WMS server time tests and issues

Mon Nov 8 18:52:47 EST 2004

Kralidis,Tom [Burlington] wrote:

>
>>-----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?
>

I just did a quick test on windows using latest cvs (and the
outputformat set to tiff) and I get the usual mapserv.exe download with
the exception in it.  Do you get the same result for other wms
exceptions ? (the time exception is not set diffrently from other wms
excpetions)

--
----------------------------------------------------------------
Assefa Yewondwossen
Software Analyst

Email: assefa at dmsolutions.ca
http://www.dmsolutions.ca/

Phone: (613) 565-5056 (ext 14)
Fax:   (613) 565-0925
----------------------------------------------------------------