Hi,
I suppose that Kosmo is using some sort of disk cache while OpenJUMP keeps
everything in memory. Going to 64-bit Java was a huge improvement for OJ but
still it is memory bound.
Does Roberto need to handle all the 1.5 million features at a time? Often it is
enough that all the features are available when you zoom in enough. If that
happens to be the case he can just set the max features for that layer to,
let’s say 10000. In OpenJUMP layers which are added with that route from
PostGIS are dynamic. It means that when user pans or zooms a new query with new
bounding box and LIMIT=10000 is fired. It means that it is both fast and
memory friendly. It also means that in country wide view the map may look
empty.
Run datastore query has similar option. Zoom to your area of interest, write
your query like
SELECT * FROM my_huge_layer;
Now press the View button. It will add text ${view:0} to the query and it means
that only features within the view will be fetched. This layer will be
non-dynamic but user can use mouse right click on top of the layer name, select
Database-Refresh Layer and a new query with the current BBOX will me made.
It is also possible to prevent the heavy country wide requests through the
layer “Style – Scale - Only show layer when scale is between”.
If Roberto must do something for all the 1.5 million features he may still be
able to do that in batches. Run datastore queries as
SELECT * FROM my_huge_layer limit 100000;
SELECT * FROM my_huge_layer limit 100000 offset 100000;
SELECT * FROM my_huge_layer limit 100000 offset 200000;
…
-Jukka Rahkonen-
Stefan Steiniger wrote:
So, it appears that Roberto is loading the features (1.5 million) from postgis,
and gets an out of memory (he is working on Ubuntu with 8gb). Supposedly it
works with Kosmo. Not sure what one can do here? Anyone an idea?
Stefan
El 29-09-2016, a las 07:49, Roberto Carlos Albani Meolans
<robertoalb...@hotmail.com<mailto:robertoalb...@hotmail.com>> escribió:
Gracias por tu ayuda.
Tengo 8g de ram
Estoy trabajando con base de datos postgis y trato de leer desde ahi.
se entiende??
Gracias
[Lähettäjä poisti kuvan.] Roberto Carlos Albani Meolans
________________________________
De:
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<jump-pilot-devel-requ...@lists.sourceforge.net<mailto:jump-pilot-devel-requ...@lists.sourceforge.net>>
Enviado: jueves, 29 de septiembre de 2016 01:00 a.m.
Para:
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Asunto: Jump-pilot-devel Digest, Vol 123, Issue 41
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2. Re: Add SRID and units to Task
(manf...@egger-gis.at<mailto:manf...@egger-gis.at>)
----------------------------------------------------------------------
Message: 1
Date: 28 Sep 2016 21:56:26 -0300
From: "stefan steiniger" <sst...@geo.uzh.ch<mailto:sst...@geo.uzh.ch>>
Subject: Re: [JPP-Devel] Jump-pilot-devel Digest, Vol 123, Issue 39
To: "OpenJump develop and use"
<jump-pilot-devel@lists.sourceforge.net<mailto:jump-pilot-devel@lists.sourceforge.net>>
Message-ID:
<fdda8b87-16cb-4ede-b2eb-400600ad5...@geo.uzh.ch<mailto:fdda8b87-16cb-4ede-b2eb-400600ad5...@geo.uzh.ch>>
Content-Type: text/plain; charset=windows-1252
Hola Roberto,
buena saber. Entonces tu cambiaste el archivo oj_linux.sh y reiniciaste
OpenJUMP? (si me quieres mandar el archivo directo, pero bien hasta domingo
estar? de viaje). Cuando ram tiene tu PC?
Pero no tengo claro porque eso funciona con Kosmo pero no funciona con
OpenJUMP. Excepto Kosmo no esta leyendo el archivo completo - o viene de una
base de datos Postgis?
slds,
stefan
Si no resulta, QGIS es tal vez la mejor alternativa - tambi?n con respeto a las
funciones de cartograf?a y funciones de procesamiento (hay muchos ?plugins?).
On Sep 28, 2016, at 8:31, Roberto Carlos Albani Meolans
<robertoalb...@hotmail.com<mailto:robertoalb...@hotmail.com>> wrote:
> Hola, y muchas gracias por su atencion.
