time series problem 3 (Bug!?)
Yewondwossen Assefa
assefa at DMSOLUTIONS.CA
Thu Oct 13 19:43:55 PDT 2005
Luis W. Sevilla wrote:
> Hi,
> Yewondwossen Assefa wrote:
>
>> From the specs (wms 1.1 annex c c.3), the extent could be defined in 4
>> ways :
>> 1) value : A single value. This is not directly supported in
>> Mapserver but there is an easy workwound by specifying the same value
>> as min and max
>>
>> 2) value1,value2,value3,... a A list of multiple values. This is
>> not supported in Mapserver.
>>
>> 3) min/max/resolution An interval defined by its lower and upper
>> bounds and its resolution. This is supported in Mapserver (Note
>> that the resolution is not supported)
>
>
> It sounds quite strange: how do you specify the ammount of time-slices,
> without giving the resolution?
>
You can specify the resolutions in your setting of the wms_timeextent
parameter. It should be dumped as is in the capabilities document. It
just won't be used when validating the time value passed in the request
to see if the value fits in the time extents defined. The validation
will only use the min max values.
>>
>> 4) min1/max1/res1,min2/max2/res2,... a A list of multiple
>> intervals. Not supported
>>
>>
>> I am willing to add the support for number 4) if you are willing to
>> do additional testing.
>
>
> We may do some testing too. we're on the way of developping a new WMS
> cliente with time parameter support, and also interested in publising
> multitemporal data on the same way.
> '
I have entred a bug on this issue so discussions/testing can be done
through this bug.
http://mapserver.gis.umn.edu/bugs/show_bug.cgi?id=1498
>>
>> I am not sure if 2) is is a must have at this point.
>>
>> Le me know what you think and then we can proceed with the impentation.
>>
>> Later,
>>
>>
>> Jeroen Ticheler wrote:
>>
>>> Thanks for that! Is it a complex thing to add such support? I had
>>> the impression from the code that it was virtually there already,
>>> just that it first checked for a range and does not proceed to check
>>> for ranges?
>>> The problem is that a range doesn't work for this series. Data comes
>>> in at three 10 daily periods a month, which is not exactly true as a
>>> month does not always have 30 days. Still the images are always
>>> dated with a 01, 11 and 21 for the day (or 1,2 or 3 for a dekad).
>>>
>>> Ciao,
>>> Jeroen
>>> _______________________
>>> Jeroen Ticheler
>>> FAO-UN
>>> Tel: +39 06 57056041
>>> http://www.fao.org/geonetwork
>>> 42.07436°N 12.34327°E
>>>
>>>
>>> On 13 Oct 2005, at 20:03, Yewondwossen Assefa wrote:
>>>
>>>> Hi There,
>>>>
>>>> Sorry for the late answer.
>>>>
>>>> From what I can see in your examples, you are running into a
>>>> limitation of mapserver and it's support for the time extent
>>>> values. Currently the time extent can only be defined as a range
>>>> value and only one range value is valid (so something like is the
>>>> only thing valid 2005-09-11/2005-09-21)
>>>>
>>>> You should update your "wms_timeextent" and try it with only one
>>>> range. I will enter documentation bug so that this limitation is
>>>> clearly defined. Give it a try and let me know.
>>>>
>>>> Later,
>>>>
>>>> Jeroen Ticheler wrote:
>>>>
>>>>> Hi, sorry for continuing this story, but I really want to solve
>>>>> this and hope my additional info helps to sort out the problems I
>>>>> face.
>>>>> I am using a shapefile with the imgdate column added to it. I use
>>>>> exactly the same index to work with a WCS on the same data, that
>>>>> one works perfectly fine.
>>>>> I have browsed through the mapServer sourcecode to see if I could
>>>>> discover something/ understand the problem better. I'm not
>>>>> familiar with C coding, so forgive my ignorance :-) What I could
>>>>> understand is that my request fails when the time string
>>>>> submitted in the request is compared to the timeextent given in
>>>>> the capabilities document.
>>>>> The exact section of the code is in between line 545 and line
>>>>> 569, apparently the msValidateTimeValue() procedure fails to find
>>>>> the requested date in the extent. I do not get an error when I
>>>>> change my extent to a range like
>>>>> "2005-09-11,2005-09-21/2005-09-21" or
>>>>> "2005-09-11,2005-09-11/2005-09-21", but it will only render the
>>>>> very last image, even when an earlier one is requested.
>>>>> So I guess I face a bug!?
