1. Abd-Elmotaal HA (2009) Evaluation of the EGM2008 geopotential model for Egypt. BGI-IGeS Newton’s Bull 4:185–199
2. Abdul-Rahman A, Pilouk M (2008) Spatial data modelling for 3D GIS. Springer, Berlin-Heidelberg
3. Al-Ghamdi KA, Dawod GM (2013) Accuracy assessment of global geopotential models for GIS and geomatics applications in Makkah metropolitan area. The Eighth National GIS Symposium in Saudi Arabia, 15–17 April, 2013
4. Biagi L, Brovelli MA, Salemi G (1998) Geodetic data management with GIS and DBMS techniques. IGeS Bulletin 8:113–126
5. Blitzkow D, Matos AC (2009) EGM2008 and PGM2007A evaluation for South America. BGI-IGeS Newton’s Bull 4: 79–89