Roger N Clark (Former Employee)
Science and Products
Filter Total Items: 71
Mars' "White Rock" feature lacks evidence of an aqueous origin: Results from Mars Global Surveyor
The “White Rock” feature on Mars has long been viewed as a type example for a Martian playa largely because of its apparent high albedo along with its location in a topographic basin (a crater). Data from the Mars Global Surveyor Thermal Emission Spectrometer (TES) demonstrate that White Rock is not anomalously bright relative to other Martian bright regions, reducing the significance of its albed
Authors
S. W. Ruff, P. R. Christensen, Roger N. Clark, H. H. Kieffer, M. C. Malin, J. L. Bandfield, B. M. Jakosky, M. D. Lane, M. T. Mellon, M. A. Presley
Environmental studies of the World Trade Center area after the September 11, 2001 attack
This web site describes the results of an interdisciplinary environmental characterization of the World Trade Center (WTC) area after September 11, 2001.Information presented in this site was first made available to the World Trade Center emergency response teams on September 18, 2001 (Thermal hot spot information), and September 27, 2001 (maps and compositional results).The Airborne Visible / Inf
Authors
Roger N. Clark, Robert O. Green, Gregg A. Swayze, Greg Meeker, Steve Sutley, Todd M. Hoefen, K. Eric Livo, Geoff Plumlee, Betina Pavri, Chuck Sarture, Steve Wilson, Phil Hageman, Paul Lamothe, J. Sam Vance, Joe Boardman, Isabelle Brownfield, Carol Gent, Laurie C. Morath, Joseph Taggart, Peter M. Theodorakos, Monique Adams
Images of the World Trade Center site show thermal hot spots on September 16 and 23, 2001
No abstract available.
Authors
Roger N. Clark, Robert O. Green, Gregg A. Swayze, Todd M. Hoefen, K. Eric Livo, Betina Pavi, Chuck Sarcher, Joe Boardman, J. Sam Vance
Applications of imaging spectroscopy data: A case study at Summitville, Colorado
From 1985 through 1992, the Summitville open-pit mine produced gold from lowgrade ore using cyanide heap-leach techniques, a method to extract gold whereby the ore pile is sprayed with water containing cyanide, which dissolves the minute gold grains. Environmental problems due to mining activity at Summitville include significant increases in acidic and metal-rich drainage from the site, leakage o
Authors
Trude V.V. King, Roger N. Clark, Gregg A. Swayze
Verification of remotely sensed data
Ground or field checks are an important part of any remote sensing study and are necessary to provide an accurate and useful interpretive product. Field checking is necessary to confirm the validity of spectral, spatial, and morphological interpretations. In general, field checking should be done during all stages of any type of a remote sensing investigation. The methods and magnitude of work nec
Authors
Trude V.V. King, Roger N. Clark
Identification of a basaltic component on the Martian surface from Thermal Emission Spectrometer data
The Mars Global Surveyor Thermal Emission Spectrometer (TES) instrument collected 4.8×106 spectra of Mars during the initial aerobraking and science‐phasing periods of the mission (September 14, 1997, through April 29, 1998). Two previously developed atmosphere‐removal models were applied to data from Cimmeria Terra (25°S, 213°W). The surface spectra derived for these two models agree well, indica
Authors
P. R. Christensen, J. L. Bandfield, M. D. Smith, V.E. Hamilton, Roger N. Clark
Spectroscopy of rocks and minerals and principles of spectroscopy
Spectroscopy is the study of light as a function of wavelength that has been emitted, reflected or scattered from a solid, liquid, or gas. In this chapter I will primarily discuss the spectroscopy of minerals, but the principles apply to any material. No single chapter can cover this topic adequately, and one could argue, not even a single book. Thus, in some ways, this chapter may fall short of e
Authors
Roger N. Clark
Non-water-ice constituents in the surface material of the icy Galilean satellites from the Galileo near-infrared mapping spectrometer investigation
