[GiDlist] How to establish a 3D terrain model

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青梅煮酒

[GiDlist] How to establish a 3D terrain model

Postby 青梅煮酒 » Sun Jul 21, 2013 3:47 am

Hello


I'd like to know how to set up a 3D model with topography, I already have the terrain elevation data, such as .DEM or .XYZ data. How can GID import them and about the interpolation work. I find it is hard to make a satisfied .geo model.
I am very appreciated to hear from you and thank you for your advice!


best wishes
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escolano
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[GiDlist] How to establish a 3D terrain model

Postby escolano » Tue Jul 23, 2013 9:28 pm

There are different possibilities, depending on the kind of available data,

Typical terrain cases are:

1- Unstructured cloud of points, e.g. a text data with x,y,z
coordinates

2- Level curves, e.g. dxf format with some kind curves of z=constant

3- A collection of unstructured triangles or other polygons, in formats
like dxf, stl, shapefile …

4- A structured grid of points z(x,y), e.g. Arc/Gis data or several
raster formats like geotiff

...



If you are in the case 4) then you can try for example to import them with
Files-Import-GDAL… , the open file dialog offer some extra options to
create elements or geometry surfaces, and subsample the data if the grid is
too dense.



If you are in the case 1) you can try Files-Import-XYZ points or XYZ nodes

and then do you have an interesting extra option to connect the points
triangulating them in XY projection, to create automatically surfaces



Other possibility is to import only the points, and create a single NURBS
surface that approximate the selected points with Geometry-Create-NURBS
surface-By points





Enrique Escolano





De: gidlist-bounces at listas.cimne.upc.edu
[mailto:gidlist-bounces at listas.cimne.upc.edu] En nombre de ????
Enviado el: domingo, 21 de julio de 2013 4:47
Para: GiDlist
Asunto: [GiDlist] How to establish a 3D terrain model



Hello



I'd like to know how to set up a 3D model with topography, I already
have the terrain elevation data, such as .DEM or .XYZ data. How can GID
import them and about the interpolation work. I find it is hard to make a
satisfied .geo model.

I am very appreciated to hear from you and thank you for your
advice!



best wishes

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