science

Nummela Standard Baseline

Nummela Standard Baseline 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 Nummela Standard Baseline rather than just read about it. In short: Nummela Standard Baseline is a baseline used to calibrate rangefinders, in Finland, located in the municipality of Vihti, Nummelanharju (esker) where it was built in 1932. Winding ridge of stratified gravel and sand was chosen as a location for measurements since temperature variations cause very little displacement on soil where benchmarks are located.

Key takeaways

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

Reference excerpt

Nummela Standard Baseline is a baseline used to calibrate rangefinders, in Finland, located in the municipality of Vihti, Nummelanharju (esker) where it was built in 1932. Winding ridge of stratified gravel and sand was chosen as a location for measurements since temperature variations cause very little displacement on soil where benchmarks are located. Measurement devices such as theodolite and mirrors are then placed on those pillars. Careful preliminary measurements such as levelling height differences of observation pillars reference points are required before actual measurements can begin. In 1947, a white light interference based measurement system was taken to use. It was developed by Yrjö Väisälä. Before that baseline was defined by quartz made measuring rod, which was used to calibrate 24-meter long invar-wire. Standard baselines length is invar-wire multiplied by 36, which is 864 meters. Measured numerical value for the 2007 standard baseline is 864 122.86 millimetres ±0.002 mm to ±0.007 mm uncertainty. 864 122.86 mm ≈ 864 m. Previously used quartz rod had 0.1 mm deviation from 1 meter – intended length – and it was taken account in new measurements. Because of accuracy, curvature of earth had to take in account when building the baseline: the middlepoint 432 m is 14.6 mm lower than zero & 864 -points. (Fig 17 in ref "144" )

References

External links Nummela Standard Baseline – The Finnish Geospatial Research Institute MIKES and Finnish Geodetic Institute perform the most accurate geodetic baseline measurements in the world

Illustrations

Worked examples

Example 1 — a first encounter with Nummela Standard Baseline

Start with the simplest possible case. Write down what Nummela Standard Baseline 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 Nummela Standard Baseline 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 Nummela Standard Baseline 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 Nummela Standard Baseline

In research: Nummela Standard Baseline 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 Nummela Standard Baseline 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: Nummela Standard Baseline is common in secondary-school and first-year university syllabi. It links to neighbouring topics Geodesy stubs, Geodetic surveys, Geography of Uusimaa, so understanding it makes those chapters shorter.
In everyday life: Look for Nummela Standard Baseline 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 “Nummela Standard Baseline” →

Affiliate

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

How to study Nummela Standard Baseline in 20 minutes

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

Frequently asked questions

What is Nummela Standard Baseline in simple terms?

Why does Nummela Standard Baseline 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 Nummela Standard Baseline?

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 Nummela Standard Baseline.