We present evidence for several non‐ice constituents in the surface material of the icy Galilean satellites, using the reflectance spectra returned by the Galileo near infrared mapping spectrometer (NIMS) experiment. Five new absorption features are described at 3.4, 3.88, 4.05, 4.25, and 4.57 μm for Callisto and Ganymede, and some seem to exist for Europa as well. The four absorption bands strong
Authors
T. B. McCord, G. B. Hansen, Roger N. Clark, P. D. Martin, C. A. Hibbitts, F. P. Fanale, J. C. Granahan, M. Segura, D. L. Matson, T. V. Johnson, R. W. Carlson, W. D. Smythe, G. E. Danielson
The distribution of sulfur dioxide and other infrared absorbers on the surface of Io
The Galileo Near Infrared Mapping Spectrometer was used to investigate the distribution and properties of sulfur dioxide over the surface of Io, and qualitative results for the anti‐Jove hemisphere are presented here. SO2, existing as a frost, is found almost everywhere, but with spatially variable concentration. The exceptions are volcanic hot spots, where high surface temperatures promote rapid
Authors
R. W. Carlson, W. D. Smythe, R. M. C. Lopes-Gautier, A.G. Davies, L.W. Kamp, J. A. Mosher, L. A. Soderblom, F.E. Leader, R. Mehlman, Roger N. Clark, F. P. Fanale
Hydrous carbonates on Mars?: Evidence from Mariner 6/7 infrared spectrometer and ground‐based telescopic spectra
Absorption features at 2.28 and 5.4 μm identified in Mariner 6/7 infrared spectrometer and terrestrial telescopic spectra are consistent with the spectra of hydrous magnesium carbonates such as hydromagnesite and artinite. Spectral characteristics of these hydrous carbonates are different from those of the anhydrous carbonates, as the former do not have the strong spectral features typically assoc
Authors
W. M. Calvin, T. V. V. King, Roger N. Clark
The U. S. Geological Survey, Digital Spectral Library: Version 1 (0.2 to 3.0um)
We have developed a digital reflectance spectral library, with management and spectral analysis software. The library includes 498 spectra of 444 samples (some samples include a series of grain sizes) measured from approximately 0.2 to 3.0 um . The spectral resolution (Full Width Half Maximum) of the reflectance data is
Authors
Roger N. Clark, Gregg A. Swayze, Andrea J. Gallagher, Trude V.V. King, Wendy M. Calvin
SPVIEW; spectral plot program for accessing the USGS Digital Spectral Library database with MS-DOS personal computers, version 1.00
No abstract available.
Authors
K. Eric Livo, Roger N. Clark, Daniel H. Knepper
Science and Products
Filter Total Items: 71
Mars' "White Rock" feature lacks evidence of an aqueous origin: Results from Mars Global Surveyor
The “White Rock” feature on Mars has long been viewed as a type example for a Martian playa largely because of its apparent high albedo along with its location in a topographic basin (a crater). Data from the Mars Global Surveyor Thermal Emission Spectrometer (TES) demonstrate that White Rock is not anomalously bright relative to other Martian bright regions, reducing the significance of its albed
Authors
S. W. Ruff, P. R. Christensen, Roger N. Clark, H. H. Kieffer, M. C. Malin, J. L. Bandfield, B. M. Jakosky, M. D. Lane, M. T. Mellon, M. A. Presley
Environmental studies of the World Trade Center area after the September 11, 2001 attack
This web site describes the results of an interdisciplinary environmental characterization of the World Trade Center (WTC) area after September 11, 2001.Information presented in this site was first made available to the World Trade Center emergency response teams on September 18, 2001 (Thermal hot spot information), and September 27, 2001 (maps and compositional results).The Airborne Visible / Inf
Authors
Roger N. Clark, Robert O. Green, Gregg A. Swayze, Greg Meeker, Steve Sutley, Todd M. Hoefen, K. Eric Livo, Geoff Plumlee, Betina Pavri, Chuck Sarture, Steve Wilson, Phil Hageman, Paul Lamothe, J. Sam Vance, Joe Boardman, Isabelle Brownfield, Carol Gent, Laurie C. Morath, Joseph Taggart, Peter M. Theodorakos, Monique Adams
Images of the World Trade Center site show thermal hot spots on September 16 and 23, 2001
No abstract available.
