[Geoserver-jp] CQL and DWITHIN

[Toshikazu SETO (MBPro)]

Mario-san

Thank you for the some informations! I try to access your Web site.
Very interesting!

DWUTHIN is here:
http://lyceum.massgis.state.ma.us/wiki/doku.php?id=wfs:dwithin

Additionaly, I mentioned WPS with Geoserver.
Best regards.



Mario Basa さんは書きました:
> Hello Seto-san,
> 
> What I really like about DWITHIN, and CQL in general, is that it easy
> to make complicated filters with no programming.
> 
> My little demo of DWITHIN is here:
> 
> http://demo2.orkney.jp/geothematics/census2005_cql.html
> 
> it contains a lot of bugs, but it does show what DWITHIN filters can do.
> 
> Regards,
> 
> Mario.
> 
> 
> 
> On Tue, Oct 12, 2010 at 10:01 PM, Toshikazu SETO (MBPro)
> <gr0008sf ＠ ed.ritsumei.ac.jp> wrote:
>> Mario-san
>>
>> Thank you for very nice information!
>>
>> I hopefully try to ovarley some layers into geothematics.
>> For example, facilities point data (cf.shp) and census polygon data.
>>
>> So, I think CQL and DWITHIN is very interesting.
>> I want to try this sample.
>>
>> best regards.
>>
>> Mario Basa さんは書きました:
>>> Hello again.
>>>
>>> One of the most useful CQL filter for me now is DWITHIN, because with
>>> just one line:
>>>
>>> cql_filter: dwithin(the_geom,POINT( x y ),radius,"meters")
>>>
>>> I was able to create a radius filter for both WFS and WMS  requests.
>>> The radius parameter though has to be in the same units as that of the
>>> layer, so it is best to convert the layer's projection so that the
>>> units will be in meters.
>>>
>>> Anyway, with just that one line, it is easy to create an application
>>> that can do Site Analysis and show if a site has a 1 million
>>> population within a 10 kilometer radius (半径10km＝人口100万人以上). This is
>>> actually one the requirements for a Cosco site:
>>>
>>> http://www.costco.co.jp/real.htm
>>>
>>> Attached are a couple of screen shots of my little application that
>>> uses DWITHIN.
>>>
>>> Regards,
>>>
>>> Mario.
>>>
>>>
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>>>
>>>
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>>>
>>>
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>>>
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>>
>