> El problema de memoria sigue.
> Estamos trabajando en un sistema de catastro (Santa Fe, Argentina), donde se
> utiliza genamap como gis y queremos cambiar a so libre, y nos gusto mucho
> OpenJump.
> Hemos probado con Kosmo y este problema de memoria no lo tiene, levanta el
> 1.500.000 registro de parcela y no tiene problema de memoria. Pero la
> decicion de un gis es OpenJump.
>
> La Pc es ubuntu 12.04 a 32 bit.
>
> Gracias, nuevamente
> Roberto Carlos Albani Meolans
>
>
>
> De:
> jump-pilot-devel-requ...@lists.sourceforge.net<mailto:jump-pilot-devel-requ...@lists.sourceforge.net>
>
> <jump-pilot-devel-requ...@lists.sourceforge.net<mailto:jump-pilot-devel-requ...@lists.sourceforge.net>>
> Enviado: martes, 27 de septiembre de 2016 07:37 p.m.
> Para:
> jump-pilot-devel@lists.sourceforge.net<mailto:jump-pilot-devel@lists.sourceforge.net>
> Asunto: Jump-pilot-devel Digest, Vol 123, Issue 39
>
> Send Jump-pilot-devel mailing list submissions to
>
> jump-pilot-devel@lists.sourceforge.net<mailto:jump-pilot-devel@lists.sourceforge.net>
>
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> than "Re: Contents of Jump-pilot-devel digest..."
>
>
> Today's Topics:
>
> 1. memoria (Roberto Carlos Albani Meolans)
> 2. Re: memoria (edgar.sol...@web.de<mailto:edgar.sol...@web.de>)
> 3. Re: memoria (stefan steiniger)
> 4. Re: memoria (edgar.sol...@web.de<mailto:edgar.sol...@web.de>)
> 5. SVN: [5032]
> core/trunk/src/com/vividsolutions/jump/datastore/postgis/
> PostgisValueConverterFactory.java
>
> (jump-pilot-...@lists.sourceforge.net<mailto:jump-pilot-...@lists.sourceforge.net>)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 26 Sep 2016 13:52:38 +0000
> From: Roberto Carlos Albani Meolans
> <robertoalb...@hotmail.com<mailto:robertoalb...@hotmail.com>>
> Subject: [JPP-Devel] memoria
> To:
> "jump-pilot-devel-requ...@lists.sourceforge.net<mailto:jump-pilot-devel-requ...@lists.sourceforge.net>"
>
> <jump-pilot-devel-requ...@lists.sourceforge.net<mailto:jump-pilot-devel-requ...@lists.sourceforge.net>>,
>
> "jump-pilot-devel@lists.sourceforge.net<mailto:jump-pilot-devel@lists.sourceforge.net>"
>
> <jump-pilot-devel@lists.sourceforge.net<mailto:jump-pilot-devel@lists.sourceforge.net>>
> Message-ID:
>
> <by2pr17mb04567c83f7e7d6041d7fe53ab5...@by2pr17mb0456.namprd17.prod.outlook.com<mailto:by2pr17mb04567c83f7e7d6041d7fe53ab5...@by2pr17mb0456.namprd17.prod.outlook.com>>
>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hola, estoy trabajando con openJump y cuando quiero cargar 1.500.000 registro
> de parcelas tengo problemas de memoria.
>
>
> Exception in thread "AWT-EventQueue-0" Exception in thread "TimerQueue"
> java.lang.OutOfMemoryError: GC overhead limit exceeded
> Exception: java.lang.OutOfMemoryError thrown from the
> UncaughtExceptionHandler in thread "TimerQueue"
>
> at sun.java2d.SunGraphics2D.clone(SunGraphics2D.java:274)
> at sun.java2d.SunGraphics2D.create(SunGraphics2D.java:308)
> at java.awt.Graphics.create(Graphics.java:164)
> at javax.swing.JComponent.paintChildren(JComponent.java:870)
> at javax.swing.JSplitPane.paintChildren(JSplitPane.java:1047)
> at javax.swing.JComponent.paint(JComponent.java:1064)
> at javax.swing.JComponent.paintChildren(JComponent.java:888)
> at javax.swing.JComponent.paint(JComponent.java:1064)
> Exception in thread "AWT-XAWT" Exception in thread "AWT-EventQueue-0"
> java.lang.OutOfMemoryError: GC overhead limit exceeded
> java.lang.OutOfMemoryError: GC overhead limit exceeded
> [INFO] 10:50:02.296 Warning: GC overhead limit exceede
>
>
> que puedo hace??
