the sample profiles using their Zeiss C100 Planicomp analyti- 
cal stereoplotter. 
b) North West Survey Group, Edmonton, Alberta for grid sampling 
using their Wild ACI analytical stereoplotter and plotting 
contour lines using their Wild CIP and TA2 table. 
c) Stewart, Weir Land Data Inc.,Edmonton, Alberta for testing the 
accuracy of contour plots using their Wild BCl analytical 
stereoplotter. 
REFERENCES 
/1/ Balce, A.E. 1986. "Determination of Optimum Sampling Interval in 
Grid Digital Elevation Models (DEM) Data Acquisition", Annual 
ACSM/ASPRS Convention, March 16-21, 1986, Washington, DC, USA. 
/2/ Toomey, M.A.G. (ed.) 1984. Digital Elevation Model Workshop 
Proceedings, ABSM, October 10-12, 1984, Edmonton, Alberta, Canada. 
/3/ Toomey, M.A.G. 1986. "Digital Elevation Models in Alberta", 
Annual ACSM/ASPRS Convention, March 16-21, 1986, Washington, DC, USA. 
Table 1 Long Profiles 
| SPECTRA LOGKV LINEAR RF Mean| R.F. 
  
Prof|Int|Diff| Z |Int|Diff 
> 
Int|Diff| % Int | Diff % (m)| (%) 
  
(1) |C2)|C3) |C4)|C5)| (901 02|()] (9) (10)| (11)| (12) | (13) | (14) | (15) 
9 5| -2 1-29] .8 1| 14] 10] 31 43 6 | -1 |-14 7 110.9 
7 10} —2 [-17| 11} -1| -s 15} 31! 25 |} 10,4 2 = 17 12 ] 9.3 
152 | 1381 31 25} 101 -21-17] 111, 711. 78.1..12 0 0.4 12.1 2.3 
154 | 30] 10 |] s0f 18] -21-10| 20] 9 O | 11 |} -9 |-45 | 20 } 1.6 
7 0.9 
6 0.7 
  
  
155 1.64] 91 16] 63 8| 14| 62 131 31 1-24 1-44 1 55 
153 1.771 29 4| 66| -8|-11|110| 3 49 | 41 |-33 |-45 | 74 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
RMS 28 13 29 33 
Mean 8 -3 20 -28 
Notes: 
(1) Profile identifier 
(2), (5), (8), (11) Computed sampling intervals (m) 
(14) Mean sampling interval 
(3), (6), (9), (12) Differences from the mean 
(4), (7), (10), (13) Percent differences with respect to mean 
(15) Roughness factor 
- 47 -