GIS-Based Identification of Flood Conditioning Factors and Hazard Rating in Yola North Local Government Area, Adamawa State, Nigeria (Published)
This research aimed at identifying flood conditioning factors and hazard rating in Yola North Local Government Area, Adamawa State, Nigeria with geospatial technology. The data used include ASTER with 30m spatial resolution, Landsat 9 OLI multispectral data (2023), and flood and non-flood points. This research was achieved by preparing flood conditioning factors and assessed flood hazard rating in the study area. The data used for this research includes; the satellite imageries covering the study area of 1980-2021, Digital Elevation Model, Curvature, Aspect, Slope, Topographic Roughness Index (TRI), Topographic Wetness Index (TWI), Stream Power Index (SPI), Sediment Transport Index (STI), Land Use/Land Cover (LULC) measurements, Distance To The River, Soil, Rainfall, Total Flow Accumulation, Flood Points and Non-Flood Points to achieve the stated objectives. The data were used as an input for Geospatial analysis. The study analyzed land use, aspect values, distance to streams, flow accumulation, and other factors to assess flood risk. Built-up areas (33%), farmland (25%), and bare land (18%) were identified as significant land use types. Aspect values ranged from low (-1 to 63) to high (289 to 358). Distance to streams ranged from 250m to over 2000m. Areas with high flow accumulation and direction values are prone to flooding. Rainfall ranged from 0mm to 348.1mm in August. River basin values indicated larger catchment areas in some areas. Slope values ranged from 0.76 (low) to 13 (high). Soil characteristics and SPI, STI, TRI, TWI, and NDWI values also indicated varying levels of flood risk. The study’s results can be used to inform flood mitigation strategies. The results showed that 58% of the area has a low degree of hazard, while 18% has an extreme hazard, 17% has a significant hazard, and 6% has a moderate hazard. The study identified areas prone to flooding, including those with low elevation, proximity to water bodies, and poor drainage. The findings suggest that land use patterns, topography, and soil characteristics significantly influence flood risk rating in the study area. Therefore, the results of this study are useful in flood mitigation strategies, such as identifying flood-prone areas for targeted interventions, designing drainage systems and flood protection infrastructure, and planning evacuation routes and emergency response plans.
Keywords: : GIS, Flood, Yola North, conditional factor, hazard rating
Geographic Information System (GIS) Assessment of the Impact of Flooding on Residential Buildings in Akure, Nigeria (Published)
Flooding has caused the deaths of people, collapse of buildings, destruction of properties, and a lot of worries to occupants in Nigeria. In spite of persistent incident of flooding in many areas, the researches that are aimed at lessening the impacts of flooding, especially on residential buildings close to riverbanks are few. The study assessed the influence of flooding on residential buildings in Ajeromi Community of Ondo State, Nigeria using Geographic Information System (GIS). A triangulation research approach involving structured questionnaire, personal observation and the application of Geographic Information System (GIS) were used. Data were collected from the occupants of buildings and GIS was used to collect information on the geo-referencing of affected buildings showing river channels, contours, and the topography of the area. From the result, the major effects of flooding were; paint defects, present of rot and mould, damage to the finishes of buildings, wall dampness, and cracking of ground floor due to uplift pressure. The major reason for vulnerability of these residential buildings to flooding were heavy rainfalls and climate changes, construction of buildings closes to waterways, and poor physical planning of the community. Flood resilience measures for residential occupants in the areas includes adequate channelization of waterbodies and avoidance of waterways when constructing buildings. All the results correlated with the findings of results from physical assessment and GIS geo-referencing. Based on the findings, GIS can be used to assess residential buildings to prevent flooding and enhance flood resilience.
Keywords: : GIS, Flooding, Impact, Nigeria, Residential Buildings
Using smart phones-based apps, computer applications and Geographic Information System (GIS) in real estate practice (Published)
The world has advanced technologically to the extent that information can be assessed anywhere around the globe in the comfort of ones living room. Moreso, with the coming of pandemic which also help advanced the course of online transaction, it becomes imperative to explore technological advancements that were made in order to navigate through those challenges. It is based on the above that this study explored the application of GIS vis-à-vis the use of GCP/GPS, phone-based apps, google earth interface, and others on real estate practice. The study illustrated practical steps taken via the use of GCP/GPS as well as google earth interface. The findings indicated that GCP/GPS can be used to gather location information of properties/location whereas the google earth interface can be used to do a variety of things, including getting directions and distance of places as well as measurement of length/areas of land and landed properties. It is expected that the illustrations provided will further help professionals especially who are yet to embrace the new way of carrying out certain task in relation to real estate will aid them in their service delivery.
Citation: Christian Osita Ifediora and Dumebi Jessica Efobi (2022 ) Using Smart Phones-Based Apps, Computer Applications and Geographic Information System (GIS) In Real Estate Practice, British Journal of Environmental Sciences, Vol.10, No.1, pp. 32-45
Keywords: : GIS, GCP, GPS, Real Estate, professional practice