[GRASS-dev] bug in v.surf.bspline?

Michael Barton michael.barton at asu.edu
Wed Oct 24 02:59:26 EDT 2007


I was able to test your fix of v.surf.bspline to use a vector attribute
table value for interpolation.

AFAICT, it works perfectly. As before, I did an interpolation of an
attribute value (using bicubic) that is exactly the same as the z value.
Then I did a difference map. They are identical, creating a 0 value
difference map.

Thanks again for the very quick response to my bug report.


On 10/22/07 11:55 AM, "Roberto Antolín" <roberto at geomatica.como.polimi.it>

> On Mon, 22 Oct 2007, Michael Barton wrote:
>> Shouldn't the results be identical if the values used for interpolation are
>> identical, regardless of whether they reside in the z-coordinate or an
>> attribute?
> Yes, the results must be the same, but only if there isn't another bug.
> I'm completly sure about z-coord interpolation cos I use it daily.
> However, since I don't use it with attributes values I don't know if it
> works properly well. It should do so because the interpolation functions
> are the same in both cases.
> Obviously it works well to me, otherwise, I wouldn't have done the update
> to cvs. However, till you don't do this last test I can't be sure. That
> was what I wanted to mean, some caution. Sorry if I created some doubts.
> It was no my intention.
>> I'll test as soon as I have a chance and let you know.
> Thank you very much, Michael. You are helping a lot for the module
> bugfixing.
> Roberto.

Michael Barton, Professor of Anthropology
Director of Graduate Studies
School of Human Evolution & Social Change
Center for Social Dynamics & Complexity
Arizona State University

phone: 480-965-6213
fax: 480-965-7671
www: http://www.public.asu.edu/~cmbarton

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