This study uses a high resolution digital orthophoto derived from an Unmanned Aerial Vehicle (UAV) aerial photographs to update the landuse map of the Obafemi Awolowo University Campus while focusing on the built up environment. An aerial survey was conducted in the study area using commercially available low-cost Phantom II Vision Quadcopter. Sets of overlapping aerial photographs captured with optical camera on-board the UAV were used to produce 8 cm orthophoto. A digital copy of 1987 landuse paper map of the campus was obtained by heads-up digitizing, the digital map was then overlaid on the orthophoto from which new buildings and features were extracted and populated with relevant attributes. The updated landuse map of the Obafemi Awolowo University campus which was produced shows an addition of 187 building structures, with sizes ranging from small service centres to large administrative blocks. Most of the new buildings were built around the existing ones but there is gradual aggregation of structures at the eastern part of the campus. This may lead to increased pressure on some basic facilities such as congestion on roads leading to these areas during peak period.
The study was able to show that the use of micro UAV is a cost effective way to derive high resolution spatial datasets which could be used for management and monitoring landuse changes and effective land planning in a small area such as a university campus.
This work is about the observation of some cuticles recovered from the fossil Angiosperms leaves collected from the Neyveli lignite mines, the leaves are in compressed form. The fossil cuticles were recovered from the fossil leaves using concentrated Nitric acid with a few crystals of Potassium chlorate crystals. The cuticles are belonging the Shorea sp, Cryptostegia sp and Hedycarya arborea. Apart from the leaves the genus Shorea sp reported in the form of pollen and wood in the Neyveli lignite formation. The presence of these fossil taxa observed at the Neyveli lignite formation indicates the prevalence of warm humid climate in the area during the sedimentation.
Palynological investigation of T–Well located in the South Western Niger Delta was carried out using 26 ditch cuttings to date and infer paleoenvironment of the sediments penetrated by this interval. The analysis showed - moderately rich palynofloral content consisting of angiosperm pollen grains, ferns and fungi spores, algae and dinoflagellates cysts. Two Pantropical Zones of Magnastriatites howardi and Crassoratitriletes vanraadshooveni were delineated using some stratigraphic markers such as, Crassoratitriletes vanraadshooveni, Verrutricolporites rotundiporis, Psilatricolporites crassus, Retitricolporites irregulari, Monoporites annulatus, Zonocostites ramonae, Verrucatosporites sp, Pachydermites diedderixi, Magnastriatites howardi and Striatricolporites catatumbus. These Zones are of Early to Middle Miocene age. The sediment is made of 70% shale and 30% sand of progradational paralic Agbada Formation. The palynological analysis revealed dominance of mangrove swamp, rain forest, freshwater plants which suggest warm, humid and heavy precipitation tropical coastal climate. Also the dominance of terrestrially derived palynomorphs over marine taxa infers a lot of continental influence in coastal area ranging from fluvio-deltaic to a shallow marine setting.
El Fayoum and Wadi El Natrun are typical examples of desert depressions, differ in nature; El Fayoum is connected with the Nile Valley by a major irrigation network, while Wadi El Natrun is inserted in the Eaolian desert landscape. Remote sensing and GIS spatial analysis were employed to assess the magnitude and geographical distribution of land resource and environmental hazard susceptibility, in addition to create and develop different thematic layers to evaluate potentiality for sustainable development in the studied depressions. The land resources database shows that the soils associated with recent alluvial terraces dominate the depressions. Multi-temporal satellite images revealed that urbanization mainly occurred on the account of most fertile soils of El Fayoum depression, hence shrinking the high and moderate capable soils. Wadi El Natrun depression and its expansion are potential areas for agricultural purposes. Land use/ cover maps clearly show that the El Natrun depression does not undergo significant hazards, as the expansion of urban and agricultural areas occur on the count of bare land. It could be concluded that desert depressions represent promising areas for sustainable development. The depressions connected to active river systems, such as El Fayoum, may support integrated sustainable development. The establishment of basic infrastructure in isolated depression areas, such as Wadi El Natroun, encourages sustainability in areas located at the open deserts.
The morphometric analysis of the drainage basin and channel network plays a vital role for understanding the geo-hydrological behavior of drainage basin and its implication on flood. Besides the primary aim of studying drainage basin as a geographical unit in order to understand its hydrological nature, this study examined the morphometric characteristics of Oba river drainage basin in the South-west of Nigeria with the use of GIS in order to evaluate the implication of the morphometric characteristics on flood potential in the study area. The basin was found to be of 6th order where the total length of streams was 2754.48 km, total number of streams was 2979, basin area and perimeter were 2494.45 km2 and 291 km respectively while the basin length was 96.1km. The detailed morpometry results obtained in the study, to a significant extent, were found to be helpful for determining the tendency for flood events in the watershed.