and amended as required, 
INPUT FORMAT - note Figure 9 - the data block 
End of Sub | Accuracy 
. Block | Code { Code | Code | X | Y L.Z 
  
$v y C | SG | AC | X1 Y127 
(1) (3) (4) (1) (5) (5) - (5) 
Code(C) - all topographic features of the same nature have the same 
code. e.g. rivers, lakes, individual trees, rectangular 
buildings, irregular shaped buildings with linear sides, 
silos, contours, etc, 
Subcode (SC) - the subcode records changes within each code e. g. 
building #0001, building #2; segments of contour #0001, 
segments of contour 0002, 0003, etc. 
Accuracy Code (AC) - this code ties back into the data base concept 
for Figure 2. "This digit is used to depict the accuracy 
of that particular point relative to the Hierarchy of Data 
Bases - Figure 2. 
All topographic data is entered in above data block, format, In entering 
topographic data, the stereo compiler has no option but to enter all 
of this data each time he depresses the foot pedal. 
The action of depressing the foot pedal also drops the pencil onto the 
pencil manuscript directly in front of the stereo compiler on the 
internal tracing table of the planimat, Thus, the stereo compiler