Radiance factor calibration of near-infrared spectral images of Mars

David R. Klassen; James F. Bell

doi:10.1016/S0019-1035(03)00044-7

Radiance factor calibration of near-infrared spectral images of Mars

David R. Klassen, James F. Bell

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

We present radiometrically calibrated spectrophotometric images of Mars taken at the NASA Infrared Telescope Facility (IRTF) near and during the 1995 and 1999 oppositions. Absolute intensity and radiance factor (r_F = I/F) values have been calculated for approximately 95% of the surface over all longitudes between -70° to 90° latitude in the 1.5- to 4.1-μm spectral region at a spectral resolution (Δλ/λ) of 1.5%. Values of radiance factor range from r_F = 0.4 to 0.6 at 2.2 μm for the bright regions such as Moab and Arabia to r_F = 0.12 to 0.3 at 2.2 μm around the dark regions Syrtis Major and Acidalia Planitia. Variations are seen due to seasonal dust and/or condensate cloud cover and viewing geometry. Our results are generally consistent with the few reported previous radiance factor determinations for Mars. These data are unique among ground-based data in their relatively high spatial resolution (≲200 km/pixel at the sub-Earth point) and coverage combined with their spectral resolution and coverage. These radiometrically calibrated observations can be used as input to studies focusing on spectral unmixing of surface and atmospheric components, radiative transfer modeling of disk and limb radiances, and photometric modeling of the martian phase function.

Original language	English (US)
Pages (from-to)	66-77
Number of pages	12
Journal	Icarus
Volume	163
Issue number	1
DOIs	https://doi.org/10.1016/S0019-1035(03)00044-7
State	Published - May 1 2003
Externally published	Yes

Keywords

Martian atmosphere
Martian surface
Telescopic observations

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1016/S0019-1035(03)00044-7

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@article{400e0b6869eb4c38801f7ce30218d697,

title = "Radiance factor calibration of near-infrared spectral images of Mars",

abstract = "We present radiometrically calibrated spectrophotometric images of Mars taken at the NASA Infrared Telescope Facility (IRTF) near and during the 1995 and 1999 oppositions. Absolute intensity and radiance factor (rF = I/F) values have been calculated for approximately 95% of the surface over all longitudes between -70° to 90° latitude in the 1.5- to 4.1-μm spectral region at a spectral resolution (Δλ/λ) of 1.5%. Values of radiance factor range from rF = 0.4 to 0.6 at 2.2 μm for the bright regions such as Moab and Arabia to rF = 0.12 to 0.3 at 2.2 μm around the dark regions Syrtis Major and Acidalia Planitia. Variations are seen due to seasonal dust and/or condensate cloud cover and viewing geometry. Our results are generally consistent with the few reported previous radiance factor determinations for Mars. These data are unique among ground-based data in their relatively high spatial resolution (≲200 km/pixel at the sub-Earth point) and coverage combined with their spectral resolution and coverage. These radiometrically calibrated observations can be used as input to studies focusing on spectral unmixing of surface and atmospheric components, radiative transfer modeling of disk and limb radiances, and photometric modeling of the martian phase function.",

keywords = "Martian atmosphere, Martian surface, Telescopic observations",

author = "Klassen, {David R.} and Bell, {James F.}",

note = "Funding Information: We thank the telescope operators, day crew, and support staff of the NASA IRTF, without whom the observations could not have been made. We are especially indebted to Bill Golisch, Dave Griep, and Charlie Kaminski for their many years of help with the acquisition of Mars spectral images from the IRTF. We also thank Cornell students Richard Zentko and Scott Southard for assistance with the data analysis software. Mars cylindrical mapping and some stellar photometry were performed with the help of Rowan students Bill Peppard, Ted Scabarozi, and Brian Fanslau. Much thanks are owed to Michael Wolff and his DISORT “boot camp” and Michael D. Smith and David A. Glenar through the NASA-ASEE fellowship program for their help with atmospheric modeling. This work was supported by grants from the NASA Planetary Astronomy and Planetary Geology Programs.",

year = "2003",

month = may,

day = "1",

doi = "10.1016/S0019-1035(03)00044-7",

language = "English (US)",

volume = "163",

pages = "66--77",

journal = "Icarus",

issn = "0019-1035",

publisher = "Academic Press Inc.",

number = "1",

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TY - JOUR

T1 - Radiance factor calibration of near-infrared spectral images of Mars

AU - Klassen, David R.

