IEEE Geoscience and Remote Sensing Magazine - June 2019 - 118

WEIWEI SUN AND QIAN DU

Hyperspectral Band Selection
A review

A

hyperspectral imaging sensor collects detailed spectral responses from ground objects using hundreds of
narrow bands; this technology is used in many real-world
applications. Band selection aims to select a small subset
of hyperspectral bands to remove spectral redundancy and
reduce computational costs while preserving the significant
spectral information of ground objects. In this article, we
review current hyperspectral band selection methods,
which can be classified into six main categories: ranking based, searching based, clustering based, sparsity
based, embedding-learning based, and hybrid-scheme
based. With two widely used hyperspectral data sets,
we illustrate the classification performances of several
popular band selection methods. The challenges and
research directions of hyperspectral band selection are
also discussed.

HSI data increases. In remote sensing applications, collecting
a larger number of training samples is costly, time-consuming, and even impossible. Therefore, it is necessary to develop new dimensionality reduction methods and protocols for
hyperspectral image processing [10]-[12].
Adjacent bands in HSI are highly correlated, and some
spectral bands may not carry discriminant information in

THE NECESSITY OF HYPERSPECTRAL
BAND SELECTION
Due to the advancement of imaging spectrometer
technology, a typical hyperspectral sensor now collects
the spectral reflectance of ground objects on Earth's surface using hundreds of narrow bands [1], [2]. Because
of high spectral resolution, the acquired hyperspectral
imagery (HSI) can better differentiate ground objects
using subtle spectral discrepancies. It greatly benefits
many practical applications, e.g., biophysical parameter retrieval [3], [4], fine classification of complex environments [5], [6], small target detection [7], [8], and
so forth. However, HSI produces a very large volume of
data. For example, the Hyperspectral Infrared Imager
launched by NASA's Jet Propulsion Laboratory (JPL) has
the continuous averaged data rate of 65 Mb/s, which
produces a data volume of 372 Gb/orbit and 5.2 Tb/day
[9]. The resulting high computational cost makes fast onboard processing difficult. Its vast data volume also renders the common image processing algorithms designed
for multispectral imagery ineffective. In particular,
the high dimensionality of HSI data brings about the
"curse of dimensionality" problem, i.e., under a fixed,
small number of training samples, the classification accuracy of HSI data decreases when the dimensionality of
Digital Object Identifier 10.1109/MGRS.2019.2911100
Date of publication: 18 June 2019

118

0274-6638/19©2019IEEE

IEEE GEOSCIENCE AND REMOTE SENSING MAGAZINE

JUNE 2019



IEEE Geoscience and Remote Sensing Magazine - June 2019

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