[OpenLayers-Users] question about overlays

[Scott Davis]

GeoServer has some really nice SLD examples.

If you download the latest <http://downloads.sourceforge.net/ 
geoserver/geoserver-1.5.0-RC4-bin.zip>, it includes the Jetty web  
server. Just change to geoserver/bin and type ./startup.sh. GeoServer  
is Java based -- you'll need at least JDK 1.4 installed in order to  
run it, but other than that you have no other external dependencies.

Once it is running, check out <http://localhost:8888/geoserver/ 
preview/topp_states.html>. It's funny that you mention population --  
this map is a choropleth based on exactly that value.

<http://docs.codehaus.org/display/GEOSDOC/OGC+SLD+Explanations+and 
+Samples> gives you many more SLD examples of the copy/n/paste variety.

Cheers,
s

Scott Davis
scott at davisworld.org



On Apr 10, 2007, at 8:02 PM, bradleyspencer wrote:

> Adam,
>
>
>
> The hard way to go is to use the OGC specs for SLD definitions,  
> alternatively you could just search for other SLD files and cut and  
> paste try http://www.cubewerx.com.au/mesh04.xml.
>
>
>
> However, your WMS service must support SLDs so check that first, if  
> not you might like to consider CubeWerx’s products ;)
>
>
>
> Other than that you can use the DemoDrapes demo I sent you as an  
> example of how to apply SLDs in an OL application as its not  
> clearly documented.
>
>
>
> Cheers,
>
>
>
> Brad Spencer
>
> General Manager
>
> CubeWerx Australia Pty Ltd
>
> ABN: 37 115 163 285
>
> Mob: +61 (0)404 841 131
>
> Tel/Fax: +61 (0)2 9481 7024
>
> mailto:brad at cubewerx.com.au
>
> http://www.cubewerx.com.au
>
>
>
> -----Original Message-----
> From: Adam Eskreis [mailto:aeskreis at gmail.com]
> Sent: Wednesday, 11 April 2007 11:55 AM
> To: brad at cubewerx.com.au
> Cc: users at openlayers.org
> Subject: Re: [OpenLayers-Users] question about overlays
>
>
>
> very interesting...does anyone have any resources/tutorials for me  
> to get started with this stuff?
>
> On 4/10/07, bradleyspencer < brad at cubewerx.com.au> wrote:
>
> Adam,
>
>
> Have you thought about creating the thematic overlays interactively  
> using SLDs?
>
>
>
> See http://www.cubewerx.com.au/DemoDrapes.html
>
>
>
> Cheers,
>
>
>
> Brad Spencer
>
> General Manager
>
> CubeWerx Australia Pty Ltd
>
> ABN: 37 115 163 285
>
> Mob: +61 (0)404 841 131
>
> Tel/Fax: +61 (0)2 9481 7024
>
> mailto:brad at cubewerx.com.au
>
> http://www.cubewerx.com.au
>
>
>
> -----Original Message-----
> From: Adam Eskreis [mailto:aeskreis at gmail.com]
> Sent: Wednesday, 11 April 2007 10:24 AM
> To: users at openlayers.org
> Subject: [OpenLayers-Users] question about overlays
>
>
>
> I am currently constructing a map with many thematic layers.  For  
> those that don't know, a thematic layer is a layer which color  
> codes certain polygons based on a certain field, such as population  
> density or something like that.  I want these thematic layers to be  
> able to be turned on and off.  I have each thematic layer set up as  
> a seperate group in the mapfile, and i set up each one as a  
> seperate overlay in openlayers.  However, my problem is now i have  
> around 40 overlays on my OpenLayers map.  Is this too many?  It is  
> taking a long time to load the map now.  So my question, is having  
> a lot of overlays bad practice?  If so, how can i cut down on  
> overlays, but still be able to have each thematic layer be able to  
> be shown on demand by the user? Thanks.
>
> -Adam
>
>
>
>
> _______________________________________________
> Users mailing list
> Users at openlayers.org
> http://openlayers.org/mailman/listinfo/users