IEEE Geoscience and Remote Sensing Magazine - December 2019 - 60
Correction
In Theiler et al. [1] in the June 2019 issue of IEEE Geoscience and Remote
Sensing Magazine, there were errors, introduced in the production process, in
(15), Figures 2 and 3, and Table 2. The corrected items are printed here. We
apologize for these errors and any confusion they may have caused.
Z
K
] t = / a k e k = Ea
]
[ k=1
(15)
.
]] a <* 0
\1 a =1
Reference
[1] J. Theiler, A. Ziemann, S. Matteoli, and M. Diani, "Spectral variability of remotely
sensed target materials: Causes, models, and strategies for mitigation and robust
exploitation," IEEE Geosci. Remote Sens. Mag, vol. 7, no. 2, pp. 8-30, June 2019.
doi: 10.1109/MGRS.2019.2890997.
TABLE 2. A CATEGORIZATION OF ENVIRONMENTALLY INDUCED SOURCES OF VARIABILITY.
ADJACENT
ENVIRONMENT
SOURCE OF
VARIABILITY
MAINLY
AFFECTED TERMS
SPATIAL
STATIONARITY
TEMPORAL
STATIONARITY
Constituents,
gases, aerosols
Ed (m), Lp (m),
Td (m), Tu (m), S(m)
Stationary over
wide areas*
Seasonal
Clouds, WV
Td (m), Tu (m),
Lp (m), Ed (m), S(m)
Nonstationary
Nonstationary
Adjacent materials
Ladj (m), ra (m)
Nonstationary
Stationary
Nearby objects
and obstacles
Ldif (m), Lobst (m)
Nonstationary
Stationary
Shadows
Ldir (m)
Nonstationary
Hourly variations
Sun position
Esu (m),
Stationary over
wide areas
Hourly variations
Ed (m),
Lobst (m), Ladj (m),
Td (m), Tu (m)
ACQUISITION
GEOMETRY
Topography
Esu (m), Ldif (m),
Lobst (m), Ladj (m)
Nonstationary
Stationary
Sensor viewing
angle
Tu (m), Lp (m)
Stationary**
Stationary
ATMOSPHERE
ILLUMINATION
*Except for wide-imaged areas and situations with extremely wide-angle views or very shallow slant-angled views.
**Except for situations with extremely wide-angle views.
z
Top of Atmosphere
θo
θi
L (θo , φo )
Lp(λ)
Ladj(λ)
Ldif(λ)
Ldir(λ)
Lobst(λ)
E (θi , φi )
y
φi
φo
x
ra (λ)
FIGURE 2. An illustration of the BRDF geometry described in (1).
r (λ)
FIGURE 3. A sketch of the radiative-transfer model along the sun-totarget-to-sensor path, as described in the "Main Radiative-Transfer Model
Equations" section. The individual terms are listed in Table 1.
Digital Object Identifier 10.1109/MGRS.2019.2939893
Date of current version: 18 December 2019
60
GRS
IEEE GEOSCIENCE AND REMOTE SENSING MAGAZINE
DECEMBER 2019
IEEE Geoscience and Remote Sensing Magazine - December 2019
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