[GRASS-user] representing missing values (attributes) in vector point data

[Joel Pitt]

On 5/19/06, Suprit Kumar <suprit at nio.org> wrote:
> Dear GRASS users
>
> Excuse me as I am asking the same question again. May be last time  I didn't
> ask it clearly or I am terribly out of touch :-)
>
> Is it possible to represent missing values in a grass vector point map?
>  So that while doing calculation (like interpolation from vector to raster)
> the point having missing value is skipped.

I think the best way would be to use a special column value or a whole
column for whether vector points are to be counted as missing or not.

Then when you want to do a calculation on non-missing points, extract
them with v.extract

-Joel

-- 
"Wish not to seem, but to be, the best."
                -- Aeschylus