[postgis-users] Postgis and open layers

[Luigi Castro Cardeles]

Hi,

hum, maybe what you want with st_buffer is a WPS? this service let you do
dynamic stuff with your data. But integrate this with openlayers... i don't
do that... yet :D.

if your data are in postgis, you could put a WFS or WMS, with many tables.
You can create a temp table, or a view from a select (passing the variables
via a form) and them you put that view at mapserver (add an entry in
geometry_columns for that view).
If you don't want to edit your data (change the vectors) you could make many
WMS and put a view(created from a buffer) in a another WMS, so when the user
want to do a buffer stuff, he do that only at that table or some features
from that table.

Making a dynamic buffer can turn in a performance nightmare... i think.

Maybe you could cache some buffer to gain speed. just some ideas.

[]'s

2008/8/27 Gustavo Ces <g.ces at pettra.es>

>  Hi Luigi,
>
>     but with WFS  i´ll have to create the table for each query and serve
> that table, won´t i? I don´t know very well WFS, but if a i want to make a
> buffer table with ST_buffer ( for example) i have to create a table and then
> serve it as WFS ( automatically, coding it in my application). If a i need
> to change the distance in St_Buffer funcion, then i have to recreate that
> table and serve it as WFS... or maybe there is a something in WFS
> specification to make these types of querys? ( not queries over the result
> table!)
> What i want to do is postgis analysis capacity viewed in open layers. Maybe
> there is a better solution...
> Thanks for answering,
>
> Gus
>
> ----- Original Message -----
> *From:* Luigi Castro Cardeles <luigi.cardeles at gmail.com>
> *To:* PostGIS Users Discussion <postgis-users at postgis.refractions.net>
> *Sent:* Tuesday, August 26, 2008 5:17 PM
> *Subject:* Re: [postgis-users] Postgis and open layers
>
> Hi,
>
> try to create wms and wfs. They are supported by openlayers.
> []'s
>
> 2008/8/26 Gustavo Ces <g.ces at pettra.es>
>
>>  Hi all,
>>
>>     i was searching info about viewing postgis data in openlayers. Which
>> would be the better approach to draw dynamic queries in postgis? Views not
>> valid to me because needed queries with variables.
>>     One solution could be making with dynamic web language the query to
>> create an asGML/KML/... file and then render it in open layers... Any other
>> idea?
>>     Thanks in advance,
>>
>> Gus
>>
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>
>
> --
> Luigi Castro Cardeles
>
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-- 
Luigi Castro Cardeles
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