International Journal of Advances in Scientific Research and Engineering (ijasre) E-ISSN : 2454-8006 DOI: http://dx.doi.org/10.7324/IJASRE.2018.32592 Volume 4, Issue 1 January-2018 www.ijasre.net Page 95 Application of GIS and Remote Sensing Approach for the Analysis of Asaba Urban Street Network of Delta State, Nigeria Ojiako, J.C, Igbokwe, E.C. and Ossai, E.N. Department of Surveying and Geo informatics Nnamdi Azikiwe University Awka, Nigeria ___________________________________________________________________________________ ABSTRACT This study is aimed application of GIS and Remote Sensing approach for the analysis of Asaba Urban Street network of Delta State Nigeria. In this study, data were obtained from IKONOS satellite images, existing street guide map and from field work using the handheld GPS. The methodology adopted included data capture which was by scanning, digitizing, and fieldwork carried out for ground-truthing, annotation and for the collection of coordinates selected points. The acquired data were processed using ArcGIS10.2 software, Microsoft Excel and the Geo-Trans 3.3 software. Results of the analysis carried out revealed that the total number of roads was 2100 while the total distance of road network in the study area was 8,092.17km. In addition, the new roads had a total number of 1,650 roads while the old roads were totaled 550. Paved roads accounted for about 59% of the total roads network while unpaved made up 41% of the roads in the study area. The updated map was in turn used to analyze the traffic congestion pattern in Asaba and then solutions where proffered. It was therefore recommended among other things that the street urban map produced to be utilized as a decision support system in making the appraisal of the current state of the road networks in the study area. Keywords: Buffer, Map update, Geographic Information Systems, Network Analysis, Remote Sensing. ________________________________________________________________________________________________________ 1. INTRODUCTION From the earliest civilization, maps have been used to portray information about the earth‟s surface, navigators, land surveyors, town planners, military, architects, geologists, geographers use maps to show spatial distribution of important geographic features. Once produced, this graphic image (Map) becomes static, therefore, it should be expected that a map may be partly out- of-date by the time of its publication and it may have to continue in this state for a period of time (Keates, 1973). A map is a representation, on a plane surface, of the physical features (natural and artificial) of parts or the whole of the earth‟s surface at a given scale, by the use of orientation indicated (Ndukwe, 2001). High and accelerated rate of urban changes and urban area extensions as witnessed in developing countries such as Nigeria, calls for an efficient and fast technique for mapping the urban changes with the required accuracy and standard and for updating the existing maps. However, the processes used in the past for mapping and revision of maps had been the conventional land surveying method which was later replaced with the photogrammetric technique as a result of scientific research and innovations. Recently, a vast and cost effective tool versatile in the map production and updating process is been invented and in no distant time may replace the photogrammetric method. This is the satellite remote sensing technology. It was cited in the paper presentation by Igbokwe, (2013) on “Mapping of Regional Transportation Network with medium Resolution Satellite Imagery” during the 3 rd regional conference of International Federation of Surveyors (FIG) at Jarkarta, Indonesia, that the state of transport infrastructure of any nation gives an indication of the level of development of the nation and a good transportation network is essential for the economic and social development of any nation. This means that many socio- economic activities depend on availability of good networks of roads, railways, waterways, etc. and these infrastructures must be monitored and the documents (map) depicting them also frequently revised and updated.