Mike Jenne a écrit :
Given a set of points (specifically, a hurricane track) I am trying to
select one point in sequence, then the next point in sequence, extract
the angle and distance between the two, and then create intermediate
points using the Offset function, the angle, and a fractional portion of
the distance.
I’m using
ANGL =
Asin(Distance(F_XX2,F_YY2,F_XX2,F_YY1,"mi")/Distance(F_XX1,F_YY1,F_XX2,F_YY2,"mi"))*
RAD_2_DEG
to measure the angle, where F_ANGL is the angle, F_XX2 is the CentroidX
of the second point, F_YY2 is the CentroidY of the second point, F_XX1
is the CentroidX of the first point, and F_YY1 is the CentroidY of the
first point. All variables (in this instance) are float values,
If you need only the angle to create intermediate points, you can make your
code much simpler using a proportinal divide beetween point 1 and 2 :
If you want N-1 intermediate point run for i = 1 to N-1 :
Xi = F_XX1 + (F_XX2 - F_XX1) * i/N
Yi = F_YY1 + (F_YY2 _ F_YY1) * i/N
--
Michel Wurtz
MAP/SG/SM/SDSI/CERIT/DIG
B.P. 12668 - 31326 Castanet-Tolosan Cedex
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