[OpenLayers-Users] Performance
Mr. Rahul Teni
rahul_g_teni at yahoo.com
Mon Aug 31 07:53:55 EDT 2009
Hi,
Can you please let me know some more details about your configuration as we have done some tuning for performance.
I would like to know how frequently you will be changing data and details like that.
We are using tilecache with Openlayer, mapserver and fastCGI with lighttpd server.
Thanks,
Rahul G. Teni
Cynosure Software Solutions
MS BITS,BE Comp
--- On Mon, 8/31/09, users-request at openlayers.org <users-request at openlayers.org> wrote:
From: users-request at openlayers.org <users-request at openlayers.org>
Subject: Users Digest, Vol 35, Issue 91
To: users at openlayers.org
Date: Monday, August 31, 2009, 11:46 AM
Send Users mailing list submissions to
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To subscribe or unsubscribe via the World Wide Web, visit
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than "Re: Contents of Users digest..."
Today's Topics:
1. Performance (Rahn Hanno (rahn))
2. Re: switching default layer before initial map display
(Mr. Rahul Teni)
----------------------------------------------------------------------
Message: 1
Date: Mon, 31 Aug 2009 07:31:31 +0200
From: "Rahn Hanno (rahn)" <rahn at zhaw.ch>
Subject: [OpenLayers-Users] Performance
To: <users at openlayers.org>
Message-ID:
<3F643797A078EB4FB028800809680984017C0A71 at langouste.zhaw.ch>
Content-Type: text/plain; charset="iso-8859-1"
Hello list,
I have another question. I have a solution with 4 different maps. In this maps there will always be the same geometries (polygons) but the polygons will style with a sld file in different ways.
Now my question. My solution is not very fast. Are there possibilities for upgrade the performance of the maps? I think you can do some things to get a higher performance, but I don't know what someone has to do for this. Are there some rules or tipps from you to get a better performance?
My data comes from a postgreSQL/postgis database. You can see an example here:
http://webgis.hsw.ch/GINES/Start.php
Is it better to use tiles for this?
Greetings
Hanno Rahn
------------------------------------------
Hanno Rahn, Dipl.-Ing. (FH) Geoinformatik
ZHAW Z?rcher Hochschule f?r Angewandte Wissenschaften Umwelt und Nat?rliche Ressourcen
Fachstelle Geoinformatik
Gr?ental, Postfach CH-8820 W?denswil
Tel +41 (0)58 934 5592
Fax +41 (0)58 934 5580
hanno.rahn at zhaw.ch
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Message: 2
Date: Sun, 30 Aug 2009 23:16:02 -0700 (PDT)
From: "Mr. Rahul Teni" <rahul_g_teni at yahoo.com>
Subject: Re: [OpenLayers-Users] switching default layer before initial
map display
To: stephane.poirier at usherbrooke.ca
Cc: users at openlayers.org
Message-ID: <896353.97732.qm at web65602.mail.ac4.yahoo.com>
Content-Type: text/plain; charset="iso-8859-1"
Hi Stephane,
>From your question what i understood is you want to switch between different google layers. Am i right?
It can be achieved by creating all google layer as base layer and then you can switch between those. If you want sample code i can share that with you.
Let me know if i am on correct path?
Thanks,
Rahul G. Teni
Cynosure Software Solutions
MS BITS,BE Comp
--- On Mon, 8/31/09, users-request at openlayers.org <users-request at openlayers.org> wrote:
From: users-request at openlayers.org <users-request at openlayers.org>
Subject: Users Digest, Vol 35, Issue 90
To: users at openlayers.org
Date: Monday, August 31, 2009, 10:22 AM
Send Users mailing list submissions to
??? users at openlayers.org
To subscribe or unsubscribe via the World Wide Web, visit
??? http://openlayers.org/mailman/listinfo/users
or, via email, send a message with subject or body 'help' to
??? users-request at openlayers.org
You can reach the person managing the list at
??? users-owner at openlayers.org
When replying, please edit your Subject line so it is more specific
than "Re: Contents of Users digest..."
Today's Topics:
???1. Re: Exception, but why? (Marc Jansen)
???2. Best way to implement hover/click highlighting??? of polygons
? ? ? (Peter Becker)
???3. switching default layer before initial map??? display
? ? ? (stephane.poirier at usherbrooke.ca)
???4. vector layers don't display in internet explore??? 8.0.6001
? ? ? anymore (stephane.poirier at usherbrooke.ca)
???5. Re: Best way to implement hover/click??? highlighting of
? ? ? polygons (Eric Lemoine)
----------------------------------------------------------------------
Message: 1
Date: Sun, 30 Aug 2009 20:07:34 +0200
From: Marc Jansen <jansen at terrestris.de>
Subject: Re: [OpenLayers-Users] Exception, but why?
