Ohamobi, Sylvester Ikechukwu.
'JAPRS, Vol. XXXIII, Amsterdam, 2000
SOIL ENGINEERING INTERPRETATION FOR ROAD ALLOCATION IN SOKOTO -.
CE = : ~~ STATE NIGERIA x k | :
din . -. SL OHAMOBI, C.0 OFOEGBU |
NIGERIA BUILDING AND ROAD RESEARCH INSTITUTE , LAGOS , NIGERIA
certe Infonet@lynxniger.8m.com | | e IM nud "s
Paper number: 1435
KEY WORDS: :Soil Interpretation, Allocation, Remote Sensing, GIS, Suitability Rating, Land Evaluation.
- ABSTRACT
The necessity for a rational soil interpretation system for the allocation of roads and other engineering purposes, and for the collation,
storage and retrieval of relevant engineering information on regional basis has been recognized for sometime. A terrain evaluation
scheme suitable for engineering purposes, for example road construction, should be the one that engineers can apply and interpret. No
special skills should be required for its implementation. The scheme should bé.compatible with all facilities that geographic
information system (GIS) should offer, so that information can be stored for future use. Soil engineering interpretation for roads in
this research involves the use of soil and construction material properties determined both in laboratory and in.the field and modified .
rating tables. A terrain evaluation of the Sokoto area was conducted using remote sensing and GIS tools. Estimated soil properties
significant to engineering and analytical data were put in tabular forms and interpreted using rating tables. The engineering properties
of the mapping units'and analytical tables were the summarized properties of soils and road construction materials. The rating tables
(suitable and limiting) were used each for interpreting corresponding five selected road allocation attributes ( local roads and streets,
sands and gravel, shallow excavations, road fills, and top soils). The results of the interpretations were the products of the five
attribute maps, which were in turn used for the production of unweighted and weighted suitability maps for road allocation. The final
map showed four simulated roads and one existing road. In conclusion, it is found that the system embracing terrain evaluation using
remote sensing and GIS is flexible enough to handle information at all levels and thus can be used to collate, store, retrieve at will,
transform/analyze and display data accumulated during road planning, allocation and construction projects. The study shows that with |
the terrain evaluation and scenarios using five selected attributes relevant to road construction, road network can be planned and
allocated. It is also noted that terrain evaluation for engineering purposes, use a classification similar to that widely adopted in :
agricultural and land use surveys. jk KC
1. INTRODUCTION :. | sonate | * ;
1.1 Study Area Location. | .-
The study area is located in the north central part of Sokoto State of northwestern Nigeria. It is in the semi-arid region of the world
and can be found within latitude 13° 00'N to.13* 10'N and longitudes 5° 00'E to 5° 30'E of Greenwich Meridian (figure 1). It has a
surface area of 97,000 hectares. Wi tds
5°00E . : : ; : $930E
13910^N [7
i900'NL. 7
* ‘Figure 1: Location Map of the study area
'
* *
1.2 General Characteristics of Study Area
1058 International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B7. Amsterdam 2000.
