ACCURACY ASSESSMENT OF SATELLITE POSITIONING DATA� CASE OF ADAMA CITY, ETHIOPIA

Roba Gemechu; Peddada Jagadeeswara Rao; Sridhar Bendalam; Gudikandhula Narasimha Rao

Volume : V, Issue : IX, September - 2016

ACCURACY ASSESSMENT OF SATELLITE POSITIONING DATA� CASE OF ADAMA CITY, ETHIOPIA

Roba Gemechu, Peddada Jagadeeswara Rao, Sridhar Bendalam, Gudikandhula Narasimha Rao

Abstract :

Global positioning system (GPS) is a worldwide satellite positioning system that provides precise location. The aim of assessing the accuracy of GPS coordinate network comprises detection of errors in GPS measurements and adjusting GPS coordinate measurements to the most precise value. In this research GPS data errors were detecting by computing residual errors and root mean square errors. In the process, the precision of measured Northing and Easting coordinates wre computed using standard deviation. The adjustment of GPS coordinates starts with adjustment of reference control base station. In the study the approaches used to adjust reference base station was computing the mean coordinate value of control base station from existing digital master plan data, orthophoto, georeferenced Google earth image and SPOT satellite image. Finally the most precise value of all stations coordinate of GPS network were adjusting from the mean value of the reference control base station using spectrum survey software.