). Can anyone help me out?

Request Examples:
http://map.ngdc.noaa.gov/cgi-bin/mapserver/test_image_ms_wcs100_avgvis42_23_47_28.tif?map=../../../nfs/gisdata/mapserver/gcv4/index.map&request=GetCoverage&service=WCS&COVERAGE=F162008_v4_avg_vis&crs=EPSG:4326&VERSION=1.0.0&format=geotiff&resx=0.0083333333&resy=0.0083333333&bbox=42,23,47,28

http://map.ngdc.noaa.gov/cgi-bin/mapserver/test_image_ms_wcs110_avgvis42_23_47_28.tif?map=../../../nfs/gisdata/mapserver/gcv4/index.map&request=GetCoverage&service=WCS&COVERAGE=F162008_v4_avg_vis&crs=EPSG:4326&VERSION=1.1.0&format=geotiff&resx=0.0083333333&resy=0.0083333333&bbox=42,23,47,28


System Details:
MapServer version 5.6.3 OUTPUT=GIF OUTPUT=PNG OUTPUT=JPEG OUTPUT=WBMP
OUTPUT=SVG SUPPORTS=PROJ SUPPORTS=AGG SUPPORTS=FREETYPE SUPPORTS=ICONV
SUPPORTS=WMS_SERVER SUPPORTS=WMS_CLIENT SUPPORTS=WFS_SERVER
SUPPORTS=WFS_CLIENT SUPPORTS=WCS_SERVER SUPPORTS=SOS_SERVER
SUPPORTS=THREADS SUPPORTS=GEOS INPUT=TIFF INPUT=EPPL7 INPUT=POSTGIS
INPUT=ORACLESPATIAL INPUT=OGR INPUT=GDAL INPUT=SHAPEFILE

Red Hat Enterprise Linux Server release 5.5 (Tikanga)

--
Cheers, Ben Tuttle
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