Hi,
After second reading I support Jody and the ecql syntax.
Andrea wrote:
“P standard for period, so that would not work. I guess it may may sense to use R (relative?), and get something
like R-2H/PRESENT. ”
Why would P not work because “period” and “duration” seem to be synonyms as they are used in Time/Time, Duration/Time, and Time/Duration syntax in http://docs.geoserver.org/latest/en/user/filter/ecql_reference.html#ecql-period ?
-Jukka-
···
Lähettäjä: Jody Garnett [mailto:jody.garnett@…403…]
Lähetetty: 3. joulukuuta 2014 10:17
Vastaanottaja: Andrea Aime
Kopio: Geoserver-devel
Aihe: Re: [Geoserver-devel] Pull request adding support for time relative expressions in WMS-T
That is cool, those ideas were only for another point of reference.
If we do not match ECQL exactly then it is probably not worth it. Could we skip the “prefix” and just use:
private final static String CONTINUOUS_RELATIVE_PERIOD_H = “2H/PRESENT”;
private final static String CONTINUOUS_RELATIVE_PERIOD_D = “10D/PRESENT”;
I guess I do not understand what “BACK” is needed for? I liked the ECQL technique of using “DURATION/TIME” or “TIME/DURATION”.
“BACK2H/PRESENT” is a belt and suspenders, I already know you are going to go back since the duration is before the time. It is not like you are going to say “FORWARD2H/PRESENT” (instead you would say “PRESENT/2H”).
Cheers,
Jody
Jody Garnett
On Wed, Dec 3, 2014 at 12:12 AM, Andrea Aime <andrea.aime@…1268…> wrote:
On Wed, Dec 3, 2014 at 8:43 AM, Jody Garnett <jody.garnett@…403…> wrote:
So this is for WMS-T … as in WMS Temporal.
The syntax is clear.
Here are two ideas for quick consideration:
CQL Time Duration
WFS 2.0 has temporal functions which we have dragged into CQL, any advantage to being consistent with the syntax here: http://docs.geoserver.org/latest/en/user/filter/ecql_reference.html#ecql-period
In particular the representation of time period seems nice and terse:
private final static String CONTINUOUS_RELATIVE_PERIOD_H = “P2H/PRESENT”;
private final static String CONTINUOUS_RELATIVE_PERIOD_D = “P10D/PRESENT”;
(There was no duration specified in weeks, I also did not see a representation for PRESENT, NOW … or FIRST or LATEST)
P standard for period, so that would not work. I guess it may may sense to use R (relative?), and get something
like R-2H/PRESENT.
WFS 2.0 FeatureId madness
This is probably a terrible idea, but you may wish to steal language such as FIRST and LATEST above.
The second thing WFS 2.0 has going on is the ability to query FeatureId based on previous, first or by date (see http://docs.geotools.org/latest/userguide/library/opengis/filter.html#identifer).
Any advantage to stealing the language of FIRST, PREVIOUS, etc…?
private final static String CONTINUOUS_RELATIVE_PERIOD_Y = “FIRST/P1Y”;
Hmm… I would not go there, WMS-T often works on a moving window, so FIRST and LATEST change daily or more often,
you never know what they mean.
Cheers
Andrea
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My mission was to stick more ideas in front of you and encourage consistency if possible.