Integrated topographic, photometric and spectral analysis of the lunar surface: Application to impact melt flows and ponds

Wöhler, Christian; Grumpe, A.; Berezhnoy, A. A.; Bhatt, Megha; Mall, U.

doi:10.1016/j.icarus.2014.03.010

Cited by 42 publications

(33 citation statements)

References 57 publications

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“…Shaded high-resolution DEM constructed using the shape-from-shading approach by and Grumpe and Wöhler (2015), combining GLD100 stereo data (Scholten et al, 2012) with LROC NAC reflectance data. To illustrate elemental abundance mapping on the Moon, we used the approach of Wöhler et al (2014) and Bhatt et al (2015) described in Section 2.1, which relies on a combined analysis of M³ and LP GRS data. Figure 7 depicts the lunar Ti distribution as a latitudinal density plot derived from a nearly global Ti abundance map obtained using the method proposed by Bhatt et al (2015).…”

Section: Example Resultsmentioning

confidence: 99%

“…A framework for the topographic and thermal correction of M³ hyperspectral image data and their normalization to a standard observation and illumination geometry is described in Wöhler et al (2014), which can be used to routinely construct maps of the spectral reflectance, of the topography and of spectral parameters characterizing the absorption features near 1 and 2 µm related to pyroxene (Bhatt et al, 2012) for arbitrary lunar regions. In combination with elemental abundance maps of low resolution e.g.…”

Section: Remote Sensing Methods To Be Appliedmentioning

confidence: 99%

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KOREAN LUNAR LANDER – CONCEPT STUDY FOR LANDING-SITE SELECTION FOR LUNAR RESOURCE EXPLORATION

Kim¹,

Wöhler²,

Ju³

et al. 2016

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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ABSTRACT:As part of the national space promotion plan and presidential national agendas South Korea's institutes and agencies under the auspices of the Ministry of Science, Information and Communication Technology and Future Planning (MSIP) are currently developing a lunar mission package expected to reach Moon in 2020. While the officially approved Korean Pathfinder Lunar Orbiter (KPLO) is aimed at demonstrating technologies and monitoring the lunar environment from orbit, a lander -currently in pre-phase A -is being designed to explore the local geology with a particular focus on the detection and characterization of mineral resources. In addition to scientific and potential resource potentials, the selection of the landing-site will be partly constrained by engineering constraints imposed by payload and spacecraft layout. Given today's accumulated volume and quality of available data returned from the Moon's surface and from orbital observations, an identification of landing sites of potential interest and assessment of potential hazards can be more readily accomplished by generating synoptic snapshots through data integration. In order to achieve such a view on potential landing sites, higher level processing and derivation of data are required, which integrates their spatial context, with detailed topographic and geologic characterizations. We are currently assessing the possibility of using fuzzy c-means clustering algorithms as a way to perform (semi-) automated terrain characterizations of interest. This paper provides information and background on the national lunar lander program, reviews existing approaches -including methods and tools -for landing site analysis and hazard assessment, and discusses concepts to detect and investigate elemental abundances from orbit and the surface. This is achieved by making use of manual, semi-automated as well as fully-automated remote-sensing methods to demonstrate the applicability of analyses. By considering given boundary conditions, concrete procedures for determining potential landing sites of the Korean lunar lander could be proposed.

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Section: Example Resultsmentioning

confidence: 99%

Section: Remote Sensing Methods To Be Appliedmentioning

confidence: 99%

KOREAN LUNAR LANDER – CONCEPT STUDY FOR LANDING-SITE SELECTION FOR LUNAR RESOURCE EXPLORATION

Kim¹,

Wöhler²,

Ju³

et al. 2016

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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“…The M 3 hyperspectral image data cover the wavelength range of 0.42-3.0 µm by 85 spectral bands, where the image resolution in global mode corresponds to 140 m per pixel (Pieters et al, 2009). The method of (Wöhler et al, 2014) was used to estimate the temperature of the lunar surface and subtract the thermal emission component from the spectral radiance. The solar illumination direction and the viewing direction are available on the PDS together with the spectral radiance data.…”

Section: Construction Of Nearly Global Lunar Mineral Abundance Mapsmentioning

confidence: 99%

“…Hence, the mosaic was clustered into 64 spectral classes in an unsupervised manner using a self-organizing map (SOM) (Kohonen, 2001). As features used for SOM clustering the pixel-specific abundances of the elements Fe, Ca, Mg and Ti were used, which were computed for the complete mosaic based on the regression-based algorithm of (Wöhler et al, 2014, Bhatt et al, 2015. To each of the 64 cluster prototype spectra the MPBIL-based spectral unmixing algorithm with a population size of npop = 20 was applied, yielding 64 cluster-specific sets of endmembers.…”

Section: Construction Of Nearly Global Lunar Mineral Abundance Mapsmentioning

confidence: 99%

“…An algorithm for estimating the Fe abundance based on the properties of the also pyroxene-related absorption band near 2 µm has been introduced by (Bhatt et al, 2012) using hyperspectral image data of the Moon Mineralogy Mapper (M 3 ) (Pieters et al, 2009) and SIR-2 point spectrometer (Mall et al, 2009) instruments on the Indian spacecraft Chandrayaan-1. A regression-based approach similar to the one of (Shkuratov et al, 2005) which takes into account a set of spectral parameters describing the 1-µm and 2-µm absorption bands in the M 3 reflectance spectra has been developed for the elements Fe, Ca, Al and Mg (Wöhler et al, 2014). That method was calibrated with * Corresponding author respect to LP GRS elemental abundances.…”

