APPENDIX I. 
DETAILED INFORMATION ON OPERATING CONDITIONS AND DATA 
Latitude 9945'N - 11°15'N 
Height range 130' (within mapping area) 
880! (within area covered by APR) 
Terrain Flat or gently undulating, occasional steeper 
Slopes away from river. 
Vegetation 3395 bare 
30% scrub covered 
35% very light forest 
2% medium or dense forest 
Cameras Wild 6" Aviogon RC5 and RC8 
Flying heights Runs 1 - 17 (mapping cover) 20,500! 
(photographic runs) Tie run N1 20,500! 
Tie run 1 9, 000! 
Tie runs 2 and 3 9, 500! 
Trig identification runs -usually 7,500! 
* (Existing cover notflown ) Control strips 10 - 25 5, 000! 
Epic OS ue jon ! Control strips 26 - 30 3, 300! 
(controlling APR lines. ) *Control strips prefixed "A" 3, 000! 
*Control strips at Yelwa 3, 000! 
Datum point runs at various heights 
Flying heights Runs 2/3 and 3/4 7, 800! 
(APR runs) Runs 4/5 - 7/8 8, 500! 
Runs 8/9 and 9/10 10, 000! 
Runs PR15,15/16, 16/17 6,400! 
Runs PRN3 6, 400! 
Operating dates (APR runs) 8/10/59 - 27/10/59 
Operating times (APR runs) 0800 - 1200 GMT (increased turbulence 
and formation of cumulus in afternoons) 
APR lines usedfor control 2/3 - 9/10 
15/16 and 16/17 
PR15, PRN3 
APR tape speed 11" per minute, constant 
Mileage of APR runs used 
for control c.1700 miles 
16