128 
Table 1. Comparison of results of operator-assisted estimates of soil disturbance with a ground survey for 
CP#140 Unit #29 and #32. 
Survey 
Unit 
Landing 
Roads 
Skidroads 
Disturbance 
Total Area 
Method 
Area 
UNIT #29 
Field 
ha 
0.223 
0.500 
0.944 
1.667 
10.225 
Survey 
% 
2.18 
4.89 
9.23 
16.30 
100.00 
pixel 
2 136. 
3 537. 
7 743. 
13 416. 
82 116. 
Computer 
ha 
0.266 
0.440 
0.964 
1.670 
10.225* 
Survey 
% 
2.60 
4.31 
9.43 
16.34 
100.00 
UNIT #32 
Field 
ha 
0.245 
0.550 
0.105 
0.900 
6.833 
Survey 
% 
3.58 
8.05 
1.54 
13.17 
100.00 
Computer 
pixel 
2 194. 
5 413. 
3 891. 
11 498. 
77 393. 
Survey 
ha 
0.194 
0.478 
0.343 
1.015 
6.833* 
% 
2.83 
6.99 
5.03 
14.85 
100.00 
* Based on number of ha from ground survey.