Section: Introductionmentioning

confidence: 99%

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Spectral Unmixing Based Construction of Lunar Mineral Abundance Maps

Bernhardt

Grumpe

Wöhler

2017

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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ABSTRACT:In this study we apply a nonlinear spectral unmixing algorithm to a nearly global lunar spectral reflectance mosaic derived from hyperspectral image data acquired by the Moon Mineralogy Mapper (M 3 ) instrument. Corrections for topographic effects and for thermal emission were performed. A set of 19 laboratory-based reflectance spectra of lunar samples published by the Lunar Soil Characterization Consortium (LSCC) were used as a catalog of potential endmember spectra. For a given spectrum, the multi-population population-based incremental learning (MPBIL) algorithm was used to determine the subset of endmembers actually contained in it. However, as the MPBIL algorithm is computationally expensive, it cannot be applied to all pixels of the reflectance mosaic. Hence, the reflectance mosaic was clustered into a set of 64 prototype spectra, and the MPBIL algorithm was applied to each prototype spectrum. Each pixel of the mosaic was assigned to the most similar prototype, and the set of endmembers previously determined for that prototype was used for pixel-wise nonlinear spectral unmixing using the Hapke model, implemented as linear unmixing of the singlescattering albedo spectrum. This procedure yields maps of the fractional abundances of the 19 endmembers. Based on the known modal abundances of a variety of mineral species in the LSCC samples, a conversion from endmember abundances to mineral abundances was performed. We present maps of the fractional abundances of plagioclase, pyroxene and olivine and compare our results with previously published lunar mineral abundance maps.

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Thermal and near‐infrared analyses of central peaks of Martian impact craters: Evidence for a heterogeneous Martian crust

2015

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Central peaks of impact craters contain materials exhumed from depth, and therefore, investigation of these materials provides clues to subsurface geology and mineralogy. A global spectral survey of central peaks of Martian impact craters between 10 and 200 km diameter was completed using Mars Odyssey Thermal Emission Imaging System (THEMIS) data. Twenty-six central peaks with distinctive spectral signatures from surrounding plains were identified and characterized with thermal infrared and visible/near-infrared data. The distribution of spectrally distinct central peaks (SDCPs) shows some degree of regional clustering, with most craters found in western Noachis Terra, Tyrrhena Terra, within the northern rim of Hellas Basin, and fewer in the northern lowlands. With the exception of four craters in western Noachis Terra, SDCPs contain only one spectrally distinct unit at THEMIS resolution (100 m/pixel). The maximum number of spectrally distinct units observed was three, in Jones and Ostrov craters. The western Noachis Terra SDCPs may expose crustal stratigraphies of multiple igneous compositions or impact materials from Argyre. In the highlands, most SDCP units are consistent with enrichments in olivine or pyroxene relative to surrounding plains, suggesting olivine and pyroxene basaltic lithologies; few are olivine and pyroxene poor. No spatial trend in spectrally derived compositions of SDCPs was observed. Three SDCPs contain THEMIS signatures consistent with high abundances of phyllosilicates, which may contain the most phyllosilicate-rich lithologies found in central peak-associated materials globally.

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Integrated topographic, photometric and spectral analysis of the lunar surface: Application to impact melt flows and ponds

Cited by 42 publications

References 57 publications

KOREAN LUNAR LANDER – CONCEPT STUDY FOR LANDING-SITE SELECTION FOR LUNAR RESOURCE EXPLORATION

KOREAN LUNAR LANDER – CONCEPT STUDY FOR LANDING-SITE SELECTION FOR LUNAR RESOURCE EXPLORATION

Spectral Unmixing Based Construction of Lunar Mineral Abundance Maps

Thermal and near‐infrared analyses of central peaks of Martian impact craters: Evidence for a heterogeneous Martian crust

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Integrated topographic, photometric and spectral analysis of the lunar surface: Application to impact melt flows and ponds

Cited by 42 publications

References 57 publications

KOREAN LUNAR LANDER &ndash; CONCEPT STUDY FOR LANDING-SITE SELECTION FOR LUNAR RESOURCE EXPLORATION

KOREAN LUNAR LANDER &ndash; CONCEPT STUDY FOR LANDING-SITE SELECTION FOR LUNAR RESOURCE EXPLORATION

Spectral Unmixing Based Construction of Lunar Mineral Abundance Maps

Thermal and near‐infrared analyses of central peaks of Martian impact craters: Evidence for a heterogeneous Martian crust

Contact Info

Product

Resources

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KOREAN LUNAR LANDER – CONCEPT STUDY FOR LANDING-SITE SELECTION FOR LUNAR RESOURCE EXPLORATION

KOREAN LUNAR LANDER – CONCEPT STUDY FOR LANDING-SITE SELECTION FOR LUNAR RESOURCE EXPLORATION