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Cloud scattering influence on satellite laser altimetry data and its correction.

Xinming Tang, Jiaqi Yao, Guoyuan Li

|May 14, 2020

Summary

This study introduces new methods to correct satellite laser altimetry errors caused by cloud scattering. These techniques improve the accuracy of elevation data, making it more reliable even with atmospheric interference.

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Area of Science:

Earth Observation
Atmospheric Science
Geodesy

Background:

Satellite laser altimetry provides high-resolution surface elevation data.
Atmospheric clouds significantly impact laser altimetry accuracy.
Existing cloud correction methods have limitations due to reliance on simulation parameters.

Purpose of the Study:

To develop and validate methods for correcting cloud scattering errors in satellite laser altimetry data.
To improve the accuracy and availability of altimetry measurements affected by clouds.

Main Methods:

Cloud optical depth inversion using the Fernald method.
Analysis of cloud influence on echo waveform data.
Development of a cloud scattering error correction method based on an exponential model.

Main Results:

The proposed exponential model achieved a root mean square error of 0.05 for cloud optical depths of 0-2.
The correction method can reduce height measurement deviations caused by clouds to within 5 cm.
Improved availability of laser altimetry data impacted by cloud scattering.

Conclusions:

The developed methods effectively correct cloud scattering errors in satellite laser altimetry.
The exponential model offers a practical approach for real-time error correction.
This research enhances the reliability of satellite-based elevation measurements in cloudy conditions.