[gdal-dev] 3D maps

[Malm Paul]

Thanks, interesting...

1) Has GRASS functions to insert points in the road where it intersects
a triangle in another layer.
I.e the road must be drawn ontop of the triangulated surface where the
surface triangles are not regular, due to open field- forrest- city area
borders? 

2) Do you know of an turtorial documentation of GRASS where I can learn
more about it?

Kind regards,

Paul Malm

-----Original Message-----
From: Jeshua Lacock [mailto:jeshua at OpenOSX.com] 
Sent: den 27 november 2007 13:02
To: Malm Paul; gdal-dev at lists.osgeo.org
Subject: Re: [gdal-dev] 3D maps



On Nov 27, 2007, at 12:05 AM, Malm Paul wrote:

> I have a geometry set of triangles (e.g land area), including 
> elevations.
> To be able to view e.g roads ontop those triangles I must insert 
> points in the road polylines with the correct elevation in each 
> intersection (roadline - triangle border). Att the same time I would 
> like to insert the correct elevation of the original points of the 
> road-polyline. is there a command that could do this for me?

Hello

I am not sure about GDAL, however, GRASS GIS certainly has the
functionality.

In fact, with a single command you can covert 2D vectors to 3D:

	v.drape -[ B | C ] input=2D_vector output=3D_vector
rast=elevation


Cheers,

Jeshua Lacock, Owner
<http://OpenOSX.com>
phone: 877.240.1364