WCS Server - Map Level Projection Object Potential Bug

[loisg00]

Hi,

The issue was first described here : ​http://lists.osgeo.org/pipermail/mapserver-users/2011-November/070672.html

You might want to take a look if you are in need of any information I could have missed. I'll try to cover everything here, of course.

OS : Windows XP MapServer version : 6.0.1, prebuilt from MS4W.

MapServer version 6.0.1 OUTPUT=GIF OUTPUT=PNG OUTPUT=JPEG OUTPUT=KML SUPPORTS=PR OJ SUPPORTS=AGG SUPPORTS=CAIRO SUPPORTS=FREETYPE SUPPORTS=ICONV SUPPORTS=FRIBIDI

SUPPORTS=WMS_SERVER SUPPORTS=WMS_CLIENT SUPPORTS=WFS_SERVER

SUPPORTS=WFS_CLIENT

SUPPORTS=WCS_SERVER SUPPORTS=SOS_SERVER SUPPORTS=FASTCGI SUPPORTS=THREADS

SUPPO RTS=GEOS INPUT=JPEG INPUT=POSTGIS INPUT=OGR INPUT=GDAL INPUT=SHAPEFILE

Faulty MapFile : ​http://lists.osgeo.org/pipermail/mapserver-users/attachments/20111104/78e5fa24/2011102811-0001.obj

Some GetCoverage requests along with their result :

​http://localhost/cgi-bin/mapserv.exe?SERVICE=WCS&map=D:/Guillaume/ProjetCourantsGlaces/WCSproblem/2011102811.map&COVERAGE=thelayer&VERSION=1.0.0&REQUEST=GetCoverage&BBOX=-67.5,48.922499263758255,-64.6875,50.736455137010665&CRS=EPSG:4326&WIDTH=256&HEIGHT=256&FORMAT=GTiff

(with or without "&RESPONSE_CRS=EPSG:4326", the native projection) Gives the following error :

<?xml version='1.0' encoding="ISO-8859-1" ?> <ServiceExceptionReport version="1.2.0" xmlns="​http://www.opengis.net/ogc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.opengis.net/ogc ​http://schemas.opengis.net/wcs/1.0.0/OGC-exception.xsd">

<ServiceException code="NoApplicableCode" locator="bbox">msWCSGetCoverage(): WCS server error. Requested BBOX (-178.835708198757,2803.05273104522,179.552848002437,2906.98474680556) is outside requested coverage BBOX (-70,45,-55,52) </ServiceException>

</ServiceExceptionReport>

Notice how the Requested BBOX in the error doesn't make sense.

Adding "&RESPONSE_CRS=EPSG:900913" (or 3857) instead to the request should logically still give an error, because the BBOX itself isn't changed (it's the response_CRS, not the CRS...). Yet, it returns a geotiff. The file is all black (0 0 0), though :

​http://lists.osgeo.org/pipermail/mapserver-users/attachments/20111104/78e5fa24/wcsoutput-0001.tif

My inability to create a correct GeoTiff output was the original issue. Rahkonen Jukka found the solution : Adding a projection object to the layer level allowed me to get a good GeoTiff, similar to the one obtained with a WMS request (​http://lists.osgeo.org/pipermail/mapserver-users/attachments/20111104/78e5fa24/wmsoutput-0001.tif).

PROJECTION

'init=epsg:4326'

END

However, this is an unexpected behaviour. The Map level projection object should be used when the layer is lacking one. I've been asked to create a ticket regarding the issue.

​http://lists.osgeo.org/pipermail/mapserver-users/2011-November/070700.html

Although the original problem was about GeoTiff, it can probably be extended to other output formats.

The HDF5 source file can be found here : ​http://lists.osgeo.org/pipermail/mapserver-users/attachments/20111104/78e5fa24/data-0001.obj

The problem may or may not be specific to this input format. I don't know how MapServer handles this.

Logs produced by MapServer for several requests seen in this ticket are here : ​http://lists.osgeo.org/pipermail/mapserver-users/attachments/20111104/78e5fa24/mapserv_errors-0001.obj

I tried to fit in as much information as I could. I'm sorry if I forgot something or haven't respected conventions I was unaware of. You can contact me if you need to at loiselle.guillaume@… .

Guillaume Loiselle

P.S. The "New Ticket" link found in the sentence "To enter an issue use the New Ticket button." from ​http://trac.osgeo.org/mapserver/ redirects to ​http://trac.osgeo.org/mapserver/mapserver/newticket, which is wrong and gives this error :

Error: Not Found

No handler matched request to /mapserver/newticket

The correct URL is ​http://trac.osgeo.org/mapserver/newticket. Is there a metaticket system to create tickets on ticket issues? :p

[loisg00]

Replying to loisg00:

Another user had an issue with projection within the WCS server. It shares some similarities with mine and could have the same source. I'm adding a link to this discussion and I will invite him to add more information here himself :

​http://lists.osgeo.org/pipermail/mapserver-users/2011-November/070872.html