[Geoserver-devel] Pull request adding support for time relative expressions in WMS-T

GeoServer GeoServer Developer
1

Hi,
I would like to bring people attention to this pull request:
https://github.com/geoserver/geoserver/pull/823

It adds support for time relative expressions in this form:

  • private final static String CONTINUOUS_RELATIVE_PERIOD_H = “BACK2H/PRESENT”;
  • private final static String CONTINUOUS_RELATIVE_PERIOD_D = “BACK10D/PRESENT”;
  • private final static String CONTINUOUS_RELATIVE_PERIOD_W = “BACK400W/PRESENT”;

Any feedback we might have on the syntax or implementation?

Cheers
Andrea

···

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Ing. Andrea Aime

@geowolf
Technical Lead

GeoSolutions S.A.S.
Via Poggio alle Viti 1187
55054 Massarosa (LU)
Italy
phone: +39 0584 962313
fax: +39 0584 1660272
mob: +39 339 8844549

http://www.geo-solutions.it
http://twitter.com/geosolutions_it

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The information in this message and/or attachments, is intended solely for the attention and use of the named addressee(s) and may be confidential or proprietary in nature or covered by the provisions of privacy act (Legislative Decree June, 30 2003, no.196 - Italy’s New Data Protection Code).Any use not in accord with its purpose, any disclosure, reproduction, copying, distribution, or either dissemination, either whole or partial, is strictly forbidden except previous formal approval of the named addressee(s). If you are not the intended recipient, please contact immediately the sender by telephone, fax or e-mail and delete the information in this message that has been received in error. The sender does not give any warranty or accept liability as the content, accuracy or completeness of sent messages and accepts no responsibility for changes made after they were sent or for other risks which arise as a result of e-mail transmission, viruses, etc.

2

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)

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”;

···

On Tue, Dec 2, 2014 at 1:27 AM, Andrea Aime <andrea.aime@anonymised.com> wrote:

Hi,
I would like to bring people attention to this pull request:
https://github.com/geoserver/geoserver/pull/823

It adds support for time relative expressions in this form:

  • private final static String CONTINUOUS_RELATIVE_PERIOD_H = “BACK2H/PRESENT”;
  • private final static String CONTINUOUS_RELATIVE_PERIOD_D = “BACK10D/PRESENT”;
  • private final static String CONTINUOUS_RELATIVE_PERIOD_W = “BACK400W/PRESENT”;

Any feedback we might have on the syntax or implementation?

Cheers
Andrea

–

==

GeoServer Professional Services from the experts! Visit
http://goo.gl/NWWaa2 for more information.

==

Ing. Andrea Aime

@geowolf
Technical Lead

GeoSolutions S.A.S.
Via Poggio alle Viti 1187
55054 Massarosa (LU)
Italy
phone: +39 0584 962313
fax: +39 0584 1660272
mob: +39 339 8844549

http://www.geo-solutions.it
http://twitter.com/geosolutions_it

AVVERTENZE AI SENSI DEL D.Lgs. 196/2003

Le informazioni contenute in questo messaggio di posta elettronica e/o nel/i file/s allegato/i sono da considerarsi strettamente riservate. Il loro utilizzo è consentito esclusivamente al destinatario del messaggio, per le finalità indicate nel messaggio stesso. Qualora riceviate questo messaggio senza esserne il destinatario, Vi preghiamo cortesemente di darcene notizia via e-mail e di procedere alla distruzione del messaggio stesso, cancellandolo dal Vostro sistema. Conservare il messaggio stesso, divulgarlo anche in parte, distribuirlo ad altri soggetti, copiarlo, od utilizzarlo per finalità diverse, costituisce comportamento contrario ai principi dettati dal D.Lgs. 196/2003.

The information in this message and/or attachments, is intended solely for the attention and use of the named addressee(s) and may be confidential or proprietary in nature or covered by the provisions of privacy act (Legislative Decree June, 30 2003, no.196 - Italy’s New Data Protection Code).Any use not in accord with its purpose, any disclosure, reproduction, copying, distribution, or either dissemination, either whole or partial, is strictly forbidden except previous formal approval of the named addressee(s). If you are not the intended recipient, please contact immediately the sender by telephone, fax or e-mail and delete the information in this message that has been received in error. The sender does not give any warranty or accept liability as the content, accuracy or completeness of sent messages and accepts no responsibility for changes made after they were sent or for other risks which arise as a result of e-mail transmission, viruses, etc.

