[vtkusers] how to clip and cut DEM data?

[Karthik Krishnan]

On 4/25/07, ye.yuanzhi <yeyuzh at 163.com> wrote:
>
>  dear Karthik Krishnan:
>         thanks very much to give directions. Now i have another question .
> I want to get the bound of the DEM ,so i used vtkDataSet::GetBounds();but
> the return vale(zmin = = zmax).I don't know why to that?  I want get the
> range of  the XYZ three orientations  of  the DEM. How to get it? Thanks at
> first.
>


DEM data is 2D image data. So GetBounds will return zmin=zmax. The scalar
values of the image represent the height field. So use the GetScalarRange
method to get the max-min values of the elevation :

  demReader->GetOutput()->GetScalarRange()

--
karthik
PS: Please keep mails to the list.


======== 2007-04-25 15:57:00  ========
>
>
> DEM data is just 2D image data with the scalar values representing the
> height field. So you do need to transform it to polygonal data to be able to
> render it and then cut it.
>
> See  IO/Testing/Tcl/dem.tcl for an example of how to transform it to a
> polydata.
>
> --
> karthik
>
> On 4/25/07,  <yeyuzh at 163.com> wrote:
> >
> > hello,everyone:
> >         vtk can cut vtkPolyData type data,I want to cut the DEM data!
> > who do you know the  way to do it.  need I to transform   the imagedata to
> > vtkpolydata? how to transform? thanks!
> >
> >
> >
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>
>  = = = = = = = = = = = = = = = = = = = = = =
>
>  ye.yuanzhi
>  yeyuzh at 163.com
>  2007-04-26
>
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