Hapke function
WebSep 1, 2024 · The Hapke model is based on a semi-physical model that uses the analytical solutions of radiative transfer on an asteroidal surface with simple assumptions, coupled … Webincidence, 0° emission angle, and 30° phase angle) using Hapke functions (Hapke 2012 and references therein). Starting from the photometric model parameters presented by Reddy et al. (2015), Hapke light-scattering parameters have been iteratively derived from the Approach, Survey, and HAMO mission phases. Iteration
Hapke function
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WebApr 1, 2011 · Compared with the abovementioned models, the Hapke model has mainly been used in planetary remote sensing, facilitating the characterization of soil hyperspectral bidirectional reflectance... Webthe phase function $ by the well-known relationship ir q = 2 $(a)sln a da, 0 where a is the phase angle. For convenience, we further assume that the single-particle phase function is isotropic, that is, independent of the phase angle, although that assumption is not required. All the necessary equations are given by LB and Hapke (1984). From LB ...
WebThe Hapke function 141 has at least five independent parameters: single- scattering albedo, average macroscopic surface roughness, width of the opposition effect, … WebH-function is used. Default is the simplest (and fastest) formula from the 1981 Hapke paper. H93, when set, will force the use of eqn. 8.57 from the Hapke book (from 1993). Pfn - Specify function to use for P(g) instead of the default constant. The function must be a procedure taking arguments g,a,F,/radians
WebJun 1, 1991 · Here, researchers apply the Hapke function to airborne bidirectional reflectance data collected over three terrestrial surfaces. The objectives of the study were to test the range of natural surfaces that the Hapke model fits and to evaluate model parameters in terms of known surface properties. The data used are multispectral and … WebAug 1, 1991 · The limb darkening varies with the Hapke parameters for macroscopic roughness (θ), the single-scattering albedo (w), and the asymmetry factor of the particle phase function (g). Both of the simpler functions generally provide good matches to the limb darkening described by Hapke's function, but the lunar-Lambert function is …
The Hapke parameters are a set of parameters for an empirical model that is commonly used to describe the directional reflectance properties of the airless regolith surfaces of bodies in the Solar System. The model has been developed by astronomer Bruce Hapke at the University of Pittsburgh. The parameters are:
WebThe empirical photometric function is fitted to the Hapke model over a portion of the visible hemisphere of an idealized planet using the following: INCMIN <= incidence angle <= … otterbox latchWebThe variation in limb darkening with w and g, pronounced for smooth surfaces, is reduced or eliminated when the Hapke parameters are in the range typical of most planetary surfaces; this result simplifies the problem of photoclinometry across … rockwell holidays 2023WebAug 9, 2024 · The variables μ and μ 0 are the cosines of the reflection and incidence angles; g is the phase angle; B(g) is the back-scattering function, which defines the increase in brightness of a rough surface with decreasing phase; P(g) is the single-particle phase function; and the H(μ) is the isotropic scattering function. The main parameter is ω, the … rockwell history