Authors
Roger N. Clark, Robert O. Green, Gregg A. Swayze, Todd M. Hoefen, K. Eric Livo, Betina Pavi, Chuck Sarcher, Joe Boardman, J. Sam Vance
Applications of imaging spectroscopy data: A case study at Summitville, Colorado
From 1985 through 1992, the Summitville open-pit mine produced gold from lowgrade ore using cyanide heap-leach techniques, a method to extract gold whereby the ore pile is sprayed with water containing cyanide, which dissolves the minute gold grains. Environmental problems due to mining activity at Summitville include significant increases in acidic and metal-rich drainage from the site, leakage o
Authors
Trude V.V. King, Roger N. Clark, Gregg A. Swayze
Verification of remotely sensed data
Ground or field checks are an important part of any remote sensing study and are necessary to provide an accurate and useful interpretive product. Field checking is necessary to confirm the validity of spectral, spatial, and morphological interpretations. In general, field checking should be done during all stages of any type of a remote sensing investigation. The methods and magnitude of work nec
Authors
Trude V.V. King, Roger N. Clark
Identification of a basaltic component on the Martian surface from Thermal Emission Spectrometer data
The Mars Global Surveyor Thermal Emission Spectrometer (TES) instrument collected 4.8×106 spectra of Mars during the initial aerobraking and science‐phasing periods of the mission (September 14, 1997, through April 29, 1998). Two previously developed atmosphere‐removal models were applied to data from Cimmeria Terra (25°S, 213°W). The surface spectra derived for these two models agree well, indica
Authors
P. R. Christensen, J. L. Bandfield, M. D. Smith, V.E. Hamilton, Roger N. Clark
Spectroscopy of rocks and minerals and principles of spectroscopy
Spectroscopy is the study of light as a function of wavelength that has been emitted, reflected or scattered from a solid, liquid, or gas. In this chapter I will primarily discuss the spectroscopy of minerals, but the principles apply to any material. No single chapter can cover this topic adequately, and one could argue, not even a single book. Thus, in some ways, this chapter may fall short of e
Authors
Roger N. Clark
Non-water-ice constituents in the surface material of the icy Galilean satellites from the Galileo near-infrared mapping spectrometer investigation
We present evidence for several non‐ice constituents in the surface material of the icy Galilean satellites, using the reflectance spectra returned by the Galileo near infrared mapping spectrometer (NIMS) experiment. Five new absorption features are described at 3.4, 3.88, 4.05, 4.25, and 4.57 μm for Callisto and Ganymede, and some seem to exist for Europa as well. The four absorption bands strong
Authors
T. B. McCord, G. B. Hansen, Roger N. Clark, P. D. Martin, C. A. Hibbitts, F. P. Fanale, J. C. Granahan, M. Segura, D. L. Matson, T. V. Johnson, R. W. Carlson, W. D. Smythe, G. E. Danielson
The distribution of sulfur dioxide and other infrared absorbers on the surface of Io
The Galileo Near Infrared Mapping Spectrometer was used to investigate the distribution and properties of sulfur dioxide over the surface of Io, and qualitative results for the anti‐Jove hemisphere are presented here. SO2, existing as a frost, is found almost everywhere, but with spatially variable concentration. The exceptions are volcanic hot spots, where high surface temperatures promote rapid
Authors
R. W. Carlson, W. D. Smythe, R. M. C. Lopes-Gautier, A.G. Davies, L.W. Kamp, J. A. Mosher, L. A. Soderblom, F.E. Leader, R. Mehlman, Roger N. Clark, F. P. Fanale
Hydrous carbonates on Mars?: Evidence from Mariner 6/7 infrared spectrometer and ground‐based telescopic spectra
Absorption features at 2.28 and 5.4 μm identified in Mariner 6/7 infrared spectrometer and terrestrial telescopic spectra are consistent with the spectra of hydrous magnesium carbonates such as hydromagnesite and artinite. Spectral characteristics of these hydrous carbonates are different from those of the anhydrous carbonates, as the former do not have the strong spectral features typically assoc
Authors
W. M. Calvin, T. V. V. King, Roger N. Clark
The U. S. Geological Survey, Digital Spectral Library: Version 1 (0.2 to 3.0um)
We have developed a digital reflectance spectral library, with management and spectral analysis software. The library includes 498 spectra of 444 samples (some samples include a series of grain sizes) measured from approximately 0.2 to 3.0 um . The spectral resolution (Full Width Half Maximum) of the reflectance data is
Authors
Roger N. Clark, Gregg A. Swayze, Andrea J. Gallagher, Trude V.V. King, Wendy M. Calvin
SPVIEW; spectral plot program for accessing the USGS Digital Spectral Library database with MS-DOS personal computers, version 1.00
No abstract available.
Authors
K. Eric Livo, Roger N. Clark, Daniel H. Knepper