WMS server time tests and issues

[Yewondwossen Assefa]

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&transparent=TRUE&
> exceptions=application%2Fvnd.ogc.se_inimage&bbox=-140.243500,28.606653,-
> 51.243500,81.998653&width=500&height=300&time=2004-10-12-T00:00:00&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&transparent=TRUE&
> exceptions=application%2Fvnd.ogc.se_inimage&bbox=-140.243500,28.606653,-
> 51.243500,81.998653&width=500&height=300&time=2004-10-12-T00:00:00,2003-
> 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&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
>
>
> 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&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
>
> ...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.



--
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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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