AU - Bell, James F.

N1 - Funding Information: We thank the telescope operators, day crew, and support staff of the NASA IRTF, without whom the observations could not have been made. We are especially indebted to Bill Golisch, Dave Griep, and Charlie Kaminski for their many years of help with the acquisition of Mars spectral images from the IRTF. We also thank Cornell students Richard Zentko and Scott Southard for assistance with the data analysis software. Mars cylindrical mapping and some stellar photometry were performed with the help of Rowan students Bill Peppard, Ted Scabarozi, and Brian Fanslau. Much thanks are owed to Michael Wolff and his DISORT “boot camp” and Michael D. Smith and David A. Glenar through the NASA-ASEE fellowship program for their help with atmospheric modeling. This work was supported by grants from the NASA Planetary Astronomy and Planetary Geology Programs.

PY - 2003/5/1

Y1 - 2003/5/1

N2 - We present radiometrically calibrated spectrophotometric images of Mars taken at the NASA Infrared Telescope Facility (IRTF) near and during the 1995 and 1999 oppositions. Absolute intensity and radiance factor (rF = I/F) values have been calculated for approximately 95% of the surface over all longitudes between -70° to 90° latitude in the 1.5- to 4.1-μm spectral region at a spectral resolution (Δλ/λ) of 1.5%. Values of radiance factor range from rF = 0.4 to 0.6 at 2.2 μm for the bright regions such as Moab and Arabia to rF = 0.12 to 0.3 at 2.2 μm around the dark regions Syrtis Major and Acidalia Planitia. Variations are seen due to seasonal dust and/or condensate cloud cover and viewing geometry. Our results are generally consistent with the few reported previous radiance factor determinations for Mars. These data are unique among ground-based data in their relatively high spatial resolution (≲200 km/pixel at the sub-Earth point) and coverage combined with their spectral resolution and coverage. These radiometrically calibrated observations can be used as input to studies focusing on spectral unmixing of surface and atmospheric components, radiative transfer modeling of disk and limb radiances, and photometric modeling of the martian phase function.

AB - We present radiometrically calibrated spectrophotometric images of Mars taken at the NASA Infrared Telescope Facility (IRTF) near and during the 1995 and 1999 oppositions. Absolute intensity and radiance factor (rF = I/F) values have been calculated for approximately 95% of the surface over all longitudes between -70° to 90° latitude in the 1.5- to 4.1-μm spectral region at a spectral resolution (Δλ/λ) of 1.5%. Values of radiance factor range from rF = 0.4 to 0.6 at 2.2 μm for the bright regions such as Moab and Arabia to rF = 0.12 to 0.3 at 2.2 μm around the dark regions Syrtis Major and Acidalia Planitia. Variations are seen due to seasonal dust and/or condensate cloud cover and viewing geometry. Our results are generally consistent with the few reported previous radiance factor determinations for Mars. These data are unique among ground-based data in their relatively high spatial resolution (≲200 km/pixel at the sub-Earth point) and coverage combined with their spectral resolution and coverage. These radiometrically calibrated observations can be used as input to studies focusing on spectral unmixing of surface and atmospheric components, radiative transfer modeling of disk and limb radiances, and photometric modeling of the martian phase function.

KW - Martian atmosphere

KW - Martian surface

KW - Telescopic observations

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U2 - 10.1016/S0019-1035(03)00044-7

DO - 10.1016/S0019-1035(03)00044-7

M3 - Article

AN - SCOPUS:0037505225

SN - 0019-1035

VL - 163

SP - 66

EP - 77

JO - Icarus

JF - Icarus

IS - 1

ER -

Radiance factor calibration of near-infrared spectral images of Mars

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