A Test on the Potential of a Low Cost Unmanned Aerial Vehicle RTK/PPK Solution for Precision Positioning.

This paper investigated the achievable accuracy from a low-cost RTK (Real Time Kinematic)/PPK (Post Processing Kinematic) GNSS (Global Navigation Satellite Systems) system installed on board a UAV (Unmanned Aerial Vehicle), employing three different types of GNSS Bases (Alloy, RS2 and RING) working in PPK mode. To evaluate the quality of the results, a set of seven GCPs (Ground Control Points) measured by means of the NRTK (Network Real Time Kinematic) technique was used. The outcomes show a RMSE (Root Mean Square Error) of 0.

HIV disease surveillance. Collaboration between medicine and public health.

Public Health Surveillance is critical to the management of programs designed to control the epidemic of HIV-AIDS. Surveillance defines changing trends, helps to formulate preventive initiatives and evaluate their effectiveness, and to allocate resources. Collaboration between clinical medicine and public health is essential to achieve reliable surveillance.