Surveying & Geoinformatics

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Surveying & Geoinformatics

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    Applications of Remote Sensing Data for Environmental Modelling and Analysis
    (International Conference of School of Technology Education, Federal University of Technology, Minna, Nigeria, 2014-10-15) Onuigbo, I.C., Odumosu, J.O., Adesina, E.A., & Iwuchukwu, K.
    As the ever-growing world population continues to impose immense pressure on the environment, the dynamic balance between environmental stability and resource utilisation is continuously being threatened. Considering the global coverage of this menace, remote sensing appears to be the most economic and efficient means of data acquisition for monitoring and analysing environmental degradation patterns. Five (5) different satellite missions and an online vector-based digital Soil Map have been theoretically examined to evaluate their data products, spatial and spectral resolutions, applications, and source of data access.
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    Analysis of the Effect of Orbital Perturbation on Global Navigation Satellite System Precise Point Positioning Technique
    (Nigerian Journal of Surveying and Geoinformatics (NJSG), 2016) O. G. Ajayi, C.V. Okorocha, E.A. Adesina, K. Sanni
    Post-processing of Global Navigation Satellite System (GNSS) observations from Continuously Operating Reference Stations (CORS) require that, corrections for satellite orbital perturbation be applied to the downloaded CORS ephemeris data prior processing. This study aims at investigating the extent of the effect of orbital perturbations on Precise Point Positioning (PPP). Four (4) processing techniques adopted include the direct broadcast ephemeris Only, IGS ultra-rapid orbit solution, IGS rapid orbit solution, and IGS final orbit solution. The solutions from the four approaches were compared and the results showed estimated errors of 7m, 1m and 1m for East, North and Height components respectively.
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    Evaluating the Impact of the Spatial Resolution of Digital Elevation Models on Flood Modelling
    (Water Resources Management (Springer), 2025-04-23) Ekundayo Abayomi Adesina  · Joseph Olayemi Odumosu  · Oluibukun Gbenga Ajayi  · Ahmed Musa  · Ifeanyi Chukwudi Onuigbo  · Adeolu Richard Adesiji
    Accurate flood modelling is crucial for effective disaster management. This study investigated the impact of different Digital Elevation Model (DEM) resolutions (1 m UAV, 10 m InSAR, and 30 m SRTM) on flood modelling within the Shiroro floodplain, Nigeria. Using the Shallow Water Equations (SWE) implemented in MATLAB to assess flood levels along 12 river channels within the study area, the findings demonstrated that the UAV-derived 1 m DEM provided the most accurate flood predictions, exhibiting lower RMSE values (0.249 m) compared to InSAR (0.352 m) and SRTM (0.455 m). The higher resolution of the UAV DEM captured topographic details more effectively, leading to more accurate flood predictions, in contrast to the low resolution of InSAR and SRTM, which resulted in an overestimation of flood risk due to the smoothing and generalization of topographic features. These results highlight the critical importance of using high-resolution DEMs, particularly those derived from UAV imagery, for accurate flood modelling and effective flood risk management, as these high-resolution datasets can significantly improve flood forecasting, refine flood hazard maps, and inform targeted flood mitigation measures, ultimately enhancing disaster preparedness and response within the Shiroro floodplain and beyond.
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    URBAN AGRICULTURE: A NEW PERSPECTIVE IN FOOD SECURITY IN NIGERIA
    (International Journal of Emerging Trends in Engineering and Development, 2013-03) Nwose, I.A. and Adesina E.A.
    This paper aims to highlight and assess urban agriculture as a new perspective in food security in Nigeria. It deserves highlighting because its expositions and place in sub-Saharan economic history have been embedded in broader arguments, creating a heuristic need to give it a balanced and lucid examination. Indeed, it needs revision to realize more of its potential than has been revealed to date. Specifically, it will be argued that urban agriculture is specific to effectively realizing food security in Nigeria. The paper will also explore the implications of improved urban agriculture for an understanding of food security in Nigeria. It will examine the investments in urban agriculture and food security techniques that could be adopted in Nigeria.
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    Assessment of the Hydrological Characteristics of Shiroro Dam, Nigeria
    (School of Environment Technology, Federal University of Technology, Minna, Nigeria, 2023-02-08) Adesina, E.A, Musa, A. Onuigbo, I.C., and Adesiji, A.R.
    Flooding in recent times has been linked to various hydrological characteristics that are associated with dams and their surrounding features, some of which are outflow, inflow, rainfall, temperature, and water elevation, among others. Although its causes have been traced to natural and human-induced factors, it is also important to investigate the various hydrological characteristics of dams to understand and manage flooding. The relationship between these features has a great effect on the amount of outflow, which in turn relates to the flooding of communities downstream. This study seeks to assess and analyse the impact of inflow, rainfall, temperature, and water level on the outflow of water from the dam. This impact was evaluated using statistical techniques such as time series, correlation, and regression analysis. The result shows that outflow in dams has a positive correlation of 0.280738, 0.873933, 0.148858, and 0.55576 with rainfall, inflow, temperature, and water elevation, respectively. Water inflow and elevation thus have a greater influence on water outflow, R2 values show that inflow can predict 76.4% of the volume of outflow while temperature has the lowest value of 0.22%. More study of the factors that influence inflows has been recommended, as has the forecast of future outflows and output.
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    A Review of Geographic Information Systems Applications to Election Mapping in Nigeria
    (School of Environmental Technology, Federal University of Technology, Minna, Nigeria, 2018-04-12) Okolie, C.J., Adesina, E.A., Irivbogbe, H.E., and Umar, A.A.