> Gracias
>
>
>
> [http://graphics.hotmail.com/emsmilep.gif] Roberto Carlos Albani Meolans
> -------------- next part --------------
> An HTML attachment was scrubbed...
>
> ------------------------------
>
> Message: 2
> Date: Mon, 26 Sep 2016 15:58:08 +0200
> From: edgar.sol...@web.de<mailto:edgar.sol...@web.de>
> Subject: Re: [JPP-Devel] memoria
> To: OpenJump develop and use
> <jump-pilot-devel@lists.sourceforge.net<mailto:jump-pilot-devel@lists.sourceforge.net>>
> Message-ID:
> <74277027-8de9-81c6-cc43-0f6f95d70...@web.de<mailto:74277027-8de9-81c6-cc43-0f6f95d70...@web.de>>
> Content-Type: text/plain; charset=windows-1252
>
> On 26.09.2016 15:52, Roberto Carlos Albani Meolans wrote:
> > Hola, estoy trabajando con openJump y cuando quiero cargar 1.500.000
> > registro de parcelas tengo problemas de memoria.
> >
> >
> > Exception in thread "AWT-EventQueue-0" Exception in thread "TimerQueue"
> > java.lang.OutOfMemoryError: GC overhead limit exceeded
> > Exception: java.lang.OutOfMemoryError thrown from the
> > UncaughtExceptionHandler in thread "TimerQueue"
> >
> > at sun.java2d.SunGraphics2D.clone(SunGraphics2D.java:274)
> > at sun.java2d.SunGraphics2D.create(SunGraphics2D.java:308)
> > at java.awt.Graphics.create(Graphics.java:164)
> > at javax.swing.JComponent.paintChildren(JComponent.java:870)
> > at javax.swing.JSplitPane.paintChildren(JSplitPane.java:1047)
> > at javax.swing.JComponent.paint(JComponent.java:1064)
> > at javax.swing.JComponent.paintChildren(JComponent.java:888)
> > at javax.swing.JComponent.paint(JComponent.java:1064)
> > Exception in thread "AWT-XAWT" Exception in thread "AWT-EventQueue-0"
> > java.lang.OutOfMemoryError: GC overhead limit exceeded
> > java.lang.OutOfMemoryError: GC overhead limit exceeded
> > [INFO] 10:50:02.296 Warning: GC overhead limit exceede
> >
> >
> > que puedo hace??
>
> hey Roberto, can you write in english by any chance? ..ede
>
>
>
> ------------------------------
>
> Message: 3
> Date: 26 Sep 2016 19:23:14 -0300
> From: "stefan steiniger" <sst...@geo.uzh.ch<mailto:sst...@geo.uzh.ch>>
> Subject: Re: [JPP-Devel] memoria
> To: "OpenJump develop and use"
>
> <jump-pilot-devel@lists.sourceforge.net<mailto:jump-pilot-devel@lists.sourceforge.net>>
> Message-ID:
> <3a310f2f-8727-481f-b453-aa63d7a94...@geo.uzh.ch<mailto:3a310f2f-8727-481f-b453-aa63d7a94...@geo.uzh.ch>>
> Content-Type: text/plain; charset=windows-1252
>
> Hola Roberto,
>
> se puede aumentar la memoria en oj_windows.bat o oj_linux.sh en la linea
> #JAVA_MAXMEM=?-Xmx1024M
> hay que borrar el # y en este caso la memoria usado seria 1024MG=1GB cuando
> abres OpenJUMP de nuevo.
