WMS server time tests and issues

Mon Nov 8 18:40:37 EST 2004

> -----Original Message-----
> From: Yewondwossen Assefa [mailto:assefa at dmsolutions.ca] 
> Sent: Monday, 08 November, 2004 18:37
> To: Kralidis,Tom [Burlington]
> Cc: MAPSERVER-DEV at LISTS.UMN.EDU
> Subject: Re: [UMN_MAPSERVER-DEV] WMS server time tests and issues
> 
> 
> Kralidis,Tom [Burlington] wrote:
> 
> >>-----Original Message-----
> >>From: Yewondwossen Assefa [mailto:assefa at dmsolutions.ca]
> >>Sent: Monday, 08 November, 2004 16:00
> >>To: Kralidis,Tom [Burlington]
> >>Cc: MAPSERVER-DEV at LISTS.UMN.EDU
> >>Subject: Re: [UMN_MAPSERVER-DEV] WMS server time tests and issues
> >>
> >>
> >>Kralidis,Tom [Burlington] wrote:
> >>
> >>>Hi,
> >>>
> >>>I've been testing this out on latest CVS.  Observations:
> >>>
> >>>- OS: FC2
> >>>Linux devgeo.cciw.ca 2.6.5-1.358smp #1 SMP Sat May 8
> >>
> >>09:25:36 EDT 2004
> >>
> >>>i686 i686 i386 GNU/Linux
> >>>- httpd: Apache 2.0.49
> >>>
> >>>I constructed a dummy .shp/.shx/.dbf with 4 columns 3
> >>
> >>records with a
> >>
> >>>timefield.
> >>>
> >>>Here's a dump of what the shapefile is:
> >>>
> >>>stid | lat          | lon        | obsdate
> >>>----------------------------------------------
> >>>tom  | 45.412766    | -71.920082 | 2004-10-12
> >>>bob  | 45.399400    | -75.704200 | 2003-09-30
> >>>joe  | 55.399400    | -95.704200 | 2002-03-17
> >>>
> >>>
> >>>...and here's the time defines in LAYER/METADATA in mapfile:
> >>>
> >>>   "wms_timeextent" "2002-03-17/2004-10-12"
> >>>   "wms_timedefault" "2003-09-30"
> >>>   "wms_timeitem" "obsdate"
> >>>
> >>>
> >>>...and here's my tests:
> >>>
> >>>Single value:
> >>>
> >>>
> >>
> >>http://devgeo.cciw.ca/cgi-bin/mapserv/ecows?version=1.1.1&se
> rvice=WMS&
> >>
> >>>re
> >>>
> >>
> >>quest=GetMap&layers=obs&format=image/gif&srs=EPSG:4326&transpa
> >>rent=TRUE&
> >>
> >>exceptions=application%2Fvnd.ogc.se_inimage&bbox=-140.243500,2
> > 
> > 8.606653,-
> > 
> >>51.243500,81.998653&width=500&height=300&time=2004-10-12-T00:0
> >>0:00&style
> >>
> >>>s=default
> >>>
> >>>Result: no problem, as expected
> >>>
> >>>Multple value:
> >>>
> >>>
> >>
> >>http://devgeo.cciw.ca/cgi-bin/mapserv/ecows?version=1.1.1&se
> rvice=WMS&
> >>
> >>>re
> >>>
> >>
> >>quest=GetMap&layers=obs&format=image/gif&srs=EPSG:4326&transpa
> >>rent=TRUE&
> >>
> >>exceptions=application%2Fvnd.ogc.se_inimage&bbox=-140.243500,2
> > 
> > 8.606653,-
> > 
> >>51.243500,81.998653&width=500&height=300&time=2004-10-12-T00:0
> >>0:00,2003-
> >>
> >>>09-30-T00:00:00&styles=default
> >>>
> >>>Result: no problem, as expected
> >>>
> >>>Single range:
> >>>
> >>>
> >>
> >>http://devgeo.cciw.ca/cgi-bin/mapserv/ecows?version=1.1.1&se
> rvice=WMS&
> >>
> >>>re
> >>>
> >>
> >>quest=GetMap&layers=obs&format=image/gif&srs=EPSG:4326&transpa
> >>rent=TRUE&
> >>
> >>exceptions=application%2Fvnd.ogc.se_inimage&bbox=-140.243500,2
> > 
> > 8.606653,-
> > 
> >>51.243500,81.998653&width=500&height=300&time=2002-03-17-T00:0
> >>0:00/2004-
> >>
> >>>10-12-T00:00:00&styles=default
> >>>
> >>>
> >>>Result: when the start time or end time is out of range of the
> >>>default. For example, if you change the start year to 2001, 
> >>
> >>only one
> >>
> >>>point shows
> >>>up:
> >>>
> >>>
> >>
> >>http://devgeo.cciw.ca/cgi-bin/mapserv/ecows?version=1.1.1&se
> rvice=WMS&
> >>
> >>>re
> >>>
> >>
> >>quest=GetMap&layers=obs&format=image/gif&srs=EPSG:4326&transpa
> >>rent=TRUE&
> >>
