[Geoserver-devel] Discussion/vote for GSIP-173, GetLegendGraphic JSON output format

GeoServer GeoServer Developer
1

Hi all,
here is a new GSIP to discuss/vote:

https://github.com/geoserver/geoserver/wiki/GSIP-173

This is a revival of the old GSIP-81 (which was abandoned and never reached mergeable state).
The content has been simplified and updated to use the current version of GeoServer.

Feedback welcomed!

Cheers
Andrea

···

== GeoServer Professional Services from the experts! Visit http://goo.gl/it488V for more information. == Ing. Andrea Aime @geowolf Technical Lead GeoSolutions S.A.S. Via di Montramito 3/A 55054 Massarosa (LU) phone: +39 0584 962313 fax: +39 0584 1660272 mob: +39 339 8844549 http://www.geo-solutions.it http://twitter.com/geosolutions_it ------------------------------------------------------- Con riferimento alla normativa sul trattamento dei dati personali (Reg. UE 2016/679 - Regolamento generale sulla protezione dei dati “GDPR”), si precisa che ogni circostanza inerente alla presente email (il suo contenuto, gli eventuali allegati, etc.) è un dato la cui conoscenza è riservata al/i solo/i destinatario/i indicati dallo scrivente. Se il messaggio Le è giunto per errore, è tenuta/o a cancellarlo, ogni altra operazione è illecita. Le sarei comunque grato se potesse darmene notizia. This email is intended only for the person or entity to which it is addressed and may contain information that is privileged, confidential or otherwise protected from disclosure. We remind that - as provided by European Regulation 2016/679 “GDPR” - copying, dissemination or use of this e-mail or the information herein by anyone other than the intended recipient is prohibited. If you have received this email by mistake, please notify us immediately by telephone or e-mail.

2

+0

···

Regards,
Simone Giannecchini

GeoServer Professional Services from the experts!
Visit http://goo.gl/it488V for more information.

Ing. Simone Giannecchini
@simogeo
Founder/Director

GeoSolutions S.A.S.
Via di Montramito 3/A
55054 Massarosa (LU)
Italy
phone: +39 0584 962313
fax: +39 0584 1660272
mob: +39 333 8128928

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http://twitter.com/geosolutions_it

Con riferimento alla normativa sul trattamento dei dati personali (Reg. UE 2016/679 - Regolamento generale sulla protezione dei dati “GDPR”), si precisa che ogni circostanza inerente alla presente email (il suo contenuto, gli eventuali allegati, etc.) è un dato la cui conoscenza è riservata al/i solo/i destinatario/i indicati dallo scrivente. Se il messaggio Le è giunto per errore, è tenuta/o a cancellarlo, ogni altra operazione è illecita. Le sarei comunque grato se potesse darmene notizia.

This email is intended only for the person or entity to which it is addressed and may contain information that is privileged, confidential or otherwise protected from disclosure. We remind that - as provided by European Regulation 2016/679 “GDPR” - copying, dissemination or use of this e-mail or the information herein by anyone other than the intended recipient is prohibited. If you have received this email by mistake, please notify us immediately by telephone or e-mail.

3

+1

···

==

GeoServer Professional Services from the experts! Visit http://goo.gl/it488V for more information.

Ing. Alessio Fabiani

@alfa7691
Founder/Technical Lead

GeoSolutions S.A.S.
Via di Montramito 3/A - 55054 Massarosa (LU) - Italy
phone: +39 0584 962313
fax: +39 0584 1660272
mob: +39 331 6233686

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

Con riferimento alla normativa sul trattamento dei dati personali (Reg. UE 2016/679 - Regolamento generale sulla protezione dei dati “GDPR”), si precisa che ogni circostanza inerente alla presente email (il suo contenuto, gli eventuali allegati, etc.) è un dato la cui conoscenza è riservata al/i solo/i destinatario/i indicati dallo scrivente. Se il messaggio Le è giunto per errore, è tenuta/o a cancellarlo, ogni altra operazione è illecita. Le sarei comunque grato se potesse darmene notizia.

This email is intended only for the person or entity to which it is addressed and may contain information that is privileged, confidential or otherwise protected from disclosure. We remind that - as provided by European Regulation 2016/679 “GDPR” - copying, dissemination or use of this e-mail or the information herein by anyone other than the intended recipient is prohibited. If you have received this email by mistake, please notify us immediately by telephone or e-mail.

4

+1

Ian

On Mon, 3 Dec 2018, 10:41 Andrea Aime <andrea.aime@anonymised.com wrote:

Hi all,
here is a new GSIP to discuss/vote:

https://github.com/geoserver/geoserver/wiki/GSIP-173

This is a revival of the old GSIP-81 (which was abandoned and never reached mergeable state).
The content has been simplified and updated to use the current version of GeoServer.

