[geos-devel] Can current release do polygon overlay analysis?

[Paul Ramsey]

I may have spoken out of turn: GEOS does union, intersection, buffer.
Overlay analysis can be done through the repeated application of the 
intersection function.  Take two sets of features, A and B. For feature 
A(1), find all features in B that are nearby and run an intersection 
against them. For each intersected resultant B(n), merge the attributes 
of A(1) and B(n). Wash, rinse, repeat.
Paul

On Thursday, October 23, 2003, at 02:49 PM, Hisaji Ono wrote:

> Thank you, Paul.
>
> ----- Original Message -----
> From: "Paul Ramsey" <pramsey at refractions.net>
> To: "GEOS Development List" <geos-devel at geos.refractions.net>
> Sent: Friday, October 24, 2003 6:46 AM
> Subject: Re: [geos-devel] Can current release do polygon overlay 
> analysis?
>
>
>> Yes, it does all of that. You may find robustness failures in the
>> overlay,intersection,buffer code, but it should handle most cases
>> gracefully.
>>
>
>  Oh, it's very nice!! Thank you for Canadian People.
>
>  By the way, any sample codes for overlay analysis will be provided?
>
>
> Regards.
>
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      Paul Ramsey
      Refractions Research
      Email: pramsey at refractions.net
      Phone: (250) 885-0632