Hi,
You can configure the precision model used by Hibernate Spatial. To
do that, create a file "hibernate-spatial.cfg.xml" and put it on the
classpath.
You can configure the precision model like so:
<?xml version="1.0" encoding="UTF-8"?>
<hibernate-spatial>
<precision_model>FIXED</precision_model>
<precision_model_scale>5</precision_model_scale>
</hibernate-spatial>
This precision model is used then for all geometries that are loaded
from the database. Hopefully, this will help you resolve the issue.
Regards,
Karel
On 13 Aug 2009, at 17:34, Pablo José Cabrera Muñoz wrote:
> Hello everyone,
>
> I've been using hibernate spatial for a while and it's been a great
> experience so far.
>
> Although, I'm stuck with an application requirement that has to
> validate
> if a given polygon is within another polygon. The thing is that
> there is
> some reprojection made both in the server-side (Java) and the
> client-side (Javascript / OpenLayers) and when the user draws the
> exact
> same polygon (using the OpenLayers API with Snapping activated on the
> validated polygon) there is a small difference between those two
> polygons and when I use "pol1.contains(pol2)" or even
> "pol2.contains(pol1)" they both says "false", so I noticed that
> they are
> not quite equal and the difference is really small. I think that I
> could
> use a fixed precision model as said in this thread
> (
http://n2.nabble.com/hibernate-spatial.cfg.xml-td1482530.html) to
> avoid
> this small difference.
>
> And the question is:
>
> Will hibernate-spatial use this precision when using spatial
> operations
> and functions? (I guess not, because it only builds the java objects
> using that give precision model).
>
> If not, given that I save my geometries with a specific precision
> model,
> will they be preserved within the database? (I guess Yes, but it
> does't
> really matter, since my objects will be returned with that given
> precision).
>
> I think that's the way it would work, but I can't be sure of
> that... Any
> thoughts?
>
> --
> Pablo Cabrera
> Analista Implementador
> Softplan/Poligraph
> Fone: (048) 3027.8000
>
http://www.softplan.com.br> Sistema da Qualidade Certificado ISO 9001:2000
>
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