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Global Navigation Grid Code

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The Global Navigation Grid Code (GNGC) is a Chinese developed point reference system commonly designed for global navigation. It is similar in design to the national grid reference systems used throughout the world. GNGC was developed and based upon the work of the GeoSOT team headquartered in the Institute of Remote Sensing and GIS, Peking University. The concept for this system was first proposed in 2015 in Bin Li's dissertation: Navigation Computing Model of Global Navigation Grid Code.[1]

Main Function

This coding model offers solutions to problems relating to navigation and positioning and shares important spatial information to others on the grid.

Background Information

From 2009-2013 a research team (the Institute of Remote Sensing and GIS School of Earth and Space Science located at Peking University), in conjunction with Wuhan University, Information Engineering University, Chinese University of Science and Technology, National University of Defense Technology, completed the National 973 Project: "Global Spatial Information Subdivision Theory and Application Method". As a result of this combined effort, the team proposed a global subdivision grid frame: Geographic Coordinate Subdivision Grid With One Dimension Integer Coding on 2n Tree (GeoSOT). This work primarily solved the three scientific problems with regards to spatial data organization : basic frame, location code and presentation model.

GeoSOT, more simply put, is a grid system that originates from a center point on earth and climbs to another point 50000 km in space. It subdivides the earth space by 32 levels into millions of small grids a centimeter apiece in size. The culmination of this work resulted in a total of 28 patents being applied for and the results of the project are published in a work entitled: Introduction to Spatial Information Subdivision.[2] Additionally, the team proposed a complete area location coding system called "1+4 basic code, N serial extended codes".[3] Above these codes, the global subdivision grid code is a basic one and it has already been completed.

Research background

Global navigation grid code is part of research on Global Sub-division Grid (GSG). GSG is also called global discrete grid, a reference grid system by subdividing the earth surface into small pieces of grid cells by certain rules(also called geographic grid or spatial information grid). The research of GSG contains the methods of how to subdivide the earth(or earth surface) to the grid cells with same area and same shape of different levels. Through further research on mathematic modeling and algorithm, GSG improves the proficiency on the spatial information presentation and data organization. Today, with the progress in mathematic tool and computer science and technology, global sub-division grid is one of the key method in the research of Geo-information Science.[4]

Global Subdivision grid has a lot of potential applications and has been applied in some fields. For example, the expression of complex geographical phenomena can be studied in complex geological problems. For the expression of natural and human data, the problem of human society can be studied. For the expression of the function and behavior of the geographical system, the relationship between human and land can be studied. With the development of modern technology, the method of earth observing has been developed by leaps and bounds, thus promoting the application of GSG. The role of GSG has evolved from the traditional map location framework and the expression of geographical phenomena to a new level. Main applications include the new application of geographic spatial data fusion, multi-source data fusion, geo-science comprehensive analysis and so on.

In China on the basis of the actual situation of their own, Chinese research team in Peking University designed GNGC that conforms to the habit of Chinese country industry application, easy to calculation of space and spatial index, and can be further extended to the global use of navigation mesh coding. It is necessary and this demand is to replace foreign trellis coded. With the establishment and improvement of the Beidou navigation system, to develop a new navigation grid code with independent intellectual property rights, globally applicable standards and global navigation trellis coded has important strategic significance. It can rise to the height of the China will. Due to the natural advantage of the global partition model in spatial location, it is feasible to build the global grid and design the grid and its coding for navigation applications based on the earth subdivision model.[5]

Functions

A global navigation grid code has multiple applications. It can mark one's location, identify meeting locations, and position elements on a grid. The truing number coding design can greatly simplify the location area identification, expression and calculation.

The idea was born out of the notion that navigation coding methods demands will increase with time and demand more a powerful code system [6].

References

  1. ^ Bin Li.Navigation Computing Model of Global Navigation Grid Code[D].Peking University，2015.
  2. ^ [1]
  3. ^ http://www.coe.pku.edu.cn/research-news/3636
  4. ^ http://mt.sohu.com/20160420/n445218069.shtml
  5. ^ http://www.xyz3d.net/col.jsp?id=108
  6. ^ http://www.point3d.net/nd.jsp?id=65&_np=4_11
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