[geos-devel] Planar point location query?

Okeefe, Charlie (Mission Systems) Charlie.Okeefe at ngc.com
Tue Feb 14 00:27:14 EST 2006


I am actually already using openscenegraph - I have a 3d earth with
terrain and images, but no vector stuff yet. It wasn't obvious to me how
to do planar point location using openscenegraph though. I will have to
look again.

Charlie

-----Original Message-----
From: geos-devel-bounces at geos.refractions.net
[mailto:geos-devel-bounces at geos.refractions.net] On Behalf Of Paul
Ramsey
Sent: Monday, February 13, 2006 2:59 PM
To: GEOS Development List
Subject: Re: [geos-devel] Planar point location query?

Like osgPlanet?  <http://www.ossim.org/tiki-read_article.php? 
articleId=3>
Or Punt? <http://punt.sourceforge.net/>

For vector computational geometry, GEOS is a good choice, but for 3d
viewer purposes there are much more developed frameworks to hang your
stuff off of.  The two links above are examples of developed projects,
the link below is more infrastructural, but still more on- point than
GEOS in particular.

Openscenegraph: <http://www.openscenegraph.org/>

Don't re-invent the wheel on this one, there are lots of open source
starting points to work with.

Paul


On 13-Feb-06, at 10:13 AM, Okeefe, Charlie (Mission Systems) wrote:

> Well, more broadly, I'm writing a 3D earth viewer for terrain, raster 
> and vector data as well as overlaid function plots. One early issue 
> that sparked my question was, if the user clicks somewhere with the 
> mouse, quickly determine the region the user clicked. I suppose I am 
> looking for a sort of computational geometry framework, especially for

> dealing with vector data. So far I use GDAL for accessing geospatial 
> data but I think that is just an importer/exporter. Whether to use a 
> database or not, I'm not sure about yet. Can you suggest tools (LGPL 
> or similar) that might be ideal for this? Thanks again for your 
> response.
>
> Charlie
>
> -----Original Message-----
> From: geos-devel-bounces at geos.refractions.net
> [mailto:geos-devel-bounces at geos.refractions.net] On Behalf Of Paul 
> Ramsey
> Sent: Sunday, February 12, 2006 7:13 PM
> To: GEOS Development List
> Subject: Re: [geos-devel] Planar point location query?
>
> That's a pretty easy question Charlie, and almost any spatial 
> framework at all will answer it.  Whether GEOS is the tool for the job

> depends on what your larger architectural context is.  Is the question

> always going to be that easy, or will it get harder, larger, more 
> frequent?  Would the flexibility of a database help?  If time-to- 
> deployment is an issue, either using PostGIS and SQL as the interface,

> or Mapserver and the Mapserver CGI as an interface can give you a 
> system that answers that kind of a question in half an hour or less of

> setup.
>
> P
>
> On 12-Feb-06, at 5:22 PM, Okeefe, Charlie (Mission Systems) wrote:
>
>> I'm wondering if GEOS is (capable of) / (a good fit for) answering 
>> the
>
>> following problem:
>>
>> Given a static database of countries and oceans in the world, each 
>> defined by a set of polygons, answer the query, "which country or 
>> ocean contains point P?" where P has some arbitrary latitude and 
>> longitude.
>>
>> Thanks for any help!
>>
>> Charlie
>> _______________________________________________
>> geos-devel mailing list
>> geos-devel at geos.refractions.net
>> http://geos.refractions.net/mailman/listinfo/geos-devel
>
> _______________________________________________
> geos-devel mailing list
> geos-devel at geos.refractions.net
> http://geos.refractions.net/mailman/listinfo/geos-devel
> _______________________________________________
> geos-devel mailing list
> geos-devel at geos.refractions.net
> http://geos.refractions.net/mailman/listinfo/geos-devel

_______________________________________________
geos-devel mailing list
geos-devel at geos.refractions.net
http://geos.refractions.net/mailman/listinfo/geos-devel



More information about the geos-devel mailing list