What is Earth's polar radius?

Earth's polar radius is the distance from the Earth's center to the mean geographic pole along its rotation axis, used in geodesy and GPS reference ellipsoids.

What is a perch in surveying?

A perch, also known as a rod or pole, is an historic surveying unit equal to 16.5 feet or about 5.0292 metres, common in older land measurement records.

Why convert from Earth's polar radius to perch?

Converting helps interpret large modern geodetic measurements in terms of historical land surveying units found in property and cadastral documents.

How to Convert from Earth's Polar Radius to Perch

Easily convert measurements from Earth's polar radius to perch, an historical length unit used in surveying. Understand the conversion process, uses, and limitations of this unique unit pairing.

Earth's polar radius

Perch

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Earth's polar radius to Perch Conversion Table

Earth's polar radius	Perch

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

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Interval

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

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

Explore More Length Units Converter

What Is This Tool?

This tool converts length values measured in Earth's polar radius to perch, an old surveying unit also known as rod or pole. It is designed for users needing to translate modern geodetic distances into historical land measurement units.

How to Use This Tool?

Enter the value in Earth's polar radius that you want to convert.
Select Earth's polar radius as the from-unit and perch as the to-unit.
Click the convert button to view the result in perch.
Use the converted value for research, mapping, or historical document interpretation.

Key Features

Converts length from Earth's polar radius to perch accurately based on standard definitions.
Supports interpreting old land records and cadastral maps with historical units.
Provides formula and conversion factors for clarity.
Browser-based and easy-to-use interface for quick conversions.

Examples

2 Earth's polar radius converts to 2 × 1263973.7930486 = 2527947.5860972 perch.
0.5 Earth's polar radius converts to 0.5 × 1263973.7930486 = 631986.8965243 perch.

Common Use Cases

Translating large geodetic measurements into historical surveying units found in property deeds.
Integrating modern geodetic data with older cadastral maps and boundary descriptions.
Researching historical estate plans and agricultural records with perch as a unit.

Tips & Best Practices

Verify unit definitions when working with historical records due to regional variations of perch.
Consider the large magnitude of numbers when converting Earth's polar radius to perch.
Use the conversion tool to bridge modern geodetic data with historical land measurement documents.

Limitations

Perch is an obsolete unit no longer in common modern use and varies regionally.
Conversions produce very large values given the Earth's polar radius is a very large distance.
Measurement precision in historical records using perch may differ, so apply conversions cautiously.

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 its rotation axis, used in geodesy and GPS reference ellipsoids.
What is a perch in surveying?: A perch, also known as a rod or pole, is an historic surveying unit equal to 16.5 feet or about 5.0292 metres, common in older land measurement records.
Why convert from Earth's polar radius to perch?: Converting helps interpret large modern geodetic measurements in terms of historical land surveying units found in property and cadastral documents.

Key Terminology

Earth's polar radius: The distance from Earth's center to its mean geographic pole along the rotation axis, representing the semi-minor axis of a reference ellipsoid.
Perch: An historical unit of length used in surveying, equal to 16.5 feet or 5.0292 metres, also known as rod or pole.
Reference ellipsoid: A mathematically defined surface approximating the shape of the Earth used in geodesy and GPS systems.
Cadastral: Relating to the recording of the boundaries and ownership of land parcels.

Quick Knowledge Check

What does Earth's polar radius represent?

Distance from Earth's center to equator

Distance from Earth's center to mean geographic pole

Distance around Earth's equator

Which of the following is an alternate name for perch?

Yard

Rod

Chain

What is a key reason for converting Earth's polar radius to perch?

To find modern GPS coordinates

To understand historical land measurements

To measure time durations

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