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GTOPO30

GTOPO30 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 GTOPO30 rather than just read about it. In short: GTOPO30 is a digital elevation model for the world, developed by United States Geological Survey (USGS). It has a 30-arc second resolution (approximately 1 km), and is split into 33 tiles stored in the USGS DEM file format.

GTOPO30 — main illustration
GTOPO30 — illustration

Key takeaways

  • GTOPO30 belongs to science; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect GTOPO30 to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of GTOPO30 from memory before moving on to harder problems.

Reference excerpt

GTOPO30 is a digital elevation model for the world, developed by United States Geological Survey (USGS). It has a 30-arc second resolution (approximately 1 km), and is split into 33 tiles stored in the USGS DEM file format. According to DTED and USGS DEM the absolute vertical accuracy of GTOP30 varies from ±30 meters.

Gallery This map (with 72 tiles) is derived from GTOPO30 data that describes the elevation of Earth's terrain at intervals of 30 arcseconds (approximately 1 km). It uses hypsometric tints instead of contour lines to indicate elevation.

See also Shuttle Radar Topography Mission Advanced Spaceborne Thermal Emission and Reflection Radiometer

References

External links GTOPO30 Page.

Illustrations

GTOPO30 illustration
GTOPO30 illustration
GTOPO30 illustration
GTOPO30 illustration
GTOPO30 illustration

Worked examples

Example 1 — a first encounter with GTOPO30

Start with the simplest possible case. Write down what GTOPO30 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 GTOPO30 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 GTOPO30 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 GTOPO30

In research
GTOPO30 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 GTOPO30 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
GTOPO30 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Cartography stubs, Digital elevation models, so understanding it makes those chapters shorter.
In everyday life
Look for GTOPO30 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 GTOPO30 in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what GTOPO30 means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain GTOPO30 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is GTOPO30 in simple terms?

GTOPO30 is a digital elevation model for the world, developed by United States Geological Survey (USGS). It has a 30-arc second resolution (approximately 1 km), and is split into 33 tiles stored in the USGS DEM file format.

Why does GTOPO30 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 GTOPO30?

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 GTOPO30.

Tags

  • Cartography stubs
  • Digital elevation models

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