WMS server time tests and issues

[Kralidis,Tom [Burlington]]

> -----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&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=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&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=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&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
> > 
> > 
> > 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&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
> > 
> > ...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&transparent=TRUE&
exceptions=application%2Fvnd.ogc.se_inimage&bbox=-140.243500,28.606653,-
51.243500,81.998653&width=500&height=300&time=2002-03-17-T00:00:00/2004-
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&transparent=TRUE&
exceptions=application%2Fvnd.ogc.se_inimage&bbox=-140.243500,28.606653,-
51.243500,81.998653&width=500&height=300&time=2001-03-17-T00:00:00/2004-
10-12-T00:00:00&styles=default

I get prompted to download image/tiff.  What happens in this case?

..Tom


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