IEEE Geoscience and Remote Sensing Magazine - June 2019 - 72

Longwave
Infrared
Hyperspectral
Imaging
Principles, progress, and challenges

IMAGE LICENSED BY INGRAM PUBLISHING

DIMITRIS MANOLAKIS, MICHAEL PIEPER, ERIC TRUSLOW, RONALD LOCKWOOD,
ANDREW WEISNER, JOHN JACOBSON, AND THOMAS COOLEY

L

ongwave infrared (LWIR) hyperspectral imaging (HSI)
sensors provide valuable information for numerous
military, scientific, and commercial applications. The hyperspectral signal exploitation principles are the same in
the reflective and emissive regions of the spectrum. However, the underlying phenomenology and interaction with
the environment are different in the two regimes of the
spectrum. These differences affect all aspects of thermal
IR HSI, from sensor design to data exploitation. The main
objective of this article is to explain the unique aspects
of thermal IR HSI, review the progress that has been
made, and highlight existing challenges and areas for
future research.

Digital Object Identifier 10.1109/MGRS.2018.2889610
Date of publication: 18 June 2019

72

0274-6638/19©2019IEEE

APPLICATIONS FOR LONGWAVE INFRARED
HYPERSPECTRAL IMAGING
LWIR spectroscopy is the subset of IR spectroscopy that
deals with radiation emitted in the IR part of the electromagnetic (EM) spectrum [1]. The LWIR spectral region extends typically from 8 to 14 nm. Spectral features in the
LWIR enable mineral and soil analysis, estimation of vegetation density and cover type, gas detection and identification, and land surface temperature estimation. The reflective region, where the main source of radiation is the sun,
extends from 0.4 to 2.5 nm. Figure 1 provides a pictorial
illustration of the main IR spectrum regions and their utility in practical applications.
Remotely sensed LWIR data are directly linked to the
emissivity and temperature of the land surface through
the radiative transfer equation. Land surface emissivity
or simply, emissivity, is the signal of interest in HSI data
IEEE GEOSCIENCE AND REMOTE SENSING MAGAZINE

JUNE 2019



IEEE Geoscience and Remote Sensing Magazine - June 2019

Table of Contents for the Digital Edition of IEEE Geoscience and Remote Sensing Magazine - June 2019

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