On Mar 2, 2008, at 12:03 PM, [EMAIL PROTECTED] wrote:
Date: Sun, 2 Mar 2008 09:24:52 -0800
From: Dylan Beaudette <[EMAIL PROTECTED]>
Subject: Re: [GRASS-dev] 2D to 3D points
To: [email protected]
Cc: Benjamin Ducke <[EMAIL PROTECTED]>
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset="iso-8859-1"
On Saturday 01 March 2008 10:20:45 pm Hamish wrote:
Benjamin Ducke wrote:
That should work but it may not exactly be easy to locate for a
novice user.
How about a little wrapper script for v.transform that simplifies
this action?
I am increasingly concerned about the number of, sometimes basic,
geoprocessing functions that are present in GRASS but "hidden"
in complex module options. Of course people can always mail to
this list but in the first place it will create frustration for
them and possible turn them away.
So we make little wrapper scripts like v.dissolve and v.centroids.
That's much better than dealing with code duplication.
but that shouldn't wrap 3 module commands together with temporary
maps
etc to perform something as simple as the 2d+attr column -> 3d points
conversion. If as Maciek suggests v.transform could do the job then
it's not so bad. The v.transform name even sounds right for the job.
Hamish
I agree that we should avoid code duplication at any cost, and
v.transform
does the job. However, doesn't it make more sense to put that code
(for
points) into v.extrude ? Or, is v.extrude primarily for areas by
design?
Dylan
IMHO, v.type is a much better place to put this. v.type is already
designed to transform vector objects from one type of vector object
to another. Changing a vector object from a 2D point to a 3D point
seems to fit this concept well. (And while we're at it, v.type should
be changed to work like v.type.sh).
v.transform is really a georectifying module for vector objects. It's
a conceptual stretch to include transforming 2D to 3D points there--
though it does work.
v.extrude is designed to extrude a 'flat' object into a 3-dimensional
space--primarily polygon to polyhedron. Following this concept, it
should extrude a line into a 'wall' and a point into a 1-dimensional
'pole'. It is not aimed at repositioning dimensionless points in 3D
space.
Michael
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