>
> slds,
> Stefan
>
> @Edgar, hope its ok when I just respond - although its an english list ;)
>
> On Sep 26, 2016, at 10:58, edgar.sol...@web.de<mailto:edgar.sol...@web.de>
> wrote:
>
> > On 26.09.2016 15:52, Roberto Carlos Albani Meolans wrote:
> >> Hola, estoy trabajando con openJump y cuando quiero cargar 1.500.000
> >> registro de parcelas tengo problemas de memoria.
> >>
> >>
> >> Exception in thread "AWT-EventQueue-0" Exception in thread "TimerQueue"
> >> java.lang.OutOfMemoryError: GC overhead limit exceeded
> >> Exception: java.lang.OutOfMemoryError thrown from the
> >> UncaughtExceptionHandler in thread "TimerQueue"
> >>
> >> at sun.java2d.SunGraphics2D.clone(SunGraphics2D.java:274)
> >> at sun.java2d.SunGraphics2D.create(SunGraphics2D.java:308)
> >> at java.awt.Graphics.create(Graphics.java:164)
> >> at javax.swing.JComponent.paintChildren(JComponent.java:870)
> >> at javax.swing.JSplitPane.paintChildren(JSplitPane.java:1047)
> >> at javax.swing.JComponent.paint(JComponent.java:1064)
> >> at javax.swing.JComponent.paintChildren(JComponent.java:888)
> >> at javax.swing.JComponent.paint(JComponent.java:1064)
> >> Exception in thread "AWT-XAWT" Exception in thread "AWT-EventQueue-0"
> >> java.lang.OutOfMemoryError: GC overhead limit exceeded
> >> java.lang.OutOfMemoryError: GC overhead limit exceeded
> >> [INFO] 10:50:02.296 Warning: GC overhead limit exceede
> >>
> >>
> >> que puedo hace??
> >
> > hey Roberto, can you write in english by any chance? ..ede
> >
> > ------------------------------------------------------------------------------
> > _______________________________________________
> > Jump-pilot-devel mailing list
> > Jump-pilot-devel@lists.sourceforge.net<mailto:Jump-pilot-devel@lists.sourceforge.net>
> > https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel
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> messing with ...
>
>
>
>
>
>
> ------------------------------
>
> Message: 4
> Date: Tue, 27 Sep 2016 09:48:01 +0200
> From: edgar.sol...@web.de<mailto:edgar.sol...@web.de>
> Subject: Re: [JPP-Devel] memoria
> To:
> jump-pilot-devel@lists.sourceforge.net<mailto:jump-pilot-devel@lists.sourceforge.net>
> Message-ID:
> <fcd56a02-815a-91c9-8315-3eb75d16c...@web.de<mailto:fcd56a02-815a-91c9-8315-3eb75d16c...@web.de>>
> Content-Type: text/plain; charset=windows-1252
>
> Stefan,
>
> just didn't want to activate an online translator, in case he's english
> capable. afaics you suggest to manually adjust the maxmem setting. i would
> ask him for the OJ version used, as we have a routine that sets maxmem to 90%
> or so of the available memory since a while.
>
> also using more then 1GB requires a java 64bit runtime.. ede
>
> On 27.09.2016 00:23, stefan steiniger wrote:
> > Hola Roberto,
> >
> > se puede aumentar la memoria en oj_windows.bat o oj_linux.sh en la linea
> > #JAVA_MAXMEM=?-Xmx1024M
> > hay que borrar el # y en este caso la memoria usado seria 1024MG=1GB cuando
> > abres OpenJUMP de nuevo.
> >
> > slds,
> > Stefan
> >
> > @Edgar, hope its ok when I just respond - although its an english list ;)
> >
> > On Sep 26, 2016, at 10:58, edgar.sol...@web.de<mailto:edgar.sol...@web.de>
> > wrote:
> >
> >> On 26.09.2016 15:52, Roberto Carlos Albani Meolans wrote:
> >>> Hola, estoy trabajando con openJump y cuando quiero cargar 1.500.000
> >>> registro de parcelas tengo problemas de memoria.
