Markus the field description for s.vol.rst in manual is confusing - field is not
z-field attribute because z is the third dimension
it should be w because the function is w=f(x,y,z) so the data would be
x,y,z,w and the multiplier is referred to as wmult later.
I also suggest to write for input file that the input is x|y|z|%w
(Jaro, Markus is that right? Was it updated to the new format? can it be
x|y|z|#n %w1 %w2 %w3,
if yes then x,y,z,w should be removed from the manual as it is confusing)
input
Name of the site file with input x,y,z,w
cellinp
Name of the surface cell file
field
Number of z-field attribute to use for calculation
default: 1
z_orig
Minimum z-value
Bill used in s.surf.rst manual the following text:
field=val
decimal attribute to use for elevation (1=first) options (1-100), default is 1.
so Markus if you could change to something like:
field
decimal attribute to use for value w (1=first) options (1-100), default is 1.
On another issue, npmin 100 is not enough if segmax is 50 for heterogeneous
data.
Because the computers are much faster now I suggest to hardcode
segmax as 40 and npmin as 300 for both s.surf.rst and s.vol.rst
and remove those two parameters to reduce their number in GRASS5.1.
I have never changed segmax since 1991 and I stoped experimenting
with npmin in about 1995 and use 300. It is a certain loss of flexibility
but whoever wants to play with those parameters can work with the source.
Let me know what fo you think about such change.
Helena
Panoot Suwanwiwattana wrote:
hi all,
I want to use s.vol.rst but i don't understand its module data format, my
idea should be (x|y|z @catagory %interpolation_value) but when i import
site data from postgres, it will be like (x|y @catagory) so
1. What is needed data format for s.vol.rst? like my idea?
2. I have to write some script to export data from postgres then import to
GRASS like ascii file?
3. How can i specify which column is for interpolate in s.vol.rst?
4. the option field value in s.vol.rst is refer to what column eg. field =
2 (what does it mean)?
Thanks.
Mr.Panoot Suwanwiwattana
Research Assistance
Geotechnical Engineering R&D Center.
Kasetsart University, Thailand.
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I suggest to change now.