The Australian Height Datum (AHD) is Australia’s first and only legal vertical datum, celebrating its 50th anniversary this year. The adjustment of the Australian National Levelling Network (ANLN) in May 1971 provided, for the first time, a nationwide network of physical AHD heights (Roelse et al., 1975).

Volume XVII, Issue 5, May 2021

Assessment of GNSS-based systems for railways safety

Ernst Phillip Mrohs, Sravan Machiraju and Matthias Aichinger-Rosenberger

Australian Height Datum: Celebrating 50 years

Volker Janssen and Simon McElroy

Alexander’s wholeness as the scientific foundation of sustainable urban design and planning

Bin Jiang

My Coordinates

EDITORIAL

News

INDUSTRY | GNSS | GIS | UAV | IMAGING | LBS

Advertisers in this Issue :

GPSat …

As the Covid-19 virus keep surging again and again,
The world rushes to get vaccinated.
And some saw and see opportunities in many ways,
There are many, who contributed to the crisis,
There are few who rival for credits and occupying market share.
Hence, my vaccine is better than yours!
Though the debate is understandable …

S Korea develops autonomous UAV navigation technology
Agency for Defense Development (ADD) controlled by the Defense Ministry, South Korea, through a four-year project, has developed an autonomous navigation technology for drones. The technology allows UAVs to autonomously set an optimized and safe path to their destination. It uses a sensor to collect external information and …

Hexagon partnerships with Fatigue Science
Hexagon’s Mining division has partnered with Fatigue Science, a leader in fatigue and performance predictive analytics and fatigue management information systems. Combined with its real-time operator alertness and collision avoidance solutions, Hexagon will now be able to help customers further protect and optimize their people and equipment with Fatigue Science’s …

Raytheon gets $228 million contract extension for GPS ground system
Raytheon received a $228 million contract to continue development of a ground system for GPS satellites, the Space Force’s Space and Missile Systems Center announced April 30. The contract is for work on the operational control system for the newest version of GPS 3 satellites made …

Freestyle 2 handheld scanner for construction by FARO
FARO Technologies, Inc., recently released the Freestyle 2 Handheld Scanner for Construction. This fast, portable, and targeted 3D data capture device can scan even the tightest spaces more easily than ever. For the construction industry, accurate dimensions and locations are needed when coordinating with scope done earlier …

EGNOS and Galileo on the ambitious Digital Rail agenda
The European Year of Rail brings attention to a number of topics important for improving the role of rail within the EU transport ecosystem. The recently published Policy paper “Challenges for European rail – getting solutions on track” by Jacques Delors Institute, highlights the main challenges …

NavVis IVION Core
NavVis, an innovator in mobile mapping and reality capture launched of NavVis IVION Core.
Previously known as NavVis IndoorViewer, NavVis IVION Core is a reality capture platform where you can manage your 3D scans with intuitive tools for creation, collaboration, and publication. NavVis IVION Core makes mobile mapping workflows more efficient, speeds …

As Christopher Alexander conceived and defined through his life’s work – The Nature of Order – wholeness is a recursive structure that recurs in space and matter and is reflected in human minds and cognition. Based on the definition of wholeness, a mathematical model of wholeness, together with its topological representation…