> >>>
> >>>
> >>> Exception in thread "AWT-EventQueue-0" Exception in thread "TimerQueue"
> >>> java.lang.OutOfMemoryError: GC overhead limit exceeded
> >>> Exception: java.lang.OutOfMemoryError thrown from the
> >>> UncaughtExceptionHandler in thread "TimerQueue"
> >>>
> >>> at sun.java2d.SunGraphics2D.clone(SunGraphics2D.java:274)
> >>> at sun.java2d.SunGraphics2D.create(SunGraphics2D.java:308)
> >>> at java.awt.Graphics.create(Graphics.java:164)
> >>> at javax.swing.JComponent.paintChildren(JComponent.java:870)
> >>> at javax.swing.JSplitPane.paintChildren(JSplitPane.java:1047)
> >>> at javax.swing.JComponent.paint(JComponent.java:1064)
> >>> at javax.swing.JComponent.paintChildren(JComponent.java:888)
> >>> at javax.swing.JComponent.paint(JComponent.java:1064)
> >>> Exception in thread "AWT-XAWT" Exception in thread "AWT-EventQueue-0"
> >>> java.lang.OutOfMemoryError: GC overhead limit exceeded
> >>> java.lang.OutOfMemoryError: GC overhead limit exceeded
> >>> [INFO] 10:50:02.296 Warning: GC overhead limit exceede
> >>>
> >>>
> >>> que puedo hace??
> >>
> >> hey Roberto, can you write in english by any chance? ..ede
> >>
> >> ------------------------------------------------------------------------------
> >> _______________________________________________
> >> Jump-pilot-devel mailing list
> >> Jump-pilot-devel@lists.sourceforge.net<mailto:Jump-pilot-devel@lists.sourceforge.net>
> >> https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel
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>
> >
> >
> > ------------------------------------------------------------------------------
> > _______________________________________________
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> > Jump-pilot-devel@lists.sourceforge.net<mailto:Jump-pilot-devel@lists.sourceforge.net>
> > https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel
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> >
>
>
>
> ------------------------------
>
> Message: 5
> Date: Tue, 27 Sep 2016 22:37:06 +0000
> From:
> jump-pilot-...@lists.sourceforge.net<mailto:jump-pilot-...@lists.sourceforge.net>
> Subject: [JPP-Devel] SVN: [5032]
> core/trunk/src/com/vividsolutions/jump/datastore/postgis/
> PostgisValueConverterFactory.java
> To:
> jump-pilot-devel@lists.sourceforge.net<mailto:jump-pilot-devel@lists.sourceforge.net>
> Message-ID:
>
> <mailman.37875.1475015828.6153.jump-pilot-de...@lists.sourceforge.net<mailto:mailman.37875.1475015828.6153.jump-pilot-de...@lists.sourceforge.net>>
> Content-Type: text/plain; charset=UTF-8
>
> Revision: 5032
> http://sourceforge.net/p/jump-pilot/code/5032
> Author: michaudm
> Date: 2016-09-27 22:37:05 +0000 (Tue, 27 Sep 2016)
> Log Message:
> -----------
> Finally remove bytea->geometry mapping for postgis
>
> Modified Paths:
> --------------
>
> core/trunk/src/com/vividsolutions/jump/datastore/postgis/PostgisValueConverterFactory.java
>
> Modified:
> core/trunk/src/com/vividsolutions/jump/datastore/postgis/PostgisValueConverterFactory.java
> ===================================================================
> ---
> core/trunk/src/com/vividsolutions/jump/datastore/postgis/PostgisValueConverterFactory.java
> 2016-09-25 22:42:47 UTC (rev 5031)
> +++
> core/trunk/src/com/vividsolutions/jump/datastore/postgis/PostgisValueConverterFactory.java
> 2016-09-27 22:37:05 UTC (rev 5032)
> @@ -24,7 +24,8 @@
>
> // manages 2 cases: type retrieved from Database metadata (DataStore
> Panel)
> // and from direct Adhoc query (type of the column resultset).
