OUCC Proceedings 9 (1979)

A Computer goes Surveying

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VARIABLE LISTING

Line Variable Comments
20 X(I), Y(I), Z(I) The incremental increase in x, y, and z between two survey stations
G(I) Survey station number
30 V(I, J) The J'th co-ordinate of the uncorrected end of a loop going round path I.e.g.
V(1,1) = x co-ord. of sta. at end of 1st path
V(2,1) = x co-ord. of sta. at end of 2nd path
V(1,2) = y co-ord. of sta. at end of 1st path etc.
30 M(I), W(I), O(I) The actual x, y, z, co-ordinates respectively of the I'th survey station.
i.e. M(I) = S X(J), W(I) = S Y(J) etc.
40 A(I), B(I), C(I) The distance, bearing and inclination readings respectively, between two stations which is needed to enable data corrections before calculation.
40 U(I) A flag; = 1 for forward bearings, = 0 for backward bearings, enabling the computer to tell which it is.
50 D(I) The total leg length along 1st path D(I) = S A(I)
S(I) Total plan length along 1st path S(I) = S A(I)*Cos(C(I))
PR(I) Extended elevation co-ord. of station I
PJ(I) The plan length, from the entrance station along the designated vertical plane of the I'th survey station. Used in projected elevations.
60 PI = p /180, a conversion factor from degrees to rads.
70 A4 The name of the cave.
80 N The total number of stations in the part of the cave which is being calculated.
90 J, F Indices; J is the first and F the last values of I for the various loops.
120 L6 A flag; = 1 for the 1st path round a loop, = 2 for the 2nd path.
Needed to ensure that plan and leg lengths for each path remain separate.
140 J3 The number of copies of the data to be printed.
170 G4 = Y if there are loops to be closed or N if there are none.
190 A1 The number of the first station in the 1st path of loop.
230 I1 I value of the first station in the 1st path of loop.
A2, I2 As for A1 or I1 but for last station loop.
310 N2 The number of stations in the 2nd path round a loop.
390 EX The difference in the two x co-ordinates of the last station in a loop as obtained by surveying round the paths in the loop.
EY, EZ Same as for EX but y and z differences.
420 ET Total distance between the two sets of co-ordinates of the last station in a loop.
430 N3 Total number of legs round the complete loop (= 7 in diagram 2).
480 H A counter to add the appropriate correction to the station co-ordinates.
H1 Same as H, but for the stations on the 2nd path.
640 H4 A flag to bypass the co-ordinate summing routine
710 Y1, Y2, Y3 x, y, z, differences between adjacent stations on 1st path.
Used in percentage error calculation.
720 D(3) Plan length along 1st path round loop
740 D(4) Plan length round complete loop.
750 D(5) Percentage error of misclosure.
790 P1 Required number of vertical projections.
820 PA Required angle of projection.
850 K3, K4 First and last I values for use in projection calculation routine.
1020-1260   System for storing data on cassette. As this differs from one machine to another, explanation is of limited value.
1280 R, S Survey station numbers. Bearings are taken from station R to station S.

....and a gold medal to Joan Arthur for re-typing all of this (and the rest of Proc 9).