Focal Length of Lens given Photo Scale Calculator

✖Photo scale is determined by the focal length of the camera and the flying height above the ground.ⓘ Photo Scale [P]			+10% -10%
✖Flying height of airplane above datum (usually mean sea level) is defined as the average flying height above ground.ⓘ Flying Height of Airplane [H]			+10% -10%
✖Elevation of point, line, or area with respect to datum.ⓘ Elevation of Point [h₁]			+10% -10%

✖Focal Length of Lens is usually represented in millimeters (mm), is the basic description of a photographic lens.ⓘ Focal Length of Lens given Photo Scale [f_len]

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Formula

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Focal Length of Lens given Photo Scale

Formula

`"f"_{"len"} = ("P"*("H"-"h"_{"1"}))`

Example

`"4.2m"=("2.1"*("11m"-"9m"))`

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Focal Length of Lens given Photo Scale Solution

STEP 0: Pre-Calculation Summary

Formula Used

Focal Length of Lens = (Photo Scale*(Flying Height of Airplane-Elevation of Point))
f_len = (P*(H-h₁))
This formula uses 4 Variables

Variables Used

Focal Length of Lens - (Measured in Meter) - Focal Length of Lens is usually represented in millimeters (mm), is the basic description of a photographic lens.
Photo Scale - Photo scale is determined by the focal length of the camera and the flying height above the ground.
Flying Height of Airplane - (Measured in Meter) - Flying height of airplane above datum (usually mean sea level) is defined as the average flying height above ground.
Elevation of Point - (Measured in Meter) - Elevation of point, line, or area with respect to datum.

STEP 1: Convert Input(s) to Base Unit

Photo Scale: 2.1 --> No Conversion Required
Flying Height of Airplane: 11 Meter --> 11 Meter No Conversion Required
Elevation of Point: 9 Meter --> 9 Meter No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

f_len = (P*(H-h₁)) --> (2.1*(11-9))

Evaluating ... ...

f_len = 4.2

STEP 3: Convert Result to Output's Unit

4.2 Meter --> No Conversion Required

FINAL ANSWER

4.2 Meter <-- Focal Length of Lens

(Calculation completed in 00.004 seconds)

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Birsa Institute of Technology (BIT), Sindri

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< 4 Photogrammetry Calculators

Focal Length of Lens given Photo Scale

Go Focal Length of Lens = (Photo Scale*(Flying Height of Airplane-Elevation of Point))

Flying Height of Airplane above Datum

Go Flying Height of Airplane = ((Focal Length of Lens/Photo Scale)+Elevation of Point)

Elevation of Point, Line or Area

Go Elevation of Point = (Flying Height of Airplane-(Focal Length of Lens/Photo Scale))

Photo Scale given Focal Length

Go Photo Scale = (Focal Length of Lens/(Flying Height of Airplane-Elevation of Point))

Focal Length of Lens given Photo Scale Formula

Focal Length of Lens = (Photo Scale*(Flying Height of Airplane-Elevation of Point))
f_len = (P*(H-h₁))

What is a Photo Scale in Photogrammetry?

Photo scale in photogrammetry refers to the relationship between the distance on the ground and the corresponding distance on a photograph.

How does Photogrammetry Work?

Photogrammetry works by analyzing photographs of an object or area from multiple angles and using triangulation to calculate the distance and position of each point in the image. This information is then used to create a 3D model or map of the object or area.

How to Calculate Focal Length of Lens given Photo Scale?

Focal Length of Lens given Photo Scale calculator uses Focal Length of Lens = (Photo Scale*(Flying Height of Airplane-Elevation of Point)) to calculate the Focal Length of Lens, The Focal Length of Lens given Photo Scale formula is defined as the distance from the centre of the lens to the principal foci (or focal points) of the lens. Focal Length of Lens is denoted by f_len symbol.

How to calculate Focal Length of Lens given Photo Scale using this online calculator? To use this online calculator for Focal Length of Lens given Photo Scale, enter Photo Scale (P), Flying Height of Airplane (H) & Elevation of Point (h₁) and hit the calculate button. Here is how the Focal Length of Lens given Photo Scale calculation can be explained with given input values -> 4.2 = (2.1*(11-9)).

FAQ

What is Focal Length of Lens given Photo Scale?

The Focal Length of Lens given Photo Scale formula is defined as the distance from the centre of the lens to the principal foci (or focal points) of the lens and is represented as f_len = (P*(H-h₁)) or Focal Length of Lens = (Photo Scale*(Flying Height of Airplane-Elevation of Point)). Photo scale is determined by the focal length of the camera and the flying height above the ground, Flying height of airplane above datum (usually mean sea level) is defined as the average flying height above ground & Elevation of point, line, or area with respect to datum.

How to calculate Focal Length of Lens given Photo Scale?

The Focal Length of Lens given Photo Scale formula is defined as the distance from the centre of the lens to the principal foci (or focal points) of the lens is calculated using Focal Length of Lens = (Photo Scale*(Flying Height of Airplane-Elevation of Point)). To calculate Focal Length of Lens given Photo Scale, you need Photo Scale (P), Flying Height of Airplane (H) & Elevation of Point (h₁). With our tool, you need to enter the respective value for Photo Scale, Flying Height of Airplane & Elevation of Point and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

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