> >>exceptions=application%2Fvnd.ogc.se_inimage&bbox=-140.243500,2
> > 
> > 8.606653,-
> > 
> >>51.243500,81.998653&width=500&height=300&time=2001-03-17-T00:0
> >>0:00/2004-
> >>
> >>>10-12-T00:00:00&styles=default
> >>>
> >>>...so it looks like the default is returned when the range given is
> >>>outside the range defined in "wms_timeextent".
> >>>
> >>>Is this the expected behaviour?  As a WMS client, I would
> >>
> >>expect that
> >>
> >>>temporal queries would return everything inside two given
> >>
> >>dates, just
> >>
> >>>like a spatial query does.
> >>>
> >>>..Tom
> >>>
> >>>
> >>
> >>I think that the specs indicates that if the given values are
> >>"incorrect" the server would return values for the default 
> declared :
> >>
> >>Section C5.1 (Annexe C wms 1.1.1 ):
> >>" ...An OGC Web Service may declare a default for any dimension. A
> >>'default' is optional but recommended. If a request does not 
> >>include a 
> >>value along this dimension, and a default has been 
> declared, then the 
> >>server shall send the default value..."
> >>
> >>  The implementation was the interpretation of this text.
> >>
> > 
> > 
> > Thanks for the clarification -- being a spec zealot I 
> should have read 
> > up on this!!
> > 
> > At any rate, if I comment out "wms_timedefault", and I specify:
> > 
> > 
> http://devgeo.cciw.ca/cgi-bin/mapserv/ecows?version=1.1.1&service=WMS&
> > re
> > 
> quest=GetMap&layers=obs&format=image/gif&srs=EPSG:4326&transpa
> rent=TRUE&
> > 
> exceptions=application%2Fvnd.ogc.se_inimage&bbox=-140.243500,2
8.606653,-
> > 
> 51.243500,81.998653&width=500&height=300&time=2002-03-17-T00:0
> 0:00/2004-
> > 10-12-T00:00:00&styles=default
> >  
> > ...it works as expected.  If I specify a range outside the time 
> > extents,
> > i.e.:
> > 
> > 
> http://devgeo.cciw.ca/cgi-bin/mapserv/ecows?version=1.1.1&service=WMS&
> > re
> > 
> quest=GetMap&layers=obs&format=image/gif&srs=EPSG:4326&transpa
> rent=TRUE&
> > 
> exceptions=application%2Fvnd.ogc.se_inimage&bbox=-140.243500,2
8.606653,-
> > 
> 51.243500,81.998653&width=500&height=300&time=2001-03-17-T00:0
> 0:00/2004-
> > 10-12-T00:00:00&styles=default
> > 
> > I get prompted to download image/tiff.  What happens in this case?
> > 
> 
> It should normally send an exception of this nature :
> 
> <?xml version='1.0' encoding="ISO-8859-1" standalone="no" ?> 
> <!DOCTYPE ServiceExceptionReport SYSTEM 
> "http://ogc.dmsolutions.ca/wms/1.1.1/exception_1_1_1.dtd">
> <ServiceExceptionReport version="1.1.1">
> <ServiceException code="InvalidDimensionValue">
> msWMSApplyTime: WMS server error. Time value(s) 2003-01-01 
> 14:10 given 
> is invalid or outside the time extent defined 
> (2004-01-01/2004-02-01). </ServiceException> </ServiceExceptionReport>
> 
> Not sure where the image/tiff comes from.
>

For WCS support, I have an OUTPUTFORMAT object defined:

 OUTPUTFORMAT
  NAME GEOTIFF_RGB
  DRIVER "GDAL/GTiff"
  MIMETYPE "image/tiff"
  IMAGEMODE RGB
  EXTENSION "tif"
 END

...when I commented this out, I get the error message as per above, so
that's good.

So why is the OUTPUTFORMAT object messing things up?

..Tom

> Later,
> 
> -- 
> ----------------------------------------------------------------
> Assefa Yewondwossen
> Software Analyst
> 
> Email: assefa at dmsolutions.ca
> http://www.dmsolutions.ca/
> 
> Phone: (613) 565-5056 (ext 14)
> Fax:   (613) 565-0925
> ----------------------------------------------------------------
> 
> 
> 