Feedback welcomed!

Cheers
Andrea

== GeoServer Professional Services from the experts! Visit http://goo.gl/it488V for more information. == Ing. Andrea Aime @geowolf Technical Lead GeoSolutions S.A.S. Via di Montramito 3/A 55054 Massarosa (LU) phone: +39 0584 962313 fax: +39 0584 1660272 mob: +39 339 8844549 http://www.geo-solutions.it http://twitter.com/geosolutions_it ------------------------------------------------------- Con riferimento alla normativa sul trattamento dei dati personali (Reg. UE 2016/679 - Regolamento generale sulla protezione dei dati “GDPR”), si precisa che ogni circostanza inerente alla presente email (il suo contenuto, gli eventuali allegati, etc.) è un dato la cui conoscenza è riservata al/i solo/i destinatario/i indicati dallo scrivente. Se il messaggio Le è giunto per errore, è tenuta/o a cancellarlo, ogni altra operazione è illecita. Le sarei comunque grato se potesse darmene notizia. This email is intended only for the person or entity to which it is addressed and may contain information that is privileged, confidential or otherwise protected from disclosure. We remind that - as provided by European Regulation 2016/679 “GDPR” - copying, dissemination or use of this e-mail or the information herein by anyone other than the intended recipient is prohibited. If you have received this email by mistake, please notify us immediately by telephone or e-mail.

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5

Looks like we should just make a JSON representation of SLD and call if a day :slight_smile:

+1

Thinking through the CQL, …

The CQL requiring square brackets is strictly to avoid overlap with string literal.

One thing I do not see for CQL is a fallback value?

It may be useful in cases where the polygon fill for example is a CQL expression since a legend does not have as sample feature to work from, would allow a client without the ability to parse CQL to display display something.

Alternatively it may be smart to list colours to display (for example representing a recode or interpolate function?)

···

–
Jody Garnett

6

Looks like we should just make a JSON representation of SLD and call if a day :slight_smile:

That would be a GetStyles call not a GetLegendGraphic one though :wink:

+1

Thanks, added

Thinking through the CQL, …

The CQL requiring square brackets is strictly to avoid overlap with string literal.

Yes

One thing I do not see for CQL is a fallback value?

It may be useful in cases where the polygon fill for example is a CQL expression since a legend does not have as sample feature to work from, would allow a client without the ability to parse CQL to display display something.

There is no such a thing as a fallback in the normal GetLegendGraphic either, when GeoServer generates it, it just builds a fake
feature with default values for each type from DataUtilities, and pray that it does not blow up. Often it does, other times the result does not make sense.
The client can setup defaults of their own if they want, but the “smart” and honest thing IMHO is admitting that you don’t know what the
color or stroke width will be, and eventually give the user a way to see the law governing it (e.g., by showing the CQL in a popup).

Alternatively it may be smart to list colours to display (for example representing a recode or interpolate function?)

A client can be setup for minimum parsing of CQL, even just regex based, to extract that information, but if you cannot correlate
that with a quantity, the colors that you are going to list are meaningless.
Best to have a readable title in that case, and if the user really wants to know, they can look at the CQL attached to that rule.

Cheers
Andrea

···

GeoServer Professional Services from the experts! Visit http://goo.gl/it488V for more information. == Ing. Andrea Aime @geowolf Technical Lead GeoSolutions S.A.S. Via di Montramito 3/A 55054 Massarosa (LU) phone: +39 0584 962313 fax: +39 0584 1660272 mob: +39 339 8844549 http://www.geo-solutions.it http://twitter.com/geosolutions_it ------------------------------------------------------- Con riferimento alla normativa sul trattamento dei dati personali (Reg. UE 2016/679 - Regolamento generale sulla protezione dei dati “GDPR”), si precisa che ogni circostanza inerente alla presente email (il suo contenuto, gli eventuali allegati, etc.) è un dato la cui conoscenza è riservata al/i solo/i destinatario/i indicati dallo scrivente. Se il messaggio Le è giunto per errore, è tenuta/o a cancellarlo, ogni altra operazione è illecita. Le sarei comunque grato se potesse darmene notizia. This email is intended only for the person or entity to which it is addressed and may contain information that is privileged, confidential or otherwise protected from disclosure. We remind that - as provided by European Regulation 2016/679 “GDPR” - copying, dissemination or use of this e-mail or the information herein by anyone other than the intended recipient is prohibited. If you have received this email by mistake, please notify us immediately by telephone or e-mail.