What is Earth's polar radius?

Earth's polar radius is the distance from the Earth’s center to the mean geographic pole along the rotation axis, equivalent to the semi-minor axis of a reference ellipsoid such as WGS84.

What is an arpent used for?

An arpent is a historical French unit of length mainly used for land measurement and cadastral purposes, notably in French colonies like Quebec and Louisiana.

Why does the arpent length vary?

The arpent’s exact length differed by historical region and time period, which can cause variances in conversion accuracy.

How to Convert from Earth's Polar Radius to Arpent

Learn how to convert a length measured in Earth's polar radius to arpents, a historical French unit of length used for land measurement.

Earth's polar radius

Arpent

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Earth's polar radius to Arpent Conversion Table

Earth's polar radius	Arpent

Custom Unit Conversion Table Generator – Instant Printable Conversion Tables

Start Value

Enter the starting number (positive decimal or integer ≥ 0). Example: 0.1, 1, 5.

End Value

Enter the ending number (positive decimal or integer > Start Value). Example: 10, 50, 100.

Interval

Enter the step size (positive decimal > 0 and < End Value – Start Value). Example: 1.0, 2.5.

Earth's polar radius to Arpent Conversion Table
Earth's polar radius	Arpent

Explore More Length Units Converter

What Is This Tool?

This converter helps you transform measurements expressed in Earth's polar radius, a geodetic parameter, into arpents, a historic French unit used primarily in land surveying and cadastral contexts.

How to Use This Tool?

Enter the value in Earth's polar radius you wish to convert.
Choose Earth's polar radius as your input unit and arpent as the output unit.
Click the convert button to see your result in arpents.

Key Features

Converts lengths from Earth's polar radius to arpent units.
Useful for historical land measurement and geodetic calculations.
Based on a fixed conversion rate derived from reference ellipsoid parameters.
Supports analysis related to French colonial land records.

Examples

1 Earth's polar radius is equal to 108,622.75 arpents (rounded).
0.5 Earth's polar radius converts to approximately 54,311.37 arpents.

Common Use Cases

Interpreting and converting historical land descriptions recorded in arpents.
Mapping geographic information related to the Earth's ellipsoid shape.
Analyzing satellite orbits and Earth-shape studies referencing geodetic parameters.
Working with cadastral maps in regions influenced by French colonial measurements such as Quebec and Louisiana.

Tips & Best Practices

Ensure you understand the historical context of the arpent unit being used to improve accuracy.
Use this converter primarily for specialized historical or scientific purposes.
Cross-check conversions with historical land records for consistency.
Remember that Earth's polar radius is a fixed measure, while arpent lengths vary by region and period.

Limitations

Arpent lengths varied historically and regionally, which can lead to inconsistent conversions.
Earth's polar radius is a fixed geodetic parameter, while arpent's variable definitions require context for precise use.
This conversion is largely theoretical and specialized, not intended for everyday practical length measurements.

Frequently Asked Questions

What is Earth's polar radius?: Earth's polar radius is the distance from the Earth’s center to the mean geographic pole along the rotation axis, equivalent to the semi-minor axis of a reference ellipsoid such as WGS84.
What is an arpent used for?: An arpent is a historical French unit of length mainly used for land measurement and cadastral purposes, notably in French colonies like Quebec and Louisiana.
Why does the arpent length vary?: The arpent’s exact length differed by historical region and time period, which can cause variances in conversion accuracy.

Key Terminology

Earth's Polar Radius: The distance from the Earth's center to the mean geographic pole along the rotation axis, used as the semi-minor axis in reference ellipsoids.
Arpent: A historical French unit of length used mainly for land and cadastral measurements, varying in exact length by region and era.
WGS84: A widely used reference ellipsoid model defining Earth's shape, including Earth's polar radius.

Quick Knowledge Check

What does Earth's polar radius represent?

Distance from Earth’s equator to pole

Distance from Earth’s center to mean geographic pole

Length of Earth's equatorial radius

In which regions was the arpent primarily used?

French colonies such as Quebec and Louisiana

Ancient Roman territories

Modern European countries only

What is a key limitation when converting arpents?

Arpent lengths have a fixed exact value

Arpent lengths varied by region and period

Earth’s polar radius changes frequently

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