标题：An Assessment of the Existing Continuously Operating Reference Stations (CORS) in Nigeria: An Exploration Using Geographical Information System (GIS)
期刊名称：American Journal of Geographic Information System
印刷版ISSN：2163-1131
电子版ISSN：2163-114X
出版年度：2014
卷号：3
期号：4
页码：147-157
DOI：10.5923/j.ajgis.20140304.01
语种：English
出版社：Scientific & Academic Publishing Co.
摘要：The modernisation of the Global Navigation Satellite Systems (GNSS) has brought about significant changes in the methods of positioning and navigation. More recently, countries are adopting the continuous observation and measurements using a network of GNSS receivers called Continuously Operating Reference Stations (CORS) as the standard. For example, Nigeria has established 11 permanent GNSS Network (NIGNET) or CORS since 2008, which has provided the incentive for the adoption of the geocentric datum in all its geodetic activities. Unfortunately, the spatial coverage of the Nigerian CORS stations on a distance of more than 300km (between the stations) seems inadequate based on the global station densification standard of the International Terrestrial Reference Frame (ITRF). This study explores the CORS network and determines the suitability of improving the density of the existing CORS stations with a view to extending their spatial coverage in Nigeria. Data obtained from various sources are processed and analysed using buffer and Digital Elevation Model (DEM) techniques. The result shows that the existing CORS stations in Nigeria only covers about 25% of the country. Therefore, the study proposes new CORS stations that improve the distribution and the spatial coverage of the existing stations (to about 96%) in line with the ITRF’s standard.
