What is Earth's polar radius?

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

What is the foot (US survey)?

The foot (US survey) is a length unit used historically by U.S. land surveyors, defined exactly as 1200/3937 meters.

Why convert Earth's polar radius to foot (US survey)?

This conversion helps translate geodetic lengths into units tailored for U.S. surveying, mapping, and engineering projects that require compatibility with historical measurement standards.

How to Convert from Earth's Polar Radius to Foot (US survey) [ft]

Learn how to convert Earth's polar radius values to the foot (US survey) unit using this online length unit converter. Understand the key features and applications for geodetic and surveying contexts.

Earth's polar radius

Foot (US survey) [ft]

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Earth's polar radius to Foot (US survey) [ft] Conversion Table

Earth's polar radius	Foot (US survey) [ft]

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

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Earth's polar radius to Foot (US survey) [ft] Conversion Table
Earth's polar radius	Foot (US survey) [ft]

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What Is This Tool?

This converter allows users to change measurements from Earth's polar radius, a geodetic length representing the distance from Earth's center to the geographic pole, into the foot (US survey), a unit used primarily in U.S. land surveying and mapping.

How to Use This Tool?

Enter the value in Earth's polar radius you want to convert.
Select Earth's polar radius as the original unit and foot (US survey) as the target unit.
Click the convert button to get the measurement in feet (US survey).
Use the results for mapping, surveying, or engineering purposes.

Key Features

Converts Earth's polar radius to foot (US survey) units accurately.
Supports geodetic and surveying applications related to Earth's shape and property boundaries.
Browser-based and easy to use with quick input and conversion.
Includes examples for better understanding of conversion results.

Examples

1 Earth's polar radius equals 20,855,525.874166 feet (US survey).
0.5 Earth's polar radius equals 10,427,762.937083 feet (US survey).

Common Use Cases

Defining geodetic ellipsoid parameters for GPS and mapping systems.
Translating geodetic lengths into units used in U.S. land surveying and cadastral measurements.
Using measurements consistent with legacy State Plane Coordinate Systems.
Supporting engineering and construction projects requiring older survey units.

Tips & Best Practices

Ensure consistent use of WGS84 or other geodetic reference models for accuracy.
Use the foot (US survey) unit specifically for projects related to U.S. surveying standards.
Verify unit compatibility when integrating converted values with international datasets.
Be aware of the scale of Earth's polar radius and its relevance to your project's scope.

Limitations

The foot (US survey) differs slightly from the international foot, which may cause discrepancies outside U.S. contexts.
Earth's polar radius is a large-scale measurement, not suitable for everyday length conversion needs.
Accurate results depend on proper geodetic model use and consistent conversion constants.

Frequently Asked Questions

What is Earth's polar radius?: Earth's polar radius is the distance from Earth's center to the geographic pole along the rotation axis, representing the semi-minor axis of a reference ellipsoid such as WGS84.
What is the foot (US survey)?: The foot (US survey) is a length unit used historically by U.S. land surveyors, defined exactly as 1200/3937 meters.
Why convert Earth's polar radius to foot (US survey)?: This conversion helps translate geodetic lengths into units tailored for U.S. surveying, mapping, and engineering projects that require compatibility with historical measurement standards.

Key Terminology

Earth's polar radius: The distance from Earth's center to the mean geographic pole along the rotation axis, representing the semi-minor axis of a reference ellipsoid like WGS84.
Foot (US survey): A unit of length historically used in U.S. land surveying, defined precisely as 1200/3937 meters.
WGS84: A widely used geodetic reference ellipsoid standard for calculating Earth-related measurements and GPS.

Quick Knowledge Check

What does Earth's polar radius represent?

Distance from Earth's center to equator

Distance from Earth's center to geographic pole

Average radius of Earth

Which unit is defined as exactly 1200/3937 meters?

International foot

Foot (US survey)

Meter

Why is foot (US survey) commonly used in land surveying in the U.S.?

It is easier to convert to metric units

It matches historical and cadastral surveying records

It is a newer international standard

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