a x 
7 
Schedule 5. Facts about the mapping out of forested land. 
| ji Map18090 | 
| LA|.B l.c | n | 
| Counted and m~asured variables [e ss | | 
* x | | Field | Photogr. | Photogr. | Photogr. | 
| | meth. | 1:18 000 | 1:13 000 | 1:8 000 
| | | | 
1. Number of sections | 369 | 314 | 320 | 985 | 
| percent of A onl a ue | — | 85 I 87 [04 | 
[Der hear N 0585| 045 | 046 | 05 | 
12. Number of intersecting section lines | | | | 
| lakes, water-courses, roads ...... 66 | 58 52 1| 51 
per cent of Ao... 21. s v EL ( | 80 | 19 | UT 
| per 100 m test lmes ............ 094 | 090 | 0.19 [ 0.19 
| other sections .....…....….. .…. 249 188 | 179 201 
per cent of À ........…...…. % 76 | 7 | 81 
| per 100 m test lines ...........… 092] 069 | 066 | 074 
| all sections, ++... 85] o4 | 23 252 
per cent of À .... he % Ti 4d a | 80 
| per cent of Ar sn 1.16 0.89 | 0.85 | 0.98 
3. Number of intersecting and identi- 
fiable section lines | 
r x | lakes, water-courses, roads ...... 18 M | 57 
\ p»ercentof 4... edere | 91 3.1 3 
in { other sections ...... eus aus — 113 114 125 
| per cent of A ............ Lu % 60 64 62 
Y * f all sections ... 5. 5 oe ro 161 | 151 | 162 
\ per cent of AL ", 67 | 65 | 64 
4. Length of section lines | 
kilometre in the field ............ 122 9% | 103 117 
meter per hectare .…......... . 130 101 113 151 
per cent of A................…..… % 77 87 100 
5. The standard deviation of differences 
in position between intersecting and 
identifiable section lines 
lakes, water-courses and roads 
mm on. map... c ess — 0.82 0.55 0.68 
other sections mm on map ... — 1.36 1.28 1.25 
* * all sections — mm. on map ...... — .22 1.14 1.15 
as variable for this purpose. A better result than from the investiga- 
tion before us surely will be gained, when classifying the section lines 
according to the different types of soil and vegetation etc. 
The standard deviation of difference in position between intersec- 
ting and identifiable section lines seems to be about + 0.7 mm on map 
- A 
i +