Network


Latest external collaboration on country level. Dive into details by clicking on the dots.

Hotspot


Dive into the research topics where Philip A. Davis is active.

Publication


Featured researches published by Philip A. Davis.


Remote Sensing of Environment | 1993

Surficial geology of the Safsaf region, south-central Egypt, derived from remote-sensing and field data

Philip A. Davis; Carol S. Breed; John F. McCauley; Gerald G. Schaber

Abstract We used a decorrelation-stretched image of Landsat Thematic Mapper (TM) Bands 1, 4, and 7 and field data to map and describe the main surficial units in the hyperarid Safsaf region in south-central Egypt. We show that the near-infrared bands on Landsat TM, which are sensitive to very subtle changes in mineralogy common to arid regions, significantly improve the geologists capability to discriminate geologic units in desert regions. These data also provide the spatial and spectral information necessary to determine the migration patterns and provenance of eolian materials. The Safsaf area was the focus of our post flight field studies using Shuttle Imaging Radar (SIR) data following the discovery of buried paleochannels in North Africa. Most of the channels discernible on SIR images are not expressed in TM data, but traces of a few channels are present in both the SIR and the TM data within the Wadi Safsaf area. Here we present a detailed digital examination of the SIR and the TM-band reflectance and reflectance-ratio data at three locations of the more obvious surface expressions of the buried channels. Our results indicate that the TM expressions of the channels are not purely topographic but are more compositional in nature. Two possibilities may account for the TM expressions of the buried channels: 1) concentrations of windblown, iron-rich materials that accumulated along subtle curvilinear topograpohic traps, or 2) curvilinear exposures of an iron-rich underlying unit of the flat sand sheet.


Journal of Geophysical Research | 1988

Tectonic history of the Syria Planum province of Mars

Kenneth L. Tanaka; Philip A. Davis


Journal of Geophysical Research | 1980

Iron and titanium distribution on the moon from orbital gamma ray spectrometry with implications for crustal evolutionary models

Philip A. Davis


Journal of Geophysical Research | 1984

Modeling crater topography and albedo from monoscopic Viking Orbiter images: 1. Methodology

Philip A. Davis; Laurence A. Soderblom


Journal of Geophysical Research | 1986

A chemical and petrological model of the lunar crust and implications for lunar crustal origin

Paul D. Spudis; Philip A. Davis


Open-File Report | 1993

The Venus geologic mappers' handbook

Kenneth L. Tanaka; H.J. Moore; G.G. Shaber; Mary G. Chapman; E.B. Stofan; D.B. Campbell; Philip A. Davis; John E. Guest; G.E. McGill; P.G. Rogers; R.S. Saunders; James R. Zimbelman


Journal of Geophysical Research | 1990

Discontinuities in the shallow Martian crust at Lunae, Syria, and Sinai Plana

Philip A. Davis; Matthew P. Golombek


Journal of Geophysical Research | 1987

Global petrologic variations on the moon: a ternary-diagram approach.

Philip A. Davis; Paul D. Spudis


Icarus | 1995

Topography of closed depressions, scarps, and grabens in the North Tharsis region of Mars: implications for shallow crustal discontinuities and graben formation

Philip A. Davis; Kenneth L. Tanaka; Matthew P. Golombek


Journal of Geophysical Research | 1985

Petrologic province maps of the lunar highlands derived from orbital geochemical data

Philip A. Davis; Paul D. Spudis

Collaboration


Dive into the Philip A. Davis's collaboration.

Top Co-Authors

Avatar

Kenneth L. Tanaka

United States Geological Survey

View shared research outputs
Top Co-Authors

Avatar

Laurence A. Soderblom

United States Geological Survey

View shared research outputs
Top Co-Authors

Avatar

Matthew P. Golombek

United States Geological Survey

View shared research outputs
Top Co-Authors

Avatar

Paul D. Spudis

Lunar and Planetary Institute

View shared research outputs
Top Co-Authors

Avatar

Gerald G. Schaber

United States Geological Survey

View shared research outputs
Top Co-Authors

Avatar

Richard C. Kozak

United States Geological Survey

View shared research outputs
Top Co-Authors

Avatar

Eric M. Eliason

United States Geological Survey

View shared research outputs
Top Co-Authors

Avatar

Carol S. Breed

United States Geological Survey

View shared research outputs
Top Co-Authors

Avatar

D. J. Roddy

United States Geological Survey

View shared research outputs
Top Co-Authors

Avatar

John F. McCauley

Northern Arizona University

View shared research outputs
Researchain Logo
Decentralizing Knowledge