Clementine imagery: selenographic coverage for cartographic and scientific use

Cook, A. C.; Oberst, J.; Roatsch, Thomas; Jaumann, R.; Acton, C. H.

doi:10.1016/s0032-0633(96)00061-x

Cited by 35 publications

(24 citation statements)

References 6 publications

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“…In Figure 8 we compare the separate azimuth and incidence criteria of Cook et al (1996) and Kirk (1999a) to the bound STD < 0.6 (Becker et al, 2015) and the looser bound STD < 4 for increasing incidence suggested by Fig. 7.…”

Section: Effect Of Mismatched Illuminationmentioning

confidence: 98%

“…Some of these consist of separate bounds on azimuth and incidence differences. For example, Cook et al (1996) imposed an upper limit of 45° sun azimuth difference when selecting candidate stereopairs from the Clementine mission to the Moon. Kirk et al (1999a) pointed out that illumination differences would have less effect at lower incidence angles and relaxed this limit for pairs with i < 60° and further for i < 30°.…”

Section: Effect Of Mismatched Illuminationmentioning

confidence: 99%

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The Effect of Illumination on Stereo DTM Quality: Simulations in Support of Europa Exploration

Kirk¹,

Howington-Kraus²,

Hare³

et al. 2016

ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci.

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ABSTRACT:We have investigated how the quality of stereoscopically measured topography degrades with varying illumination, in particular the ranges of incidence angles and illumination differences over which useful digital topographic models (DTMs) can be recovered. Our approach is to make high-fidelity simulated image pairs of known topography and compare DTMs from stereoanalysis of these images with the input data. Well-known rules of thumb for horizontal resolution (>3-5 pixels) and matching precision (~0.2-0.3 pixels) are generally confirmed, but the best achievable resolution at high incidence angles is ~15 pixels, probably as a result of smoothing internal to the matching algorithm. Single-pass stereo imaging of Europa is likely to yield DTMs of consistent (optimal) quality for all incidence angles ≤85°, and certainly for incidence angles between 40° and 85°. Simulations with pairs of images in which the illumination is not consistent support the utility of shadow tip distance (STD) as a measure of illumination difference, but also suggest new and simpler criteria for evaluating the suitability of stereopairs based on illumination geometry. Our study was motivated by the needs of a mission to Europa, but the approach and (to first order) the results described here are relevant to a wide range of planetary investigations.

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Section: Effect Of Mismatched Illuminationmentioning

confidence: 98%

Section: Effect Of Mismatched Illuminationmentioning

confidence: 99%

The Effect of Illumination on Stereo DTM Quality: Simulations in Support of Europa Exploration

Kirk¹,

Howington-Kraus²,

Hare³

et al. 2016

ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci.

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“…In parallel since 2007, the MRO CTX instrument captures repeat pass single panchromatic grey-scale images at~6m/pixel over a swath-width of 30km with a large number with suitable stereo angles (Cook et al, 1996).…”

Section: Dataset Overviewmentioning

confidence: 99%

“…This would then only identify around one third of all possible stereo-pairs but ensure that stereo-pairs which might contain small pieces of images (i.e. slivers) which might overlap were eliminated (Cook et al, 1996).…”

Section: Defining Non-repeat Stereo Pairsmentioning

confidence: 99%

“…Subsequently, overlapping pairs were examined according to their acquisition setup, following previously reported criteria used to declare a stereo pair (Cook et al, 1996). In particular, the imposed criteria use the following: (a) the 3-dimensional stereo angle between the two images must be larger than 8 ; (b) the incidence angle in both images must be less than 89 ; (c) the incidence angle difference must be less than 10 and (d) the solar longitude (i.e.…”

Section: Defining Non-repeat Stereo Pairsmentioning

confidence: 99%

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Massive stereo-based DTM production for Mars on cloud computers

Tao

Müller

Sidiropoulos

et al. 2018

Planetary and Space Science

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Investigation of Charon's Craters With Abrupt Terminus Ejecta, Comparisons With Other Icy Bodies, and Formation Implications

et al. 2018

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On the moon and other airless bodies, ballistically emplaced ejecta transitions from a thinning, continuous inner deposit to become discontinuous beyond approximately one crater radius from the crater rim and can further break into discrete rays and secondary craters. In contrast, on Mars, ejecta often form continuous, distinct, and sometimes thick deposits that transition to a low ridge or escarpment that may be circular or lobate. The Martian ejecta type has been variously termed pancake, rampart, lobate, or layered, and in this work we refer to it as “abrupt termini” ejecta (ATE). Two main formation mechanisms have been proposed, one requiring interaction of the ejecta with the atmosphere and the other mobilization of near‐surface volatiles. ATE morphologies are also unambiguously seen on Ganymede, Europa, Dione, and Tethys, but they are not as common as on Mars. We have identified up to 38 craters on Charon that show signs of ATE, including possible distal ramparts and lobate margins. These ejecta show morphologic and morphometric similarities with other moons in the solar system, which are a subset of the properties observed on Mars. From comparison of these ejecta on Charon and other solar system bodies, we find the strongest support for subsurface volatile mobilization and ejecta fluidization as the main formation mechanism for the ATE, at least on airless, icy worlds. This conclusion comes from the bodies on which they are found, an apparent preference for certain terrains, and the observation that craters with ATE can be near to similarly sized craters that only have gradational ejecta.

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Clementine imagery: selenographic coverage for cartographic and scientific use

Cited by 35 publications

References 6 publications

The Effect of Illumination on Stereo DTM Quality: Simulations in Support of Europa Exploration

The Effect of Illumination on Stereo DTM Quality: Simulations in Support of Europa Exploration

Massive stereo-based DTM production for Mars on cloud computers

Investigation of Charon's Craters With Abrupt Terminus Ejecta, Comparisons With Other Icy Bodies, and Formation Implications

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