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Uncertainty in multispectral lidar signals caused by incidence angle effects
Sanna Kaasalainen1, Markku Åkerblom2, Olli Nevalainen3
1Finnish Geospatial Research Institute Institute - FGI, Department of Navigation and Positioning, Geodeetinrinne 2, 02431 Masala, Finland.
Interface Focus
|March 6, 2018
Summary
Multispectral terrestrial laser scanning (TLS) measures vegetation spectral indices with uncertainty. Wavelength-dependent laser incidence angle effects cause systematic errors, impacting vegetation studies.
Area of Science:
- Remote Sensing
- Forestry
- Geospatial Technology
Background:
- Multispectral terrestrial laser scanning (TLS) is an emerging technology, primarily used in research for vegetation studies.
- Commercial multispectral scanners are available for airborne applications, but multispectral TLS is less common.
Purpose of the Study:
- To investigate the uncertainty in measuring vegetation spectral indices using multispectral TLS.
- To identify the sources of systematic errors affecting spectral index measurements.
Main Methods:
- Analysis of spectral index measurements from multispectral TLS data.
- Empirical investigation of wavelength dependency in laser incidence angle effects.
- Review of recent studies on multi-wavelength incidence angle effects and specular reflection.
Main Results:
- Systematic errors in spectral index measurements are caused by wavelength-dependent laser incidence angle effects.
- These errors are empirical and cannot be corrected through standard modeling or instrument adjustments.
- Specular reflection and leaf surface structure significantly influence measurement outcomes.
Conclusions:
- Wavelength-dependent incidence angle effects are a critical source of uncertainty in multispectral TLS vegetation studies.
- Further research is needed to understand and potentially mitigate these effects, possibly through advanced correction schemes like synthetic laser footprints.
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