Comparison of orthometric heights determined by GPS and simple geometric levelling Prof El Hassane SEMLALI, Prof Moulay Mohamed AJERAME, Hind HAMYA, Fouzia EL MARZOUQY
This article highlights the effect of altitude change and baseline length on the differences in orthometric heights between simple geometric leveling and GPS. We
have used several experimental tests on three cases of different topography... [more]
POLICY
“Public good” of geographic information Mukund Rao
This large-scale Public Good of GI must only be encouraged, motivated and further enhanced so that the benefit of GI is available and accessible to every citizen, governance activity and all national development activity. India must not get left behind... [more]
Operating Civil Unmanned Aircraft System in India
Office of the Director General of Civil Aviation, Government of India has issued draft Guidelines for obtaining Unique Identification Number (UIN) and Operation of Civil Unmanned Aircraft System (UAS). Coordinates invites comments on this at talktous@mycoordinates.org... [more]
NAVIGATION
Selection of Suitable Matching Area in Gravity-Aided Inertial Navigation System DanMei PENG, Cuijun DONG
This paper utilizes the Principal Component Analysis (PCA) to integrate gravity fi eld’s local standard deviation, roughness, slope and correlation coeffi cients into one singular weighing indicator for the matching suitability of gravity fi eld, which can synthesize different information of different gravity field’s characteristic with the original information lost within the allowable range... [more]
CADASTRE
Cadastre and Land Register Maintenance in Finland Ari Tella
Maintenance of LIS needs several software and auxiliary systems to work well. The LIS is complex combination of systems consisting of a number of subsystems, which all have to work together... [more]
GNSS 