> - if ("bytea".equalsIgnoreCase(dbTypeName) ||
> "geometry".equalsIgnoreCase(dbTypeName)) {
> + // Finally, converting bytea to geometry is a bad idea
> + if (/*"bytea".equalsIgnoreCase(dbTypeName) ||*/
> "geometry".equalsIgnoreCase(dbTypeName)) {
> return WKB_GEOMETRY_MAPPER;
> }
>
>
>
>
>
> ------------------------------
>
> ------------------------------------------------------------------------------
>
>
> ------------------------------
>
> _______________________________________________
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>
>
> End of Jump-pilot-devel Digest, Vol 123, Issue 39
> *************************************************
>
> ------------------------------------------------------------------------------
> _______________________________________________
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------------------------------
Message: 2
Date: Thu, 29 Sep 2016 00:00:08 -0400 (EDT)
From: "manf...@egger-gis.at<mailto:manf...@egger-gis.at>"
<manf...@egger-gis.at<mailto:manf...@egger-gis.at>>
Subject: Re: [JPP-Devel] Add SRID and units to Task
To: "OpenJump develop and use"
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Good morning!
I published a first version of my tool including registered EPSG-Codes in
geotools 2.6.0. :
http://www.egger-gis.at/shapefile-projectionfinder/
Before i start to develop a OPEN JUMP PLUGIN i want to ask which databases OPEN
JUMP uses for transformations?
I the last weeks i saw in your email traffic that you included different
sources of projection definitions (EPSG, ESRI, user defs, ...)?
And is it possible to make different .prj files? You know ESRI can not read WKT
by OGC...
Best regards,
Manfred Egger
Alois-Schrott-Str. 34
6020 Innsbruck
Austria
Web: http://egger-gis.at
-----Original Message-----
From: "Micha?l Michaud"
<m.michael.mich...@orange.fr<mailto:m.michael.mich...@orange.fr>>
Sent: Thursday, August 4, 2016 5:32pm
To:
jump-pilot-devel@lists.sourceforge.net<mailto:jump-pilot-devel@lists.sourceforge.net>
Subject: Re: [JPP-Devel] Add SRID and units to Task
Hi Peppe,
Your explanation is clear.
I tend to be on the same opinion as Jukka on this topic because I
generally use OpenJUMP as a toolbox, and I generally know exactly what I
want to do with my data.
But I admit that to visualize heterogeneous data, OpenJUMP has not much
to offer to the user to solve projection problems, and the beginner can
be bothered by the lack of assistance.
Here are a few recommandation :
1 - Projection issues may be tricky. It is magic as long as the only
need is visualization, but if the user need to reproject his dataset, he
must be aware of the consequences (reversibility, topology
consistency...). Last time I have been screwed by a projection problem
is with FME. I imported shapefiles with a prj in a project using the
"same" projection. It was supposed to be a no-op (doing nothing), except
that FME did a transformation from projection A (defined by prj
parameters) to projection A (defined by internal FME parameters), which
resulted in an invisible switch of a few micrometers difficult to see,
but which broke the consistency with another layer (which did not follow
the same process). Of course this can be avoided in FME, but this is
just an example to illustrate that without a great care, something
supposed to be magic may become dramatic.
2 - From my point of view, one of the most difficult problem is to be
able to recognize that two coordinate reference system with different
origins (different registries, different formats, different libraries,
different definitions) represent the same thing (see the above problem
with FME). I think you already worked on that problem.
3 - Your mail explains quite clearly what already exists and where you
want to go. I think that to anticipate difficulties, we can suppose that
a SRID is associated to the task and try to define OpenJUMP behaviour in
different situations :
- default behaviour when creating a new task : asking for a srid or not
? it is a good thing if OJ can infer information from prj files or other
sources, but I don't like having to answer esoteric questions before I
can start working.
- task without srid : does it take the srid of the first layer imported
? What if layers without srid are already imported ?
- can we change the srid of a task if layers with srid are already
imported ?
- importing a layer with a different srid : 1) the layer is just tagged
(layer srid mismatch task srid), 2) the layer is automatically
reprojected by the renderer ? 3) the user is invited to reproject the
layer ? 4) There are some options to define OpenJUMP behaviour
- how to deal with layers without projection : can we import them in a
task with a srid ? can we edit them ? Do we set the task projection to
the layer projection automatically ?
