[GRASSLIST:830] UNSOLVABLE problem in GRASS!!?

[Ramin Safa]

Hi,Massimiliano
Hi,All
Regarding your reply:
for items 1 and 2 ok.,but for item3:
we can not mask for raster map slope another map,we can
only creat a raster map that work with special slope(for
example slope Less than 60%),but we can not creat it,as a
work inside of watershed or outside of watershed because
the watershed boundry is in diffrent map.
any way,i,ve done these:

1.reclass slope map(to simpliphy)...
2.raster to vector by r.poly
3.v.patch watershed boundry ,slope map
until here every thing is ok,and i have area for slope
clases but in the squer.. but NOT ..in the watershed map(by
r.report)
4.v.cutter for omitting out of watershed area(vector map is
ok)but:
5.v.report or d.what vect....there is no any data in area

So,I thought about this problem and did anything should be
do,this problem is related to software or program,it can
not do this.
If somebody knows ,please tell me.
Regard
Ramin





4.
--- Massimiliano Cannata
<massimiliano.cannata at ist.supsi.ch> wrote:
> I'm not sure to have understand all, but:
> 
> 1- a raster map is a "box" rappresentation, in fact in a
> raster
> ascii you have an header that says the coordinate
> extention of your
> "box" (or better to say region). So you cannot have any
> border on
> it.
> 
> 2- when you intepolate you will always have some border
> problem,
> that's because on your border (note, the border of your
> interpolated set of line or point) you have only one side
> value,
> while on the other you have null value so you begin to
> invent....
> it's usually done to keep a larger area and then take off
> a buffer.
> 
> 3- if you want to have a raster with your value only
> inside the
> watershed consider to interpolate, calculate slope and
> after assign
> a null value outside you interest region. I f you can
> create a
> raster that works as a mask (for example with value=1
> inside your
> watershed and value=0 outside) you can easly do it with
> r.mapcalc.
> 
> 
> Ramin Safa wrote:
> 
> > Hi
> > Regarding folowing email
> > My area is a watershed but:
> > I don want to do r.watershed
> > I need to use only my area(watershed ) not a
> squer(whole
> > screen)and i need slope,,...
> > please if anybody knows ,help me
> > sincerely
> > Ramin
> >
> > Note: forwarded message attached.
> >
> > =====
> >
> > Ramin Safamanesh
> > Department of  Environment Science , UPM
> > Email :  rsafamanesh at hotmail.com Tel  :  0060122399448
> >
> > __________________________________
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> >
> >   --------------------------------------------------
> >
> > Subject: [GRASSLIST:781] slope map
> > Date: Mon, 21 Jul 2003 18:53:15 -0700 (PDT)
> > From: Ramin Safa <raminsafa at yahoo.com>
> > To: mlennert at club.worldonline.be, grasslist at baylor.edu
> >
> > hi
> > *Regarding slope map(raster),befor v.to.rast my map had
> a
> >   border but after v.to.rast  ..the border is
> disapeared
> > and **because of this when i run : r.slop.aspect
> ....slope
> > map
> >    and aspect map and .. will be wrong, am i right or
> no?
> > ***if this is true how i save the border and if it is
> not
> >
> >    true how i solve my problem?
> > ****and also if i run v.surf.rst or r.surf contour i
> have
> >    same problem :out of the borderplace(but dont have
> >    border) the colors is confused.
> > actually i think ,in vector map the border is a
> continuse
> >    of end of contours line(related to digitizing)..
> > Regards
> > Ramin
> > ---
> >  Moritz Lennert <mlennert at club.worldonline.be> wrote:
> > > Ramin Safa said:
> > > > hi Moritz
> > > > thanks ,i did v.transfom.
> > >
> > > And did it work correctly ? Have you checked with
> > > d.what.vect to see the
> > > resulting attribute values ?
> > >
> > > > but now please go to problem
> > > no:737<grasslist>r.slop.aspect
> > >
> > > I've seen your mail, but can't answer your question
> > > without more
> > > information about your data. On what file did you run
> > > r.slope.aspect ?
> > >
> > > > the answers is not real and not correct.
> > >
> > > Then probably the data is not correct.
> > >
> > > > r. report also is no correct.
> > >
> > > idem
> > >
> > > > i dont know why.
> > >
> > > One reason might be that your contours were actually
> > > digitized as areas,
> > > not as lines. You might want to try by transforming
> all
> > > the areas to lines
> > > (you could use v.area2line). After the transformation
> you
> > > would have to go
> > > into v.digit and lable the lines, but seen that you
> don't
> > > have too many of
> > > them, this shouldn't be too much work. Then you could
> use
> > > v.surf.rst or
> > > something like that.
> > >
> > > Moritz
> >
> > __________________________________
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> 
> --
> -------------
> Ing.  Massimiliano Cannata
> Istituto di Scienze della Terra - SUPSI
> C.P. 72 - CH-6952 Canobbio (Ticino, Switzerland)
> Tel +41 91 /935 12 25 - Fax +41 91 /935 12 09
> eMail: massimiliano.cannata at ist.supsi.ch
> Internet: http://www.ist.supsi.ch
> 


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