science

Huayi tu

Huayi tu 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 Huayi tu rather than just read about it. In short: The Hua Yi Tu (華夷圖, Map of China and the Barbarian Countries) is a map engraved as a stone stele dated from 1136, around the time of the Song dynasty. It is the earliest surviving map that displays maritime connections between China and other foreign states.

Key takeaways

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

Reference excerpt

The Hua Yi Tu (華夷圖, Map of China and the Barbarian Countries) is a map engraved as a stone stele dated from 1136, around the time of the Song dynasty. It is the earliest surviving map that displays maritime connections between China and other foreign states. The stele is now in the Stele Forest or Beilin Museum (碑林; pinyin: Bēilín) in Xi'an, China.

Features The map measures 79 cm high and 78 cm wide. It depicts mountains, rivers, lakes, as well as more than 400 administrative place names within China. It covers an area bounded in the north by the Great Wall of China, northeast by the present-day Heilongjiang province, extending south to the island of Hainan. At the edges of the map are a few other states such as Korea (Goryeo) on the northeast and India (Tianzhu) on the southwest.

The map of China is surrounded by blocks of texts, which references back to the Tang dynasty map of Jia Dan (scholar and cartographer) called Hainei Huayi Tu (Map of China and the Barbarian Countries within the Seas) presented to Emperor Dezong of Tang in 801. The later Huayi Tu map covers China during the Jin and Southern Song dynasty. The texts arranged around the edges of the map provides information from historical and other sources briefly explaining markers such as the Great Wall, the size of the empire, brief descriptions of Korea, Japan and other foreign states as well as lists of the states to the south and west of China. On the reverse side of the Huayi tu is the gridded Yu Ji Tu (Map of the Tracks of Yu the Great), carved in 1142. This is the earliest surviving example of a lattice cartographic grid found in a Chinese map.

References

External links Chinese cartography website by Qiming Zhou, Hong Kong Baptist University- accessed 2008-03-16 My Old Maps website by Jim Siebold, 2015

Illustrations

Worked examples

Example 1 — a first encounter with Huayi tu

Start with the simplest possible case. Write down what Huayi tu 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 Huayi tu 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 Huayi tu 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 Huayi tu

In research: Huayi tu 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 Huayi tu 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: Huayi tu is common in secondary-school and first-year university syllabi. It links to neighbouring topics Historic maps of Asia, Historic maps of the world, Maps of China, so understanding it makes those chapters shorter.
In everyday life: Look for Huayi tu 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 Huayi tu in 20 minutes

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

Frequently asked questions

What is Huayi tu in simple terms?

Why does Huayi tu 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 Huayi tu?

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 Huayi tu.