- if a reprojected layer is not editable, an interesting option would be
to set the task srid to the selected layer srid (-> makes the selected
layer editable, and reproject other layers)
- etc.
4- Implementation : no real opinion. Ede's advice will certainly make
the code more flexible, but also a bit more complex. And how to
represent the coordinate system property ? Another difficult question.
We already have SRID represented by an int at the geometry level (JTS)
and a CoordinateSystem at the FeatureSchema level. IMHO, the first is a
bit too lightweight (cannot handle non EPSG crs). The second is too
lightweight if we want to use it to effectively transform coordinates
(cannot handle much transformations) and too heavyweight if we just use
it as a reference to be used by CTS library (or any other).
My 3 cents
Michael
Le 03/08/2016 ? 15:13, Gmail a ?crit :
> LoopThis thread needs a larger explanation.
> I try to simplify it.
> other GIS like Kosmo or GVSig implemented Coordinate system framework
> following these steps:
> a) first step they add a projection object to the task (usually as EPSG or
> ESRI code). In Kosmo user has to set that. QGIS also allows to set Task
> projection loading that from the first loadedf file (with SRID).
> b) QGIS define the Unit of the task from SRID ( ex. 4326>degree,
> 32632>metre) while GvSig And Kosmo require to set it manually.
> c) a projection object is set to each loaded layer. This is done reading
> layer metadata or manually
> d) if the task and the layer projection object are different a
> transformation should be set. Those software use ( for vector) proj4
> libraries. In this step Qgis and newer gvsig allows on fly reprojection.
> e) this transformation is taken into account only by layer renderes on the
> workbench. Which changes geometry before drawing it.
> This transformation is saved into project file and taken into account
> whenever the project file is loaded.
> f) Note that Kosmo (and probably Gvsig) doesn't allow any spatial operation
> on reprojected layers. The only way to modify them is to save them
> reprojected.
>
> Recently I did few modifications on shape file reading in order to expand
> capability to set layer SRId when reading file. Layer properties plugins
> already have this capability for both raster and vector ( included
> geotif*). Together with database and wfs capability to record layer srid we
> probably get almost point C of my list.
>
> My idea is to work on point A and B, integrating parts if my measure plugin
> in to OJ core in order to have measurements\zoom when task projection is
> geographic or possibility that oj display meter or feet unit on
> measurements \ scale bar.
> The other points can be faced in the future, including in fly reprojection.
>
> My project:
> 1) Oj already as a srid registry embedded that I added when I defined srid
> detection capability from auxiliary files. It is a simple list of
> projection, a series of lines with only srid number and a proj. description
> ( ex <32632>;<WGS 84 UTM zone 32>), build using proj4 registries and excel.
> I could expand each line with unit ( ex <32632>;<WGS 84 UTM zone 32>;<metre>)
> 2) expand Task class with srid code and unit. User can define manually .
> 3) modify measure /zoom plugins according units, meter, foot, degree ( in
> this last case I would limit only to wgs84 ) using classes fro my measure
> plugin.
>
> Peppe
>
>
>
>
>
> *
>
>
>
> Inviato con AquaMail per Android
> http://www.aqua-mail.com
>
>
> Il 03 agosto 2016 12:32:48 edgar.sol...@web.de<mailto:edgar.sol...@web.de> ha
> scritto:
>
>> hey Peppe,
>>
>> On 03.08.2016 11:11, Giuseppe Aruta wrote:
>>> Hi all,
>>> The title explains what is my idea. In a possible future we can extend OJ
>>> projection capabilities. And the 1st step I would explore is to add SRID
>>> code to a task (to centralize possible transformations)
>> can you elaborate?
>>
>>> and unit of measurements (retriving from SRID, which will affect other
>>> plugins/tools like measure tools, measure area/length, display scales etc,
>>> especially for Geographic coordinate systems).
>> same here.
>>
>>> I gave a look at Task class , should I implement (srid and unit) as
>>> properties into the associate xml file? Does it breaks compatibility?
>> ..ede
>>
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