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Table 1 Optical parameters of FLIR Zenmuse XT2

From: A new method to reconstruct the 3D ground surface temperature from aerial TIR and visible images: application to the active crater of Aso volcano, Japan

  

XT2\(^{\hbox {a}}\)

XT2\(^{\hbox {b}}\)

  

Visible

TIR

Visible

TIR

Focal length

f

4.109e3

5.467e2

4.086e3

7.844e2

Principal point offset

\(c_{\text{x}}\)

1.408e1

0.0

1.104e1

1.616e0

 

\(c_{\text{y}}\)

2.391e1

0.0

2.594e1

−5.610e0

Distortion parameter

\(k_{1}\)

−4.215e−1

−4.461e−1

−4.166e−1

−3.291e−2

 

\(k_{2}\)

2.523e−1

1.987e−1

2.435e−1

1.799e−1

 

\(k_{3}\)

−1.127e−1

0.0

−1.062e−1

8.342e−1

 

\(p_{1}\)

−6.490e−5

−1.820e−3

8.470e−4

8.364e−5

 

\(p_{2}\)

−8.890e−5

−1.106e−3

7.611e−4

−1.252e−3

  1. \(^{\hbox {a}}\) The XT2 model, whose focus length is 9 mm used for the 2020 survey
  2. \(^{\hbox {b}}\) The XT2 model, whose focus length is 13 mm used for the 2022 survey