science

Natural Area Code

Natural Area 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 Natural Area Code rather than just read about it. In short: Natural Area Code, also called Universal Address, is a geocode generated by the Natural Area Coding System - a public domain geocode system for identifying an area (also a location when the area is relatively small enough) anywhere on the Earth, or a volume of space anywhere around and inside the Earth. The use of thirty alphanumeric characters instead of only ten digits makes a NAC shorter than its numerical latitu…

Key takeaways

Natural Area 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 Natural Area Code to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Natural Area Code from memory before moving on to harder problems.

Reference excerpt

Natural Area Code, also called Universal Address, is a geocode generated by the Natural Area Coding System - a public domain geocode system for identifying an area (also a location when the area is relatively small enough) anywhere on the Earth, or a volume of space anywhere around and inside the Earth. The use of thirty alphanumeric characters instead of only ten digits makes a NAC shorter than its numerical latitude/longitude equivalent.

Two-dimensional system Instead of numerical longitudes and latitudes, a grid with 30 rows and 30 columns - each cell denoted by the numbers 0-9 and the twenty consonants of the Latin alphabet - is laid over the flattened globe. A NAC cell (or block) can be subdivided repeatedly into smaller NAC grids to yield an arbitrarily small area, subject to the ±1 m limitations of the World Geodetic System (WGS) data of 1984. A NAC represents an area on the Earth—the longer the NAC, the smaller the area (and thereby, location) represented. A ten-character NAC can uniquely specify any building, house, or fixed object in the world. An eight-character NAC specifies an area no larger than 25 metres by 50 metres, while a ten-character NAC cell is no larger than 0.8 metres by 1.6 metres. Using a base 30 positional numeral system, NAC uses an alternate method which excludes vowels and avoids potential confusion between "0" (zero) and "O" (capital "o"), and "1" (one) and "I" (capital "i"):

For example, the ten-character NAC for the centre of the city of Brussels is HBV6R RG77T.

Extension to three dimensions The full NAC system provides a third coordinate: altitude. This coordinate is the arctangent of the altitude, relative to the Earth's radius, and scaled so that the zero point (000...) is at the centre of the Earth, the midpoint (H00...) is the local radius of the geoid, i.e. the Earth's surface, and the endpoint (ZZZ...) is at infinity. For example, the three-dimensional NAC for the centre of Brussels, at ground level, is HBV6R RG77T H0000.

See also Military Grid Reference System Universal Transverse Mercator coordinate system Quadtree Geohash

References

Further reading Rwerekane, Valentin; Ndashimye, Maurice (2017). "Natural Area Coding Based Postcode Scheme" (PDF). International Journal of Computer and Communication Engineering. 6 (3): 161–172. doi:10.17706/IJCCE.2017.6.3.161-172. Retrieved 25 August 2022. Addressing geographic objects of unique location areas (PDF). FernUniversitaet in Hagen. p. 7. Retrieved 25 August 2022. Kemp, Randall B. (24 October 2008). "Revising place-code schemes for humanitarian relief". Proceedings of the American Society for Information Science and Technology. 44 (1): 1–7.

Worked examples

Example 1 — a first encounter with Natural Area Code

Start with the simplest possible case. Write down what Natural Area 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 Natural Area 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 Natural Area 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 Natural Area Code

In research: Natural Area 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 Natural Area 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: Natural Area Code is common in secondary-school and first-year university syllabi. It links to neighbouring topics Geocodes, Geographic coordinate systems, Geographic information systems, so understanding it makes those chapters shorter.
In everyday life: Look for Natural Area 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 Natural Area Code in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Natural Area 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 Natural Area Code out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Natural Area Code in simple terms?

Why does Natural Area 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 Natural Area 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 Natural Area Code.