[mapserver-users] RE: Rendering overlapping data

[Peter Hopfgartner]

Ludwig Kniprath wrote:
> I dont't think, Mapserver has the out-of-the-box possibility to render the overlapping parts of polygons in a special way. Perhaps you could try to create a separate layer (f. e. in Postgis with a special geo-query), that just shows these overlapping parts. But also then I think its difficult to query and to render the case, that three or more polygons do overlap.
>
> Ludwig
>
>   
Hi Ludwig,

out of curiosity:

 How do other software packages handle this case?

 Are there some best practices? For example dividing the intersection 
area into stripes and cycle through the colors of the overlapping data?

 Does GeoServer have some way to visualize overlapping data?

 Would it make sense to collect some requirements to formulate an RFC?

Regards,

Peter
>> Message: 2
>> Date: Mon, 21 Dec 2009 17:22:44 +0100
>> From: Peter Hopfgartner <peter.hopfgartner at r3-gis.com>
>> Subject: [mapserver-users] Rendering overlapping data
>> To: mapserver-users at lists.osgeo.org
>> Cc: d'Orio Pietro <pietro.dorio at r3-gis.com>
>> Message-ID: <4B2FA0D4.7020700 at r3-gis.com>
>> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>>
>> Dear list members
>>
>> We would like to visualize a layer with data, where polygons with 
>> different classes may overlap. Using transparency, "new" colors are 
>> introduced, e.g. if I overlap a blue and a red polygon I get an violet one.
>>
>> Is there a way to show overlapping polygons in stripes with cycling 
>> colors, or as a checker board? How do people handle this?
>>
>> Regards,
>>
>> Peter
>>
>> -- 
>>
>> Dott. Peter Hopfgartner
>>
>> R3 GIS Srl - GmbH
>> Via Johann Kravogl-Str. 2
>> I-39012 Meran/Merano (BZ)
>> Email: peter.hopfgartner at r3-gis.com
>> Tel. : +39 0473 494949
>> Fax  : +39 0473 069902
>> www  : http://www.r3-gis.com
>>     
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>   


-- 
 
Dott. Peter Hopfgartner
 
R3 GIS Srl - GmbH
Via Johann Kravogl-Str. 2
I-39012 Meran/Merano (BZ)
Email: peter.hopfgartner at r3-gis.com
Tel. : +39 0473 494949
Fax  : +39 0473 069902
www  : http://www.r3-gis.com