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Jody Garnett

3

On Wed, Dec 3, 2014 at 8:43 AM, Jody Garnett <jody.garnett@anonymised.com> 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

--

GeoServer Professional Services from the experts! Visit
http://goo.gl/NWWaa2 for more information.

Please, notice that GeoSolutions will be closed for seasonal holidays
from December the 24th to January the 6th

Ing. Andrea Aime
@geowolf
Technical Lead

GeoSolutions S.A.S.
Via Poggio alle Viti 1187
55054 Massarosa (LU)
Italy
phone: +39 0584 962313
fax: +39 0584 1660272
mob: +39 339 8844549

http://www.geo-solutions.it
http://twitter.com/geosolutions_it

*AVVERTENZE AI SENSI DEL D.Lgs. 196/2003*

Le informazioni contenute in questo messaggio di posta elettronica e/o
nel/i file/s allegato/i sono da considerarsi strettamente riservate. Il
loro utilizzo è consentito esclusivamente al destinatario del messaggio,
per le finalità indicate nel messaggio stesso. Qualora riceviate questo
messaggio senza esserne il destinatario, Vi preghiamo cortesemente di
darcene notizia via e-mail e di procedere alla distruzione del messaggio
stesso, cancellandolo dal Vostro sistema. Conservare il messaggio stesso,
divulgarlo anche in parte, distribuirlo ad altri soggetti, copiarlo, od
utilizzarlo per finalità diverse, costituisce comportamento contrario ai
principi dettati dal D.Lgs. 196/2003.

The information in this message and/or attachments, is intended solely for
the attention and use of the named addressee(s) and may be confidential or
proprietary in nature or covered by the provisions of privacy act
(Legislative Decree June, 30 2003, no.196 - Italy's New Data Protection
Code).Any use not in accord with its purpose, any disclosure, reproduction,
copying, distribution, or either dissemination, either whole or partial, is
strictly forbidden except previous formal approval of the named
addressee(s). If you are not the intended recipient, please contact
immediately the sender by telephone, fax or e-mail and delete the
information in this message that has been received in error. The sender
does not give any warranty or accept liability as the content, accuracy or
completeness of sent messages and accepts no responsibility for changes
made after they were sent or for other risks which arise as a result of
e-mail transmission, viruses, etc.

-------------------------------------------------------

4

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

···

On Wed, Dec 3, 2014 at 12:12 AM, Andrea Aime <andrea.aime@anonymised.com> wrote:

Jody Garnett

On Wed, Dec 3, 2014 at 8:43 AM, Jody Garnett <jody.garnett@anonymised.com> 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

–

==

GeoServer Professional Services from the experts! Visit
http://goo.gl/NWWaa2 for more information.

Please, notice that GeoSolutions will be closed for seasonal holidays
from December the 24th to January the 6th

==

Ing. Andrea Aime

@geowolf
Technical Lead

GeoSolutions S.A.S.
Via Poggio alle Viti 1187
55054 Massarosa (LU)
Italy
phone: +39 0584 962313
fax: +39 0584 1660272
mob: +39 339 8844549

http://www.geo-solutions.it
http://twitter.com/geosolutions_it

AVVERTENZE AI SENSI DEL D.Lgs. 196/2003

Le informazioni contenute in questo messaggio di posta elettronica e/o nel/i file/s allegato/i sono da considerarsi strettamente riservate. Il loro utilizzo è consentito esclusivamente al destinatario del messaggio, per le finalità indicate nel messaggio stesso. Qualora riceviate questo messaggio senza esserne il destinatario, Vi preghiamo cortesemente di darcene notizia via e-mail e di procedere alla distruzione del messaggio stesso, cancellandolo dal Vostro sistema. Conservare il messaggio stesso, divulgarlo anche in parte, distribuirlo ad altri soggetti, copiarlo, od utilizzarlo per finalità diverse, costituisce comportamento contrario ai principi dettati dal D.Lgs. 196/2003.

The information in this message and/or attachments, is intended solely for the attention and use of the named addressee(s) and may be confidential or proprietary in nature or covered by the provisions of privacy act (Legislative Decree June, 30 2003, no.196 - Italy’s New Data Protection Code).Any use not in accord with its purpose, any disclosure, reproduction, copying, distribution, or either dissemination, either whole or partial, is strictly forbidden except previous formal approval of the named addressee(s). If you are not the intended recipient, please contact immediately the sender by telephone, fax or e-mail and delete the information in this message that has been received in error. The sender does not give any warranty or accept liability as the content, accuracy or completeness of sent messages and accepts no responsibility for changes made after they were sent or for other risks which arise as a result of e-mail transmission, viruses, etc.