An Alternative Technique for Mutual Transformation Between the Egyptian Transverse Mercator and the Universal Transverse Mercator Optimum Implementation of the Polynomials In Coordinate Transformation Process Simple Model for Improving the Accuracy of the Geodetic Triangulation Network in Egypt Using Accurate GPS Coordinates Improving the Accuracy of the SRTM Global DEM Using GPS data fusion and regression Model Comparative Study of Satellite Images Performance in Mapping Lake Bathymetry: Case Study of Al-Manzala Lake, Egypt Study the Behavior of Total Least Squares Technique in Adjusting GPS Field Data - A Case Study Evaluation of GOCE Satellite only Models along the River Nile Proposals for Evaluating the Observed Gravity Field Data Performance Evaluation of Applying Fuzzy Multiple Regression Model to TLS in the Geodetic Coordinate Transformation Performance Evaluation of Precise Point Positioning (PPP) Using CSRS-PPP Online Service Estimating Sea Level Change at the Egyptian Coasts Using Different Data Sources