To: Maren Kiehl <maren.kiehl at gmx.de>
Cc: users at openlayers.org
Message-ID: <4A9ABFE6.7060401 at terrestris.de>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hi Maren,
it is very hard to guess the source of that behaviour since we do not
see any code. Is there any chance you can post a minimal example that
shows this behaviour?
Have your tried the code with Firebug being disabled? Is the error
console still showing the error?
-- Marc
Maren Kiehl schrieb:
> Hi at all.
>
> I programmed an application with a wfs-layer which opens a popup with
> some informations to a special point by clicking it.
> Everything works without a problem but in Mozilla the Firebug (1.4.2)
> throws the following exception:
>
> uncaught exception: [Exception... "Component returned failure code:
> 0xc1f30001 (NS_ERROR_NOT_INITIALIZED) [nsIXMLHttpRequest.send]"
> nsresult: "0xc1f30001 (NS_ERROR_NOT_INITIALIZED)" location: "JS frame ::
> http://localhost/openl/lib/OpenLayers/Request/XMLHttpRequest.js ::
> anonymous :: line 200" data: no]
>
> Whats wrong? And why does the programm throw it although everything is fine.
>
> Thanks for help.
> Best regards
> Maren
> _______________________________________________
> Users mailing list
> Users at openlayers.org
> http://openlayers.org/mailman/listinfo/users
>
>???
------------------------------
Message: 2
Date: Mon, 31 Aug 2009 09:34:44 +1000
From: Peter Becker <pbecker at itee.uq.edu.au>
Subject: [OpenLayers-Users] Best way to implement hover/click
??? highlighting??? of polygons
To: users at openlayers.org
Message-ID: <200908310934.44718.pbecker at itee.uq.edu.au>
Content-Type: text/plain; charset="us-ascii"
Hello all,
I know it is a bit of a broad question, but after quite a few experiments I
still feel a bit puzzled as to which way I want to set up a map in our
application. The map displays certain areas (catchments, bay areas, etc.). The
user should be able to click on those areas, which then shows detailed
information in a side bar (div on the same level as the map's div).
We are using a stack with PostGIS and GeoServer and I managed to get the basic
functionality working in different ways, e.g. using GeoServer's map previews as
example as well as http://openlayers.org/dev/examples/getfeature-wfs.html .
But getting it to work is only one thing, I'd like to get some more
understanding on the implications of different approaches. The two main
concerns for me at the moment are the browser support and the number of
roundtrips some approaches seem to take.
I saw http://trac.openlayers.org/wiki/Browsers -- does that mean all
OpenLayers features are fully supported in each of these? Can I e.g. use an
all-vector approach for the overlays and expect them to work?
And regarding the round trips: I would like the map view not to hit our server
more than once per interaction -- mostly to keep the map snappy, but also to
not but unnecessary burden on the server. The UI won't allow arbitrary zooming
and panning, so bounds should get invalidated only as a result of some custom
callback.
I was thinking along the lines of loading all polygons as WFS layer -- is that
the way to do it? Should I set a specific strategy? I can't find much
documentation on strategies.
Thanks for any hints/experiences you are willing to share.
Cheers,
? Peter
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Message: 3
Date: Sun, 30 Aug 2009 21:50:29 -0400
From: <stephane.poirier at usherbrooke.ca>
Subject: [OpenLayers-Users] switching default layer before initial map
??? display
To: <users at openlayers.org>
Message-ID: <91F4403121E140F78EAF096F75BDB814 at spoirierdell>
Content-Type: text/plain; charset="iso-8859-1"
Hi All,
With the following code, I created a few google layers. Google streets gets to be the default. Now, how can I change the default layers to be, say, the google hybrid map?
