science

Polyconic projection class

Polyconic projection class 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 Polyconic projection class rather than just read about it. In short: Polyconic can refer either to a class of map projections or to a specific projection known less ambiguously as the American polyconic projection. Polyconic as a class refers to those projections whose parallels are all non-concentric circular arcs, except for a straight equator, and the centers of these circles lie along a central axis.

Key takeaways

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

Reference excerpt

Polyconic can refer either to a class of map projections or to a specific projection known less ambiguously as the American polyconic projection. Polyconic as a class refers to those projections whose parallels are all non-concentric circular arcs, except for a straight equator, and the centers of these circles lie along a central axis. This description applies to projections in equatorial aspect.

Polyconic projections Some of the projections that fall into the polyconic class are:

American polyconic projection—each parallel becomes a circular arc having true scale, the same scale as the central meridian Latitudinally equal-differential polyconic projection Rectangular polyconic projection Van der Grinten projection—projects entire earth into one circle; all meridians and parallels are arcs of circles. Nicolosi globular projection—typically used to project a hemisphere into a circle; all meridians and parallels are arcs of circles. A series of polyconic projections, each in a circle, was also presented by Hans Mauer in 1922, who also presented an equal-area polyconic in 1935. Another series by Georgiy Aleksandrovich Ginzburg appeared starting in 1949. Most polyconic projections, when used to map the entire sphere, produce an "apple-shaped" map of the world. There are many "apple-shaped" projections, almost all of them obscure.

Illustrations

Worked examples

Example 1 — a first encounter with Polyconic projection class

Start with the simplest possible case. Write down what Polyconic projection class 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 Polyconic projection class 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 Polyconic projection class 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 Polyconic projection class

In research: Polyconic projection class 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 Polyconic projection class 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: Polyconic projection class is common in secondary-school and first-year university syllabi. It links to neighbouring topics Cartography stubs, Map projections, so understanding it makes those chapters shorter.
In everyday life: Look for Polyconic projection class 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.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “Polyconic projection class” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Polyconic projection class in 20 minutes

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

Frequently asked questions

What is Polyconic projection class in simple terms?

Why does Polyconic projection class 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 Polyconic projection class?

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 Polyconic projection class.