    Elections are the major hallmark of democratic societies and many countries have begun applyi Geographic Information System (GIS) to manage the electoral process. GIS is also utilised by political parties to access the dispositions of voters and determine where to focus their campaign efforts. In a GIS, a combination of thematic layers of administrative areas such as population and land use can yield meaningful relationships or scenarios critical to decision-making processes and this makes it an exceptional tool for the management and analyses of election at all stages. Nigeria’s national electoral body, the Independent National Electoral Commission (INEC) has not been very proactive in leveraging GIS and Information Technology for ensuring hitch-free, free and fair elections in the country. GIS is key in enforcing the transparency of this system. This paper review the developments of GIS for election mapping in Nigeria and discusses their applications in Nigeria’s electoral system. The study shows that the status of GIS applications for electoral mapping in Nigeria is still in an infancy stage. The critical turning point lies in the full exploitation of GIS by the government’s electoral apparatus.
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    Application of Location-Based Service for Flood Vulnerability Assessment of Part of Minna, Niger State, Nigeria
    (School of Environmental Technology, Federal University of Technology, Minna, Niger State., 2020-05-05) Adesina, E. A., Adewuyi, A. I., & Berthran, C. B
    Flood disaster has been a global emergency issue, the cause my be traced to both natural and man-influence factors, the alarming increase in global warming has an underlying effect on glacial melting, sea level rise etc., these, coupled with the effect of human activities such construction along floodplain, deposit of waste in rivers etc., have pose a threat not only lives but putting properties into danger. To alleviate the effects of this flooding, emergency agencies and individuals must be informed about the status of this emergency. Flood vulnerability status is thus a reliable solution to such a problem. How will individuals get the current vulnerability status of their current locations? The research revolves around creating an android application capable of indicating the vulnerability to flooding points within the study area. Data sources include the administrative map, Digital Elevation Model, and Landsat Imagery with bands 6, 7, and 8. ArcGIS software was used to produce the study area's flood vulnerability information and database. Different elevation ranges: very low, low, moderate, high, and very high) were classified to determine the flood vulnerability status. The Android application was developed using Android Studio. The location-based service in the mobile device helps to correlate the longitude and latitude information of points within the study with the database to determine the vulnerability status of an area to flooding on an average scale. It also stores such details. The results show that the study area is a relatively low terrain and is more vulnerable to flooding, with very low and low terrain having a percentage of 18% and 36%, respectively. The result also shows that only 11% of the study area is built up with vegetation, and farmland has a percentage of 18% and 22%, respectively. Although it was discovered that the flood vulnerability assessment can only be done within the study area, updates can be made to enable it to work for other areas.
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    A Remote-Sensing Based Assessment of Seasonal Variation in Vegetation Quality and Productivity in Nimbia Forest
    (Civil and Environmental Research, 2015) Ifeanyi C. Onuigbo, Joseph O. Odumosu, Ekundayo. A. Adesina, Nanpon. Zitta, Oluibukun G. Ajayi, Abdullahi A. Kuta
    Agriculture plays a vital role in the growth and sustainability of developing countries, such as those in sub-Saharan Africa. Therefore, there is a need to monitor and assess the changes taking place in vegetation quality and productivity. The conventional ground survey method has proved to be highly tedious, laborious, and grossly limited, especially when large and densely forested regions are concerned. This paper presents a remote sensing-based approach as a real-time technology to determine the effect and extent of water loss caused by seasons on vegetation quality in Nimbia forest, Kaduna State. ENVI 4.7, ArcGIS 10.0, and Global Mapper Software were used, and a discrepancy of about 45% in the quality of vegetation has been observed between seasons in the region under study.
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    SSESSMENT OF LAND DEGRADATION USING REMOTE SENSING APPROACH
    (Geodesy and Cartography, 2023-09-23) Ekundayo Abayomi ADESINA, Huzaifa Ishaq MUHAMMAD
    . Land degradation leads to the alteration of ecological and economic functions due to a decrease in the productivity and quality of the land. Land degradation over Minna, Niger State, was assessed using geospatial techniques. Studies between the rainfall and NDVI used on human-induced and climate-induced land degradation were correlated. Landsat images on a decadal scale (2000–2019) were processed and classified using a maximum likelihood classifier. NDVI trends are not due to rainfall dynamics to human actions. Averagely low, about 24.14%, correlation was found between the observed land degradation and the precipitation factor, yielding more than 50% congruence in degradation induced by human activities. The study discovered that the built-up and bare surfaces are increasing. The long-term changes in built-ups were a 96% increase between 2000 and 2019; conversely, a sharp decrease in vegetative lands of about –19.38%. Based on the terrain analysis, locations have less steep and moderate slopes in the study area due to continuous urban expansion and demographic pressure. Consequently, over time, available lands not degraded within the study areas would be reduced. The study recommended a proper land management system of land use allocation and land cover activities.
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    Evaluation of the various orthometric height systems and the Nigerian scenario – A case study of Lagos State
    (Journal of King Saud University – Engineering Sciences, 2015-09-12) J.O. Odumosu, O.G. Ajayi, F.F. Idowu, E.A. Adesina
    Though considered the easiest in 3-Dimensional Point Positioning, the choice of a height system, especially in areas with spatially vast land mass, is rather a complicated choice. Orthometric heights are naturally and fully referenced to the actual Earth gravity field, but laborious to compute considering the required approximations of gravity variation along the plumb line from the surface to the geoid. Normal heights, on the other hand, are less laborious to compute and do not require actual gravity observations. Unfortunately, natural height systems are the only systems that can efficiently predict fluid flows. This paper has therefore examined the theory and practical possibility of replacing the use of Helmert Orthometric Heights with Normal Orthometric Heights within Lagos State. A maximum height discrepancy of 1 mm was obtained in the comparison of both systems, and thus their replaceability was found suitable to within 3rd-order geodetic accuracy.