[Mapserver-users] time support

Tue Dec 16 17:30:29 PST 2003

Hi,

Thanks for the info.  We are looking forward to this functionality.

As for my specific problem, here's a use case.

Data: point data, with

X  | Y | temperature | date
---------------------------------
-75|45 |25           |25-Aug-2003
---------------------------------
.....

We have, on a daily basis, 160 years worth or records.

Scenario:

Show me the temperature on the day I was born through OGC:WMS.

So, we would make a GetMap request, with a filter for time, to show *only*
the data point for the given day, as per the attribute table.

..Tom

> -----Original Message-----
> From: Steve Lime [mailto:steve.lime at dnr.state.mn.us] 
> Sent: Tuesday, December 16, 2003 4:29 PM
> To: Tom.Kralidis at ec.gc.ca; mapserver-users at lists.gis.umn.edu
> Subject: Re: [Mapserver-users] time support
> 
> 
> Hi Tom: I'm not aware of, but perhaps Daniel is, any plans for direct
> temporal support with WMS. There are however some peripheral 
> activities
> that may be of interest.
> 
> 1) The UMN (w/Frank) are working to develop OGR drivers for
> OPeNDAP/DODS servers. A GDAL driver has already been written 
> by the DODS
> folks and integration tests with MapServer should be forthcoming.
> Because of the nature of the datasets distributed using these types of
> services the time element will become more important. I'm not 
> sure what
> that means but we'll have a better idea in the near future.
> 
> 2) As part of WCS support I'm adding the notion of a temporal index to
> MapServer. The idea being that you would use a tabular index (an xbase
> file) to organize data within a single layer temporally and then would
> specify which slice to use using some sort of a temporal id. That way
> you could serve 100's of images for a common geographic area using a
> single layer definition. There may well be benefits for vector data as
> well.
> 
> 1) and 2) are in the works and should be completed this spring. There
> may certainly be other workarounds but we'd need more 
> information about
> the problem you're trying to solve.
> 
> Steve
> 
> Stephen Lime
> Data & Applications Manager
> 
> Minnesota DNR
> 500 Lafayette Road
> St. Paul, MN 55155
> 651-297-2937
> 
> >>> "Kralidis,Tom [Burlington]" <Tom.Kralidis at ec.gc.ca> 12/16/2003
> 11:41:26 AM >>>
> 
> Hi,
> 
> We have an activity which requires interfacing with a WMS supporting
> the
> TIME construct, as per ISO8601, for OGC:WMS communication with
> point-based
> temporal observation data.
> 
> Does MapServer support this in its WMS face?  If no, are there any
> plans to
> do so, and ETA?  Are there any workaround / interim solutions to do
> this?
> 
> Basically looking for a state of affairs w.r.t. this issue.
> 
> Thanks
> 
> ..Tom
> =========================
> Tom Kralidis
> Systems Scientist
> Environment Canada
> Tel: +01-905-336-4409
> http://www.ec.gc.ca/cise/ 
> ========================= 
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