[GRASSLIST:7733] Re: cells and slope maps-solved

[ivan marchesini]

It was my fault....
sorry to all!!!
all the cells pertaining to the boundary of the investigated area
disappear when I execute r.slope.aspect (due to the way r.slope.aspect
work)
I didn't discover it before because like a dummy I didn't remember of
use the -o option in d.rast...
I apologize with all!!!!!!!
ivan


Il giorno mer, 27-07-2005 alle 16:18 +0200, Massimiliano Cannata ha
scritto:
> I guess that the nuber of cell should be the same in the two raster, 
> maybe the number on non null cell could be different....
> have you used r.stats to find out the cell number?
> 
> Maxi
> 
> ivan marchesini wrote:
> 
> >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