Sounds like the correct approach.
Best regards,
Bart
Yewondwossen Assefa wrote:
Hi There,
We could add a support by supporting "wms_timeitem_min" and
"wms_timeitem_max" (mutually exclusive with wms_timeitem) and doing
the following for different time values passed in the wms TIME
parameter :
- single time for example: ...&TIME=2004-10-12&... would give
(`[time_field_min]` <= `2004-10-12`) and `[time_field_max]` >=
`2004-10-12`)
- multiple values (2004-10-12, 2004-10-13) would give
((`[time_field_min]` <= `2004-10-12` and `[time_field_max]` >=
`2004-10-12`) OR (`[time_field_min]` <= `2004-10-13`) and
`[time_field_max]` >= `2004-10-13`))
- single range : 2004-10-12/2004-10-13 transforms to
((`[time_field_min]` <= `2004-10-12`) AND (`[time_field_max]` >=
`2004-10-13`))
- multiple ranges (2004-10-12/2004-10-13, 2004-10-15/2004-10-16)
transform to ((`[time_field_min]` <= `2004-10-12`) AND
(`[time_field_max]` >= `2004-10-13`)) OR ((`[time_field_min]` <=
`2004-10-15`) AND (`[time_field_max]` >= `2004-10-16`))
Is this acceptable ? Do you see other ways ? I have added a bug
related to this http://mapserver.gis.umn.edu/bugs/show_bug.cgi?id=1849
Later,
Eijnden, Bart van den (AGI) wrote:
Hi Assefa,
so e.g. you would have (DD-MM-YYYY):
ROAD_SEGMENT_ID MIN_DATE MAX_DATE
1 01-01-2006 01-04-2006
2 01-03-2006 01-06-2006
etc.
So these represent validity, the road segment is valid/existant
between MIN_DATE and MAX_DATE.
So if I want a map with the situation of 01-05-2006, 1 would not be
on it, but 2 would be.
If I would want a map with the situation of 15-03-2006 until
15-04-2006, both would be on it.
Does this make sense?
Best regards,
Bart
-----Oorspronkelijk bericht-----
Van: UMN MapServer Users List
[mailto:[EMAIL PROTECTED] Yewondwossen Assefa
Verzonden: donderdag 27 juli 2006 3:35
Aan: [email protected]
Onderwerp: Re: [UMN_MAPSERVER-USERS] WMS time question
Bart,
Bart van den Eijnden (OSGIS) wrote:
Hi list,
looking through the Mapserver WMS time HOWTO I wondered one thing,
it is
only possible to have 1 timeitem, a DB column which contains the
date/time. Ofcourse this is pretty okay for satellite images (in a
tileindex) which are taken every X days/months.
But what happens to road network segments (geometries in Oracle Spatial
for instance) which have a minimum date and a maximum date? So you
need to
specify 2 timeitems (one min and one max) for that. Was this use
case just
not implemented?
What would the min/max date represent : the valid time extents or
simply 2 time fields on which we can do a query ?
The wms request allows to send a time value that is then compared to
the value inside the timeitem. Would you expect to be able to compare
the time request between the 2 timeitmes defined ?
Best regards,
Bart
--
Bart van den Eijnden
OSGIS, Open Source GIS
http://www.osgis.nl
