[GRASSLIST:467] Re: dem rescale

[Martin Wegmann]

hello, 

> Are you working in a UTM Projection?

Yes UTM WGS84

> Does r.describe -r reveal a range of 1-65000 or 1-255?

r.desrcibe shows a range of 1-65280

> What color table are you using on the import file? If it's grey.eq, all
> values above 255 will appear white. Try changing the color table to
> grey/gyr/ryg and try again. Should work.

I changed with r.colors the color table to ryg but still only a minority of 
the pixels are displayed (the same as before) 
d.profile didn't show as well the other values
d.what.rast is still prompting the values for the "white" areas (all above 
255).and nviz is visualizing the values above 255 still as plateau. 

further ideas what might be wrong?

thanks Martin


>
> Sujoy
>
> -----Original Message-----
> From: owner-GRASSLIST at baylor.edu [mailto:owner-GRASSLIST at baylor.edu] On
> Behalf Of Martin Wegmann
> Sent: Friday, June 20, 2003 11:07 PM
> To: GRASSLIST(engl)
> Subject: [GRASSLIST:446] dem rescale
>
> Hello,
>
> is there a way to display all values of a dem? the original range was
> 1-65000
> (export from ERDAS), but only values up to 255 are displayed in the
> monitor
> even though d.what.rast is prompting values for the white areas. Nviz is
>
> showing these values above 255 as plateau.
> When I rescaled the dem to values between 1-255 the whole image can be
> seen
> but in a pretty coarse resolution in nviz.
> When I visualize it in ERDAS I get a better 3D image and I can recognize
>
> valleys.
>
> any idea how to display all values?
>
> thanks in advance, cheers Martin