155
These procedures are written in algol '60 with modifications
according to the alcok convention.
Description of the formal parameters of g 16 and £17
integer i
The pointnumber of the initial point of the
geodesic, from i to ji is an odd number.
integer j
The pointnumber of the terminal point of the
geodesic, from i to jj is an odd number.
array bgz [1 :hp+i]
Array with geographical coordinates of the
points of the net. The points are odd numbered
beginning with 1. hp is the highest point-
number.
In bgz[i] stands cpi and in bgz[i+i] stands A
array saa [113]
saa [1] the length of the geodesic from
point i to point j.
saa [2] the azimuth in point i of the geode
sic from point i to point j.
saa [3] the azimuth in point j of the
geodesic from point i to point j.
array ellips [1:2]
Parameters a and b of the ellipsoid concerned.
Only if num 0 these values must be given
in the procedure. For the other cases the
values of a and b are known to the procedure.
integer num
This number indicates the ellipsoid that has
to be used.
num =- 0 The parameters a and b of the
ellipsoid are given by the program
which activites the procedure,
num 1 The ellipsoid of Hayford.
num 2 The ellipsoid of Bessel.
num 3 The ellipsoid of Everest 1830.
num 4 The ellipsoid of Clarke 1866.
num 5 The ellipsoid of Krassowsky.
num 6 The ellipsoid of Bomford-Fisher
1961.
real eps
Accuracy, in sexagesimal seconds, of the
latitude of point j.
It is assumed that the accuracy of the longi
tude of point j is eps/cos(bgz[j]).
The azimuth is computed with an accuracy
of eps*ellips[i]/saa[i].
procedure nu8
Procedure for the numerical solution of the
differential equations by the method of
Runge-Kutta.
