[GRASSLIST:7719] Re: cells and slope maps

[ivan marchesini]

thanks for your answer Jachym,
do you mean all the cells in the border or only some cells???

I have created two maps having the value=1 using mapcalc:

map1=slope/slope
map2=dem/dem

and later I have tried to subtract the two maps:

map3=map2-map1

the result is a map where all the cells have 0 value (verified with
univar)
this is strange because I would expect that some cells have value=1

how can you explain this behaviour???
any suggestions???

Thank you very much
ivan








Il giorno mar, 26-07-2005 alle 11:57 +0200, Jachym Cepicky ha scritto:
> hallo,
> depending on algoritmus, it could be, that some cells around borders
> could be not calculated...
> 
> jachym
> 
> 
> On Tue, Jul 26, 2005 at 12:03:08PM +0200, ivan marchesini wrote:
> > Dear users,
> > I have a little problem...
> > I have tried to verify the number of the cells of a dem and of the slope
> > map derived from it using the r.slope.aspect module...
> > it seems that the number of cells in the slope map is a little smaller
> > than in the dem...
> > is it normal??
> > I have tried to verify where are the missing cells but I wasn't able to
> > find them!!!
> > can you help me???
> > thanks 
> > 
> > ivan
> > 
> > 
> > 
> > -- 
> > Ivan Marchesini
> > Department of Civil and Environmental Engineering
> > University of Perugia
> > Via G. Duranti 93/a 
> > 06125
> > Perugia (Italy)
> > e-mail: marchesini at unipg.it
> >         ivan.marchesini at gmail.com
> > tel: +39(0)755853760
> > fax: +39(0)755853756
> > 
> > 
> > 
> > 
> 
-- 
Ivan Marchesini
Department of Civil and Environmental Engineering
University of Perugia
Via G. Duranti 93/a 
06125
Perugia (Italy)
e-mail: marchesini at unipg.it
        ivan.marchesini at gmail.com
tel: +39(0)755853760
fax: +39(0)755853756