485 
Boundary 
Boundary 
Road 
toad 
site 
;entre - ( City ) 
) 60Kms 
Line 
Figure 2- Monthly temperature ana 
raintall data of Bagamoyo area 1978 ,1981 & 1984 
moyo 
irial photo- 
ire a Vi'as 
le on ove- 
L n 1966. 
Lte the fact 
:>il survey 
iat diffe- 
; photogra- 
,md on the 
se and ve- 
ince 1966 
taken). 
v as quite 
Lmatt photo- 
In total 
nple ting 
;s were 
jrial-photo- 
t of scale 
1H00,000 was used as base map for establi 
shing landscape boundaries. Also a contour 
map was jointly used to delimit the lands 
capes. 
2.2. Reconnaissance field survey 
A one day reconnaissance survey was condu 
cted to the farm area inorder to i aniilia- 
lize with the landscapes and thus access 
the soils occuring in different parts of 
the farm. During the survey the following 
factors were observed. 
1. The area was found to be in accessi 
ble due to tall grass vegetation (elephant 
grass). These occupied the whole flood 
plain area. On the coastal plain, woodland 
with bushes and thorny tall trees were 
the main vegetation. The floodplain area 
also had some abandened water logged mars 
hes. 
2. The vegetation being tall thorny 
trees and thick bushes, intensive ground 
clearing was necessary to enable the crew' 
to move freely through the farm. 
3. All parts of the project area were 
inhabited by wild animals and reptiles 
thus an experienced game scout was needed 
to safeguard the team during the exercise 0 
2.3. Aerialphoto Interpretation 
Physiographic analyses method (FA0, Goosen 
D.I967) was used in mapping the units. 
Photo elements which were considered most 
were relief drainage pattern, vegetation, 
and colourtone (grey tone). During field 
work the mapping units were further ins 
pected to check soils boundaries as well 
as the interpretation. The map unit bou 
ndaries were finaly transfered to a topo 
graphical map of scale 1:100,000 by hand. 
Two mainlandtypes were mapped from the 
photos. 
1. The Alluvial flood plain - (a) 
The topography is generaly nearly level 
and flat but with local scars and meanders 
of ponded marshes. On the photographs 
the unit was charcterized by dark tone 
depicting of wetness on the ground (caused 
by flooding). The vegetation was chara 
cterised by tine texture of grass vegeta 
tion. 
2. The Coastal plain (C) 
The topography is gently undulating to 
undulating with few defined inter mittent 
stream valleys which enter the alluvial 
flood ¡»lain. The woodland vegetation was 
visualized on photos by coarse light grey- 
t one . 
2.4. Legend 
The legend reflects the kind of survey 
which has been made. As has been dismissed 
previously, the boundaries between mapping 
units were established by topographical 
features observed on the photographs and