Ohamobi, Sylvester Ikechukwu 
3.4 Shallow Excavations 
E rr TAPRS, MOL NUIT, Amsterdam, 2000 
Shallow excavation attribute map indicated only moderate suitability at the upper and lower slopes of the piedmont and poor at the 
slope vale complex of the piedmont, valleys and the plateaux. : 
358 - Topsoil 
me 1 
> 1 
sol attribute map showed all ie classes of good, moderate and poor units in the study area. These are as follows : good in the 
' upper slope, moderate in the lower slope and poor in slope- vale complex, valleys and plateaux. 
° 
3,6 . .. Final Road Allocation Map 
bum This map displays one existing and four simulated roads. The map used the options of joining important towns and industrial/farming 
centers to other places. The resulting road network map (figure 3) shows that road allocations in the study area and in similar terrain 
and climatic conditions would be better done within the piedmont locations. This is because of the seemingly low constructibn costs 
in terms. of less obstacles, availability of construction materials and less interference to agricultural lands. This result was also 
confined 5 Zinck (1990). 
  
  
  
  
  
  
Ae !| Poor 
g P. | Mad EE settlement 
i | SOM, M "cas ^ Figure s | SELECTED NETWORK ROUTES : D: 
es — : j o ESE a Feisty road, and b,c.d.,e = simulated roads! ' : 
i. The map shows that all the four new roads (simulated) have mostly good allocation units except for the one labelled "b" which is a - 
short-distance road which did not take into account the avoidance of obstacles and others. The existing road "a" is the worst allocated 
A road because it has poorly : suited units in almost all the Stretch of the road. Hence, the existing road requires upgrading by removing 
inal the obstacles to improve: the road condition. put à ‘ or ' 
4. CONCLUSION 
It is fomdi in this M that tlie system embracing terrain evaluation using remote sensing and GIS is flexible enough to handle 
information.at all levels. Thus it can be used to collate, store, retrieve at will, transform/analyse and display data accumulated during 
d road planning, allocation and construction projects. 
n 
The study shóws that with terrain evaluation and scenarios using ‘the five selected attributes relevant to road construction, road 
network can be planned and allocated. ' : 
The study also shows that voad allocation is better done in the piedmont: than in any other landscape of the study area as shown | in 
figure 3. This also applies to any other place with similar terrain and climatic conditions. This is true because of the suitable terrain 
properties of the area, and also the seemingly low construction costs in terms of less obstacles, availability of construction materials 
and less intérference to agriculturals lands. : 
  
It is found that since terrain evaluation í is based on the classification of soils and landform, itis particularly suited for use with remote 
sensing techniques especially. that of aerial photographs. 
  
International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B7. Amsterdam 2000. 1063