Abstract
We investigate 85 129 MODIS satellite active fire events from 2007 to
2015 in the Niger Delta of Nigeria. The region is the oil base for
Nigerian economy and the hub of oil exploration where oil facilities
(i.e. flowlines, flow stations, trunklines, oil wells and oil fields)
are domiciled, and from where crude oil and refined products are
transported to different Nigerian locations through a network of
pipeline systems. Pipeline and other oil facilities are consistently
susceptible to oil leaks due to operational or maintenance error, and by
acts of deliberate sabotage of the pipeline equipment which often result
in explosions and fire outbreaks. We used ground oil spill reports
obtained from the National Oil Spill Detection and Response Agency
(NOSDRA) database (see www.oilspillmonitor.ng) to validate MODIS
satellite data. NOSDRA database shows an estimate of 10 000 spill events
from 2007 - 2015. The spill events were filtered to include largest
spills by volume and events occurring only in the Niger Delta (i.e. 386
spills). By projecting both MODIS fire and spill as ‘input vector’
layers with ‘Points’ geometry, and the Nigerian pipeline networks as
‘from vector’ layers with ‘LineString’ geometry in a geographical
information system, we extracted the nearest MODIS events (i.e. 2192)
closed to the pipelines by 1000m distance in spatial vector analysis.
The extraction process that defined the nearest distance to the
pipelines is based on the global practices of the Right of Way (ROW) in
pipeline management that earmarked 30m strip of land to the pipeline.
The KML files of the extracted fires in a Google map validated their
source origin to be from oil facilities. Land cover mapping confirmed
fire anomalies. The aim of the study is to propose a near-real-time
monitoring of spill events along pipeline routes using 250 m spatial
resolution of MODIS active fire detection sensor when such spills are
accompanied by fire events in the study location.