Dear Researchers,

thanks for attention and patience

I generated with "spsample" a x number of random points and my next step is
change the the point to line (ex: 30-40 m) to have LIS (*Line Intersect
Sampling SEE REFERENCE **Van Wagner CE (1968). *The line intersect method in
forest fuel sampling. Forest Science 14: 20-26.*)* . As the fig,. of the
link

http://www.sisef.it/forest@/papers/no15/Scarfo_536@image004.jpg

eventually I am trying to change the point (the centre of the line) with a
line and save all in shapefile, but i two technical problems and I wish same
link to study or suggestion:

1. How I can change a point in a line with 30 m of length, using the point
as the centre of line?
2. Is It possible to change the angle of line respect the north? eventually
random angle

too many question and I am so sorry, but  it's the first time I am working
in this new problem.

gianni

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