if(myepsg=="EPSG:900913")
{
? ? googlestreetsLayer=new OpenLayers.Layer.Google("Google Streets",{"sphericalMercator": true,minZoomLevel: 2});
? ? googlephysicalLayer=new OpenLayers.Layer.Google("Google Physical",{type: G_PHYSICAL_MAP, "sphericalMercator": true,minZoomLevel: 2});
? ? googlesatelliteLayer=new OpenLayers.Layer.Google("Google Satellite",{type: G_SATELLITE_MAP, "sphericalMercator": true,minZoomLevel: 2});
? ? googlehybridLayer = new OpenLayers.Layer.Google("Google Hybrid",{type: G_HYBRID_MAP, "sphericalMercator": true,minZoomLevel: 2});
}
Stephane Poirier, M.Sc. Optic Physics
Remote Sensing Application Software Developer
Universit? de Sherbrooke
2500 Bd Universit?, Sherbrooke, Qc J1K 2R1 Canada
www.usherbrooke.ca/cartel
Stephane.Poirier at Usherbrooke.ca
+1 (514) 509-8833 (actual work site telephone)
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Message: 4
Date: Sun, 30 Aug 2009 23:02:22 -0400
From: <stephane.poirier at usherbrooke.ca>
Subject: [OpenLayers-Users] vector layers don't display in internet
??? explore??? 8.0.6001 anymore
To: <users at openlayers.org>
Message-ID: <0CDA8FA3C5274F4596374392E19D5B25 at spoirierdell>
Content-Type: text/plain; charset="iso-8859-1"
Hi All,
My vector layers do display fine in Firefox, Chrome, Safari but don't display at all in IE 8.0.6001. I was using IE 8.0 compatibility view to have proper vector layer display until recently. But now, Ie 8.0 compatibility view does not seems to work or fix that issue anymore.
Should I write specific code for IE 8.0? Or, is there a patch for IE 8.0?
Stephane Poirier, M.Sc. Optic Physics
Remote Sensing Application Software Developer
Universit? de Sherbrooke
2500 Bd Universit?, Sherbrooke, Qc J1K 2R1 Canada
www.usherbrooke.ca/cartel
Stephane.Poirier at Usherbrooke.ca
+1 (514) 509-8833 (actual work site telephone)
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Message: 5
Date: Mon, 31 Aug 2009 06:52:20 +0200
From: Eric Lemoine <eric.lemoine at camptocamp.com>
Subject: Re: [OpenLayers-Users] Best way to implement hover/click
??? highlighting of polygons
To: Peter Becker <pbecker at itee.uq.edu.au>
Cc: users at openlayers.org
Message-ID:
??? <ca7da9120908302152p3714e141y83f27456a0a544d1 at mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
On Monday, August 31, 2009, Peter Becker <pbecker at itee.uq.edu.au> wrote:
> Hello all,
Hi
>
> I know it is a bit of a broad question, but after quite a few experiments I still feel a bit puzzled as to which way I want to set up a map in our application. The map displays certain areas (catchments, bay areas, etc.). The user should be able to click on those areas, which then shows detailed information in a side bar (div on the same level as the map's div).
>
> We are using a stack with PostGIS and GeoServer and I managed to get the basic functionality working in different ways, e.g. using GeoServer's map previews as example as well as http://openlayers.org/dev/examples/getfeature-wfs.html .
>
> But getting it to work is only one thing, I'd like to get some more understanding on the implications of different approaches. The two main concerns for me at the moment are the browser support and the number of roundtrips some approaches seem to take.
>
> I saw http://trac.openlayers.org/wiki/Browsers -- does that mean all OpenLayers features are fully supported in each of these? Can I e.g. use an all-vector approach for the overlays and expect them to work?
Yes, vector layers are supposed to work in every listed browser. But
you will get different results in terms of performance from one
browser to another. For example IE will require much more time than FF
and Chrome to display geometries on vector layers. Depending on the
number of geometries, display time may be so long so that it can
become unacceptable.
>
> And regarding the round trips: I would like the map view not to hit our server more than once per interaction -- mostly to keep the map snappy, but also to not but unnecessary burden on the server. The UI won't allow arbitrary zooming and panning, so bounds should get invalidated only as a result of some custom callback.
>
> I was thinking along the lines of loading all polygons as WFS layer -- is that the way to do it?
Possibly. Again it depends on the number of objects you need to
display and the browsers you want to support. I'd recommend doing
experiments with your dataset.
> Should I set a specific strategy?
You can use the BBOX strategy so that only features included in the
current extent of the map are fetched and displayed. As the map is
moved new features will be fetched from the server.
Cheers,
> I can't find much documentation on strategies.
>
> Thanks for any hints/experiences you are willing to share.
>
> Cheers,
>???Peter
--
Eric Lemoine
Camptocamp France SAS
Savoie Technolac, BP 352
73377 Le Bourget du Lac, Cedex
Tel : 00 33 4 79 44 44 96
Mail : eric.lemoine at camptocamp.com
http://www.camptocamp.com
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