On 3/14/21 11:07 AM, Enrico Gabrielli bonushenricus wrote:
Hi
How are you?
After solving thanks to Stefan and his r.slope.direction how to
calculate the slope along the keyline, now I have to solve how to
create parallels to the keyline. Nothing easier: see parallel! But I
have to create many. In the graphical modeler I can't learn how to use
the loop. Damn if I'm ignorant. But maybe v.mapcalc would also be very
handy. But it doesn't work for me. After installing ply it doesn't work
anyway.
Can you add some further information:
What is your operating system?
What version of GRASS?
When you say "I have to create many", do you mean many parallel lines at
different distances?
Are you working with projected data? (I missed the previous thread on
r.slope.direction, sorry if this has been mentioned before)
What scripting language do you prefer? python? bash shell script?
If python, what version is installed? (note that GRASS 7.8 has switched
to python 3)
What is "keyline"? (i.e. please show the output from `v.info keyline`
Traceback (most recent call last):
File "/usr/lib/grass76/scripts/v.mapcalc", line 429, in
sys.exit(main())
File "/usr/lib/grass76/scripts/v.mapcalc", line 415, in
main
p.parse(expression)
File "/usr/lib/grass76/scripts/v.mapcalc", line 191, in
parse
self.parser.parse(expression)
File "/usr/lib/python2.7/dist-packages/ply/yacc.py", line
333, in parse
return self.parseopt_notrack(input, lexer, debug,
tracking, tokenfunc)
File "/usr/lib/python2.7/dist-packages/ply/yacc.py", line
1063, in parseopt_notrack
lookahead = get_token() # Get the next token
File "/usr/lib/python2.7/dist-packages/ply/lex.py", line
393, in token
newtok = self.lexerrorf(tok)
File "/usr/lib/grass76/scripts/v.mapcalc", line 146, in
t_error
(t.lineno, t.value))
SyntaxError: syntax error on line 1 near
''buff_l(keyline@PERMANENT,5)''
I used all possible quotes in the expression, but the result is always
the same
I don't want to use qgis (where there would be offset) because
r.slope.direction is in grass and it is very convenient, and also all
the rasters I use have them in grass. I would like to learn how to do
everything in GRASS.
Well, who knows if I'll succeed. As soon as I have some pennies I pay a
friend of mine who is a python developer: maybe it's better.
Thanks
--
Micha Silver
Ben Gurion Univ.
Sde Boker, Remote Sensing Lab
cell: +972-523-665918
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