JULY 2019  
Overview of marine plastic debris in Vietnam in relation to international context Le Dai Thang | Ionosphere Total Electron Content (TEC) anomaly detection prior to Earthquake using Global Positioning System observation data Gopal Sharma and P L N Raju | PPP: the way ahead for solving land tenure issues and contribute to sustainable development? Daniel Paez | Static Precise Point Positioning (PPP) Using Triple-Constellation GNSS Robert Galatiya S B Suya | Old Coordinates
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LAND ADMINISTRATION

PPP: the way ahead for solving land tenure issues and contribute to sustainable development?
Daniel Paez, PhD
In this article, I propose strategies for practitioners to involve the private sector in land administration services while at the same time ensuring there is a contribution to the achievement of the SDGs. Many of these strategies I have written them after understanding what has worked well (like in Switzerland) and what lessons we have learnt from challenging land PPPS (like in the Philippines)...
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ENVIRONMENT
Overview of marine plastic debris in Vietnam in relation to international context
Le Dai THANG
Vietnam has issued and implemented many strategies, policies and regulations on environmental protection to limit marine plastic debris. It has achieved many encouraging results, but there are still many difficulties ahead.In order to reduce the quantity of plastic entering the ocean, existing management instruments need to be made more effective and all aspects of waste treatment and disposal need to be improved...
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GNSS
Ionosphere TEC anomaly detection prior to Earthquake using GPS observation data
Gopal Sharma And P L N Raju
The study has revealed that Total Electron Content (TEC) may be used as one of the parameter for seismic precursor. The analysis also suggest the degree and distance up to which ionospheric TEC can be exasperated because of the impending earthquake...
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POSITIONING
Static precise point positioning using triple-constellation GNSS
Robert S B Galatiya Suya
This paper evaluates the static PPP solutions using triple-constellation GNSS in seven different modes. The evaluation is done in terms of positioning accuracy, convergence time and Positional Dilution of Precision (PDOP). GNSS observations from seven (7) MGEX stations spread over Africa were analysed for DOY 060 to DOY 066 for year 2017 in GAMP...
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