Discrimination between road and soil surfaces using CO2 laser reflectances

Ram Mohan Narayanan; Earl D. vonRentzell; Dennis R. Alexander

doi:10.1117/12.137865

21 September 1992 Discrimination between road and soil surfaces using CO₂ laser reflectances

Ram Mohan Narayanan, Earl D. vonRentzell, Dennis R. Alexander

Author Affiliations +

Proceedings Volume 1687, Characterization, Propagation, and Simulation of Sources and Backgrounds II; (1992) https://doi.org/10.1117/12.137865
Event: Aerospace Sensing, 1992, Orlando, FL, United States

Abstract

It is well known that CO₂ laser reflectances of natural surfaces containing certain minerals, notably quartz, feldspar and kaolinite, exhibit differential reflectance features in the 9 - 11 micrometers mid-infrared spectral range. The use of off-normal reflectance ratios using measurements at four CO₂ laser wavelengths to differentiate between various types of soil surfaces has been established. Off-normal reflectance ratios are observed to be relatively independent of incidence angle compared to ratios computed at normal incidence, which makes them suitable for field remote sensing applications. Road surface materials, such as concrete and asphalt, contain large quantities of quartz, and as such exhibit reflectance characteristics similar to soils. Our measurements indicate that it is, nevertheless, possible to discriminate between road and soil surfaces using off-normal reflectance ratios. Discrimination from soil surfaces is better for concrete compared to asphalt.

Citation Download Citation

Ram Mohan Narayanan, Earl D. vonRentzell, and Dennis R. Alexander "Discrimination between road and soil surfaces using CO₂ laser reflectances", Proc. SPIE 1687, Characterization, Propagation, and Simulation of Sources and Backgrounds II, (21 September 1992); https://doi.org/10.1117/12.137865

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