Analysis of Elevation Models for Nigerian 2D Cadastre Height Determination

In Nigeria, the spatial requirements of cadastral map for the purposes of land registration are based on 2D planimetric boundary coordinates without consideration for the elevation component of geometric space. Whereas, recent development in technology and practises in many countries requires the inclusion of elevation component into the cadastre. The specific objectives of this study are to determine elevation values for existing 2D cadastre of the study area from different data sources and to analyze those elevation values using statistical means. Data were sourced from both primary and secondary sources; secondary data include a 30m by 30m resolution Global Digital Elevation Model (GDEM), Shuttle Radar Topographic Mission Data (SRTM), 1:50,000 topographic map and existing Digital Elevation Model (DEM) of the study area. Ten ground control points were established at 250m grid with Global Positioning System in differential mode and elevation data were obtained accordingly. Elevation values of selected existing planimetric controls (33) were also determined from adopted data sources and were compared using both the standard deviation and the Root Mean Square Error (RMSE). The vertical accuracy obtained from Topographic map data, existing DTM,  ASTER data and SRTM data were ± 1.860, ± 3.450, ± 5.309 and ±4.573 respectively relative to elevation values obtained from GPS observation of corresponding selected existing 2D planimetric controls. The degree of association between elevation values obtained from adopted data sources was strong and positive as shown from the regression analysis. The study established that only topographic map elevation data would presently fit GPS elevation data for 3D cadastre implementation for the study

Internet application for online cadastral services : a case study in Nigeria

The new innovative of technology by (GIS) Geographic Information System, (LIS) Land Information System and (CIS) Cadastral Information System has been playing a leading role in the development of cadastral and land administration in this study area. The Customary ways and approach to the land titling and registration in the time past has resulted in the delay in the processes of obtaining title to the land. Land administration system in Nigeria includes the processes of land registration, cadastral mapping, land valuation and land inventory. Most of developing nation particularly Nigeria is faced with the problem of poor land administration and management. Technology is paramount in acquiring a proper technological development in land administration. This study tried to encourage land title registration by providing web technologies that are faster and suitable with a low rate and minimum delay. The need to develop a dynamic web for the processes in the land registration arises from the dynamic relationship to the land of the people. The delay in time and process of land registration couple with the exploitation in land related activities has called for the urgent intervention of all the stakeholders in land administration. PHP programming language was used as a server side scripting languages together with MyAdmin SQL, a website was developed for the processes involved in the land registration having examined the fastest way to solve the problem. A robust dynamic database that is reliable and easy to use was also developed which is capable of accommodating several numbers of applicants. The applicants, monitoring agency and the government have the advantage of checking all the processes on line without any contact with the officers working on the certificate

ANALYSIS OF ELEVATION MODELS FOR NIGERIAN 2D CADASTRE HEIGHT DETERMINATION

In Nigeria, the spatial requirements of cadastral map for the purposes of land registration are based on 2D planimetric boundary coordinates without consideration for the elevation component of geometric space. Whereas, recent development in technology and practises in many countries requires the inclusion of elevation component into the cadastre. The specific objectives of this study are to determine elevation values for existing 2D cadastre of the study area from different data sources and to analyze those elevation values using statistical means. Data were sourced from both primary and secondary sources; secondary data include a 30m by 30m resolution Global Digital Elevation Model (GDEM), Shuttle Radar Topographic Mission Data (SRTM), 1:50,000 topographic map and existing Digital Elevation Model (DEM) of the study area. Ten ground control points were established at 250m grid with Global Positioning System in differential mode and elevation data were obtained accordingly. Elevation values of selected existing planimetric controls (33) were also determined from adopted data sources and were compared using both the standard deviation and the Root Mean Square Error (RMSE). The vertical accuracy obtained from Topographic map data, existing DTM, ASTER data and SRTM data were ± 1.860, ± 3.450, ± 5.309 and ±4.573 respectively relative to elevation values obtained from GPS observation of corresponding selected existing 2D planimetric controls. The degree of association between elevation values obtained from adopted data sources was strong and positive as shown from the regression analysis. The study established that only topographic map elevation data would presently fit GPS elevation data for 3D cadastre implementation for the study