Teil C - Annex 
53 
: 
1 
H 
; 
3 Avifauna (Resting and migratory birds) 
3.1 Resting birds 
See table 3.1.1: Survey of foraging, moulting and resting birds. 
Heinemann formula for estimating the transect width 
Application 
1. The ruler is held vertically. The arm is extended forwards. The ruler should be approxi 
mately at eye level. 
2. The distance between ruler and the observer’s eye is measured. 
3. The observer’s eye level above deck (standing) is measured. 
4. The eye level height is added to the height of the deck above water (= eye level above 
water surface level). 
5. The Heinemann formula is applied by using the values of the measured arm length, the eye 
level above water surface level and the transect band limits that need to be calculated 
(e. g. 50 m). 
6. The calculation result is marked on the ruler (see drawing). 
7. The zero line of the ruler is marked as horizon line. 
8. For the improved estimate of larger distances (e. g. to ships or wind turbines) an additional 
distance of 1,000 m may be marked on the ruler. 
9. For estimating transect band widths, the ruler with the marked horizon line is aligned with 
the true horizon line (standing, ruler held with arm extended forwards) and the transect 
band allocation is made. 
loaom 
□ 
J 
A 
■> horizont line Sections on the ruler = 
300 m 
A x B (3838 x - C) 
B 1 + 3838 x S as x C X 
2Û0 m 
100 m 
A = arm length 
B = eye level height above water 
50 m 
C = transect band limit 
100 
surface level