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Lava flow topographic measurements for radar data interpretation
Author(s) -
Campbell Bruce A.,
Garvin James B.
Publication year - 1993
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/93gl00737
Subject(s) - geology , altimeter , remote sensing , radar , backscatter (email) , surface roughness , lava , geodesy , autocorrelation , surface finish , volcano , seismology , physics , materials science , telecommunications , statistics , mathematics , composite material , quantum mechanics , computer science , wireless
Surface topography is of great importance in radar backscattering, but the quantitative interpretation of data collected in the field is still a difficult problem. We present topographic profiles at 25‐cm and 5‐cm horizontal resolution for three sites along a lava flow on Kilauea Volcano, and use these data to illustrate techniques for surface roughness analysis. Height and slope distributions and the height autocorrelation function are evaluated as a function of varying lowpass filter wavelength for the 25‐cm data. Rms slopes are found to increase rapidly with decreasing topographic scale and are typically much higher than those found by modeling of Magellan altimeter data for Venus. A more robust description of the surface roughness appears to be the ratio of rms height to surface height correlation length. For all three sites this parameter falls within the range of values typically found from model fits to Magellan altimeter waveforms. The 5‐cm profile data are used to estimate the effect of small‐scale roughness on quasi‐specular scattering.