Geography Reference
In-Depth Information
rainfall) from the Oyan dam constructed on the Oyan river, a tributary of River
Ogun in Ogun State which is an operational regulation of the management to
ensure safety and avoid dam failure; the second is the wave induced sea level
rise which forces its waters into the Lagos Lagoon and consequently dis-
charging into the floodplain and surrounding lowlands.
3. D ATA
The application of GIS techniques in flood risk analysis and modeling
requires a wide range of spatial dataset from different sources. Such dataset
include high resolution space borne images collected with active earth
observation system technology. Studies (Nkeki et al., 2013; Triglav-Cekada
and Radovan, 2013; Townsend and Walsh, 1998) in the field of spatial
sciences have shown that the utilization of this technology and GIS platform
has become an integrated, well improved and reliable approach in disaster and
risk management.
In this chapter, the Shuttle Radar Topography Mission (SRTM) remote
sensing data was used to generate elevation components, and on the other
hand, Landsat and Google earth datasets were used to assess the urban foot-
print and the land use physiognomies of the study region. The former, is a 90-
meter spatial resolution digital elevation model (DEM) developed by SRTM.
Originally, this data is produced by National Aeronautics and Space
Administration (NASA), and it has become a major advancement in digital
terrain modeling and provides free and easy access to high quality elevation
data for researchers worldwide (Nkeki and Asikhia, 2014).
Figure 4. Aerial view of flood hazard in River Ogun floodplain.
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