#331: extend the vector modell to be able to calculate real circular segments
and
circles => for calculating real circular buffers of points
--------------------------+-------------------------------------------------
Reporter: mlechner | Owner: grass-dev@lists.osgeo.org
Type: enhancement | Status: new
Priority: minor | Milestone: 7.0.0
Component: Vector | Version: svn-trunk
Resolution: | Keywords: vector model curve circle buffer
Platform: All | Cpu: All
--------------------------+-------------------------------------------------
Changes (by hamish):
* priority: major => minor
* platform: Unspecified => All
* version: unspecified => svn-trunk
* component: default => Vector
* cpu: Unspecified => All
Comment:
Replying to [ticket:331 mlechner]:
> It would be interesting to extend the grass vector model to be
> able to construct curves for using them to create real circular
> buffers instead of approximating them using several vertices.
>
> I just was wondering - isn't it more effectice saving a buffer
> using one vertice and a "curved line" than using several points
> and approximate the circle.
>
> An appproximated buffer could still be in the data - only newly
> calculated buffers are more correct then.
Hi,
I remember some years ago seeing a presentation about a similar idea. The
talk was entitled “The circle tree – a hierarchical structure for
efficient storage, access and multi-scale representation of spatial data”,
by Antoni Moore.
http://www.business.otago.ac.nz/SIRC/conferences/2002_SIRC/17_Moore.pdf
(and also another talk at SIRC 2003)
Tony's office is just down the hall, if needed I can ask him where it
lead. ISTR they had a prototype and did some efficacy testing.
(or you can just use that as scholar.google search terms for
publications...)
perhaps this wish is "easier said than done".
see also the symbol library, which has a hybrid cartesian/polar polyline
input method.
Hamish
--
Ticket URL: <http://trac.osgeo.org/grass/ticket/331#comment:1>
GRASS GIS <http://grass.osgeo.org>
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