>>>>> Thanks again,
>>>>> Jeroen
>>>>> Begin forwarded message:
>>>>>
>>>>>> From: Jeroen Ticheler <Jeroen.Ticheler at FAO.ORG>
>>>>>> Date: 12 October 2005 09:54:26 GMT+02:00
>>>>>> To: MAPSERVER-USERS at LISTS.UMN.EDU
>>>>>> Subject: [UMN_MAPSERVER-USERS] time series problem 2
>>>>>> Reply-To: Jeroen Ticheler <Jeroen.Ticheler at FAO.ORG>
>>>>>>
>>>>>>
>>>>>> Further to my previous message, the exception I get is the
>>>>>> following one:
>>>>>>
>>>>>> <ServiceExceptionReport version="1.1.1">
>>>>>> <ServiceException code="InvalidDimensionValue">
>>>>>> msWMSApplyTime: WMS server error. Time value(s) 2005-09-21 given
>>>>>> is invalid or outside the time extent defined
>>>>>> (2005-03-11,2005-03-21,2005-04-01,2005-04-11,2005-04-21,2005-05-01,2
>>>>>> 00
>>>>>> 5-05-11,2005-05-21,2005-06-01,2005-06-11,2005-06-21,2005-07-01,2005-
>>>>>> 07
>>>>>> -11,2005-07-21,2005-08-01,2005-08-11,2005-08-21,2005-09-01,2005-09-1
>>>>>> 1, 2005-09-21), and default time set is invalid (2005-09-21)
>>>>>> </ServiceException>
>>>>>> </ServiceExceptionReport>
>>>>>>
>>>>>> And the URL's I use are:
>>>>>>
>>>>>> For Capabilities:
>>>>>>
>>>>>> http://193.43.36.137/cgi-bin/spotveg?
>>>>>> version=1.1.1&service=WMS&request=GetCapabilities
>>>>>>
>>>>>> For a working map without specifying the time:
>>>>>>
>>>>>> http://193.43.36.137/cgi-bin/spotveg?
>>>>>> version=1.1.1&service=WMS&request=GetMap&srs=EPSG:
>>>>>> 4326&bbox=-180,-90,180,90&format=image/
>>>>>> png&layers=spotndvi&transparent=true&width=400&height=200
>>>>>>
>>>>>> For a request with a time, the exception is returned:
>>>>>>
>>>>>> http://193.43.36.137/cgi-bin/spotveg?
>>>>>> version=1.1.1&service=WMS&request=GetMap&srs=EPSG:
>>>>>> 4326&bbox=-180,-90,180,90&format=image/
>>>>>> png&layers=spotndvi&transparent=true&width=400&height=200&time=2005-
>>>>>> 09 -21
>>>>>>
>>>>>> These URL's can be reached from outside, so you can try this
>>>>>> yourself.
>>>>>> Thanks in advance for any help to a solution,
>>>>>> Jeroen
>>>>>>
>>>>>> On 11 Oct 2005, at 19:20, Jeroen Ticheler wrote:
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>> Hi,
>>>>>>> I have a problem with time series for WMS. I have used the
>>>>>>> following WMS attributes in my map file and I get the default
>>>>>>> image the first WMS map request. The moment I start requesting
>>>>>>> maps with the time variable set, I get an exception indicating
>>>>>>> that the time format used is not correct.
>>>>>>>
>>>>>>> The data is GeoTIFF
>>>>>>> I have an index shapefile with an imgdate column containing the
>>>>>>> dates in the same format
>>>>>>>
>>>>>>> Anyone an idea, I can't find an example that has a whole range
>>>>>>> of images with a specific time set for each image.
>>>>>>>
>>>>>>> Map file extract:
>>>>>>>
>>>>>>> At the map level (although I don't think this is supported/
>>>>>>> needed for GeoTIFF data!?)
>>>>>>> ____________________________
>>>>>>> "wms_timeformat" "YYYY-MM-DD"
>>>>>>> ____________________________
>>>>>>>
>>>>>>>
>>>>>>> At the layer level
>>>>>>> ____________________________
>>>>>>>
>>>>>>> "wms_style_default_title" "default"
>>>>>>> "wms_format" "image/png"
>>>>>>> "wms_timedefault" "2005-09-11"
>>>>>>> "wms_timeextent"
>>>>>>> "2005-08-21,2005-09-01,2005-09-11" # also tried with
>>>>>>> spaces after each comma
>>>>>>> "wms_timeitem" "imgdate"
>>>>>>>
>>>>>>> END
>>>>>>> DUMP TRUE
>>>>>>> TILEINDEX 'ndvi_idx'
>>>>>>> TILEITEM "location"
>>>>>>> EXTENT -180.0 -90.0 180.0 90.0
>>>>>>> PROJECTION "init=epsg:4326" END
>>>>>>> ____________________________
>>>>>>>
>>>>>>>
>>>>>>> Thanks in advance,
>>>>>>> Jeroen
>>>>>>> _______________________
>>>>>>> Jeroen Ticheler
>>>>>>> FAO-UN
>>>>>>> Tel: +39 06 57056041
>>>>>>> http://www.fao.org/geonetwork
>>>>>>> 12.34327°N 12.34327°E
>>>>>>
>>>>>>
>>>> ----------------------------------------------------------------
>>>> Assefa Yewondwossen
>>>> Software Analyst
>>>>
>>>> Email: assefa at dmsolutions.ca
>>>> http://www.dmsolutions.ca/
>>>>
>>>> Phone: (613) 565-5056 (ext 14)
>>>> Fax: (613) 565-0925
>>>> ----------------------------------------------------------------
>>>
>>>
> gvSIG development Team
> www.gvsig.gva.es
>
--
----------------------------------------------------------------
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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