Source of At the scale of 
height orig. photos 
Instrument data (1:10 000) 
  
AZ may (mm) n; (mm) 
  
Galileo Orthophoto drop lines 0.28 D. 
Simplex 
Gestalt Photo Mapper II | spot elevations 39 
Kelsh K320 (10 mm slit) | digital record 
Kelsh K320 (5 mm slit) digital record 
Ortho SFOM 9300 | drop lines 
Wild PPO-8 | digital record 
Zeiss GZ-1 storage plate 
  
  
  
  
  
  
Zeiss-Jena Orograph drop lines .18 
  
TABLE VI. Standard errors in height data 
Evaluation of Contour Lines 
  
" The following contour sheets were obtained: 
Gestalt Photo Mapper II: Contours at the scale of 1:10 000 plotted 
on-line from automatic correlation data (Fig. 4). 
Kelsh K 320: Contours produced by the Calcomp automatic contouring program 
ona Calcomp plotterat the U.S. Forest Service. Three con- 
tour sheets at the scale of 1:2 500 were produced. One of 
these was based on recorded profile heights at intervals of 
AX =5 mm,AY =4.8mm (14 000 points) using unedited profile 
data (Fig. 5). Another was based on profile heights at 
intervals of AX = 10 mm, AY = 4.8 mm (7 000 points) using 
unedited profile data, and the third was based on profile 
heights at intervals of 4X = 10mm, AY = 9.6mm (3 500 points) 
after a data smoothing and rejection program was used. 
Wild PPO-8: Contours produced by the Stuttgart Contour Program. The 
computation of contours was based on profile heights at inter- 
vals of AX = 5 mm, AY = 5 mm (average) and, in addition,