DSpace Collection: Surveying & Geoinformatics

Evaluation and Systematic Desktop Review Protocol for Land Administration in Niger State, Nigeria

2026-05-21T04:46:05Z

Title: Evaluation and Systematic Desktop Review Protocol for Land Administration in Niger State, Nigeria Authors: Gbedu, A. M.; Samaila-Ija, H. A.; Zitta, N.; Olaniyi, A. M.; Adeniyi, G.; Baba, M.; Daniyan, A. M.; Barde, I. J. Abstract: Cadastral surveying provides the legal and spatial foundation for secure land tenure, effective land-use planning, and sustainable resource governance. Despite its growing importance, the cadastral system in Niger State, Nigeria, remains constrained by limited survey coverage, analogue workflows, infrastructural deficits, and fragmented geospatial data ecosystems. This study presents a PRISMA 2020–compliant systematic desktop review of literature published between 2017 and 2025, with particular emphasis on recent peer-reviewed studies, government reports, and professional assessments from 2023–2025. Major bibliographic databases, institutional repositories, and regulatory publications were systematically searched, screened, and synthesized using explicit eligibility criteria. Findings indicate that approximately 23% of the State’s land area has been formally surveyed, while cadastral operations remain predominantly manual despite the availability of GNSS-based technologies. Persistent barriers include inadequate technical capacity, insufficient and unstable funding, weak institutional coordination, poor data interoperability, and the absence of a unified digital cadastral framework. Nevertheless, emerging innovations—such as AI-assisted boundary extraction, cloud-based GIS platforms, and the National Geospatial Data Infrastructure (NGDI)—offer substantial opportunities for reform. Based on synthesized evidence, the study proposes a structured, multi-pillar roadmap encompassing institutional reform, capacity development, standardized datasets, and phased adoption of digital geospatial technologies. The review contributes to contemporary scholarship on digital land administration and provides actionable guidance for policymakers, survey professionals, and geospatial agencies in Nigeria and comparable developing contexts.

GIS-BASED MULTI-CRITERIADECISIONANALYSIS(MCDA) FOR OPTIMALSOLIDWASTEDISPOSALSITESELECTIONINJALINGO METROPOLIS,TARABASTATE,NIGERIA

2026-05-18T20:47:50Z

Title: GIS-BASED MULTI-CRITERIADECISIONANALYSIS(MCDA) FOR OPTIMALSOLIDWASTEDISPOSALSITESELECTIONINJALINGO METROPOLIS,TARABASTATE,NIGERIA Authors: Gbedu, Adamu Mohammed; Samaila–Ija, H. A; Bako, M; Zitta, N; Atenji, D; Daniya, A Abstract: Rapid population growth and urban expansion in Jalingo Metropolis, Taraba State, Nigeria, have led to a significant increase in municipal solid waste generation, creating serious environmental and public health challenges. The absence of scientifically selected landfill sites has contributed to indiscriminate waste disposal, land degradation, and potential contamination of nearby water bodies. This study therefore aimed to identify environmentally suitable locations for solid waste disposal using a Geographic Information System (GIS)-based Multi-Criteria Decision Analysis (MCDA) framework. Four key criteria—road accessibility, proximity to drainage networks, buffers around built-up areas, and topographic conditions—were selected in accordance with environmental guidelines and international best practices for landfill siting. Spatial datasets, including QuickBird satellite imagery, Shuttle Radar Topography Mission (SRTM) Digital Elevation Model (DEM), and municipal geospatial datasets, were processed using ILWIS, ArcGIS, and IDRISI Taiga. The Analytical Hierarchy Process (AHP) was applied to determine the relative importance of the criteria, while Boolean overlay techniques were used to define constraint layers. A Weighted Linear Combination (WLC) model was subsequently employed to integrate the criteria and generate a landfill suitability map for the study area. The suitability analysis classified the study area into three categories: highly suitable, moderately suitable, and unsuitable zones for landfill development. Results indicate that 28% of the study area is highly suitable, 17% moderately suitable, and 55% unsuitable for landfill siting. Five potential sites were identified, with Site 3 ranked most suitable due to its accessibility, minimal environmental impact, and land availability. Sensitivity analysis confirmed the robustness of the model. Findings provide a scientific basis for evidence-based urban solid waste management, offering a practical decision-support tool for local authorities

Optimizing Campus Radio Wave Reach and Field-Signal Study of Search FM 92.3 MHz in Minna, Nigeria

2026-05-18T20:33:43Z

Title: Optimizing Campus Radio Wave Reach and Field-Signal Study of Search FM 92.3 MHz in Minna, Nigeria Authors: Gbedu, Adamu Mohammed; Adeniyi, Gbenga; Sulayman, Z. A. T; Samaila-Ija, Hassan A. Abstract: Geographic information systems (GIS) and viewshed analysis are powerful tools for communication-network planning, particularly for modeling radio-wave propagation and optimizing transceiver locations. This study integrates GIS-based viewshed modeling with field-measured electric-field strength to assess and improve Search FM 92.3 MHz broadcast coverage at the Federal University of Technology, Minna (FUT-Minna), Niger State, Nigeria. A geo-referenced digital map of Minna Metropolis was processed in AutoCAD Land Development and imported into ArcGIS 10.1. Field measurements electric-field strength (30–120 dBµV) using a GE-5499 Digital Signal Level Meter, plus GPS-derived coordinates and altitude were collected along five drive routes (A–E), alongside line-of-sight (LOS) distances. A digital elevation model (DEM) from ASTER imagery, integrated with satellite data, enabled viewshed analysis for the existing 52 m mast and a proposed 80 m site. Statistical analyses (linear regression, Pearson correlation, one-way ANOVA) examined signal strength relationships with distance and terrain. Results indicate only 23% of the 39,100-ha study area achieves primary (Grade A) coverage, with 51% secondary and 26% fringe. Regression showed a strong negative LOS distance-signal association (r = –.78, p < .001); ANOVA revealed route variations, F (4, 95) = 12.30, p < .001. Viewshed modeling suggests relocating to higher terrain could boost Grade A coverage to 45% (+22 percentage points). Terrain obstacles like Maitumbi Hills, buildings, and vegetation cause nonline-of-sight zones and multipath loss. This pioneering GIS-field integration for Minna FM coverage offers a practical framework for antenna optimization and mast siting

Preliminary Adjustments for Establishment of the Lagos Gravity Network (LAGGNET) 017

2026-05-18T20:19:13Z

Title: Preliminary Adjustments for Establishment of the Lagos Gravity Network (LAGGNET) 017 Authors: ODUMOSU, Joseph O; SAMAILA-IJA, Hassan A; PAUL, Temitope E; NNAM, Victor Abstract: Preliminary adjustments for the establishment of the Lagos gravity network (LAGGNET) is herein presented. A gravity network is highly required for proper definition of a regional height system and also geophysical exploration activities. Horizontal control reliability test for the proposed network has been done using the Gauss Marcov functional model in a single constrained network with observation equations formed from the vector of baselenghts. Also the drift rate, atmospheric pressure corrections and latitude corrections have also been computed within the study area along an observation baseline called the Yaba – onipanu calibration line comprising of 4 control points within a total observation time of 77mins. The standard error of horizontal positions within the control network was found to be ±0.0051𝑚. The drift rate of the gravimeter was found to be 0.0007mgals/min and atmospheric pressure correction values between -0.009 to 0.027mgals were obtained. Insignificant latitude correction was observed due to the near-equatorial nature of the study area.