science

Global Navigation Grid Code

Global Navigation Grid Code is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Global Navigation Grid Code rather than just read about it. In short: The Global Navigation Grid Code (GNGC) is a Chinese-developed point reference system designed for global navigation. It is similar in design to national grid reference systems used throughout the world.

Key takeaways

Global Navigation Grid Code belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Global Navigation Grid Code to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Global Navigation Grid Code from memory before moving on to harder problems.

Reference excerpt

The Global Navigation Grid Code (GNGC) is a Chinese-developed point reference system designed for global navigation. It is similar in design to national grid reference systems used throughout the world. GNGC was 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 proposed in 2015 in Bin Li's dissertation: Navigation Computing Model of Global Navigation Grid Code. GNGC allows easy calculation of space and spatial indexes and can be extended to the provide navigation mesh coding. Along with the Beidou navigation system, GNGC provides independent intellectual property rights, globally applicable standards and global navigation trellis code.

History 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 effort, the team proposed a global subdivision grid frame: Geographic Coordinate Subdivision Grid With One Dimension Integer Coding on 2n Tree (GeoSOT). This work solved the three scientific problems with regards to spatial data organization: basic frame, location code and presentation model. This work resulted in 28 patent applications. The results of the project were published in a work entitled: Introduction to Spatial Information Subdivision.

Design GeoSOT, is a grid system that originates from a center point on Earth and climbs to another point at 50,000 km altitude. It subdivides the earth according to 32 levels into millions of grids 1 cm2 in size. The team proposed a complete area location coding system called "1+4 basic code, N serial extended codes". Above these codes, the global subdivision grid code is a basic one and it has been completed. GNGC is part of research on Global Sub-division Grid (GSG, or global discrete grid, geographic grid or spatial information grid). It subdivides the Earth's surface into small cells. The research of GSG covers the methods of how to subdivide the Earth into cells of equal size and shape at different levels. GSG improves the proficiency of the spatial information presentation and data organization. GSG is one of the key methods in geo-information science.

Applications Main applications include geographic spatial data fusion, multi-source data fusion and geo-science comprehensive analysis. It can mark location and position elements on a grid. The truing number coding design can simplify location area identification, expression and calculation.

Worked examples

Example 1 — a first encounter with Global Navigation Grid Code

Start with the simplest possible case. Write down what Global Navigation Grid Code claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Global Navigation Grid Code before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Global Navigation Grid Code ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Global Navigation Grid Code

In research: Global Navigation Grid Code appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Global Navigation Grid Code in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Global Navigation Grid Code is common in secondary-school and first-year university syllabi. It links to neighbouring topics Geographic coordinate systems, so understanding it makes those chapters shorter.
In everyday life: Look for Global Navigation Grid Code outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Global Navigation Grid Code in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Global Navigation Grid Code means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Global Navigation Grid Code out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Global Navigation Grid Code in simple terms?

Why does Global Navigation Grid Code matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Global Navigation Grid Code?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Global Navigation Grid Code.