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| Titel |
Insights from the correlation of the preliminary Geologic and Mineralogic maps of Vesta from the Dawn mission data |
| VerfasserIn |
A. Frigeri, M. C. De Sanctis, E. Ammannito, R. A. Yingst, S. Mest, B. Garry, G. Magni, E. Palomba, N. Petro, F. Tosi, D. Williams, F. Zambon, R. Jaumann  , C. M. Pieters, C. A. Raymond, C. T. Russell |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250062808
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| Zusammenfassung |
| The Dawn mission to Vesta has greatly improved the quality and resolution of data available
to explore the asteroid. Prior to the Dawn mission the best data available was the one from
Hubble Space Telescope with a maximum resolution of 50 km per pixel. The survey phase of
the mission has pushed spatial resolution up to about 100 meters per pixel by the Framing
Camera on-board Dawn, and 700 meters per pixel for the VIR spectrometer, spanning the
spectral range from the visible to infrared at 0.25–1 μm and 1–5 μm. The frames of the
FC and VIR have been processed and mosaicked. A preliminary Geologic map
has been produced by mapping units and structures over the FC mosaic and the
DTM derived from stereo processing of visible imagery. We will present some
examples of correlation between the preliminary geologic and VIR-derived mineralogic
maps.
The Dawn mission team is using Geographic Information System tools for locating
frames and for data exchange among the team. The use of GIS tools and data formats
significantly improves our ability to create and interpret geologic maps, and also improves the
interoperability of high level data products among the instruments’ team. VIR data have been
synthesized into a series of spectral indicators that give indications on the mineralogical
composition and the physical state of the surface. We ingested in GIS the the preliminary
geologic map as units and structures and we projected the mosaics of spectral indicators in a
common coordinate reference system. The first spectral indicators we started to look at were
the Band Depth computed on pyroxene Band II and the Band Center also computed on Band
II.
The comparison of the preliminary geologic map and the mosaics of spectral indicators
extracted from VIR data show promising aspects on both the geologic and mineralogic
aspects. Geologic units are made up of bodies of rock that are interpreted to have been
formed by a particular process or set of related processes over a discrete interval of time,
so the morphology and the topography are the primary sources for the crafting
of a geologic map. Mineralogy as interpreted from spectroscopy provides unique
information in interpreting unit boundaries and the processes that formed those units. In
particular, spectral indicators synthesize the complex methods of data reduction,
making mineralogic measurements accessible to non-spectroscopists. This way,
within a digital mapping context in GIS, including the spectral indicators in the
stack of imagery and topographic layers enriches the observation possibilities of the
geologic mapper. However, caution must be used to ensure that surface mineralogic
expression are not misinterpreted as geologic units, and only the combined effort of
geologic mappers and spectroscopists will develop good practices in the use of spectral
indicators.
We believe that the combined observation of image mosaics, topography and
mineralogic parameters will greatly improve the interpretative process of geologic
mapping and thus the quality of the next series of forthcoming geologic maps of
Vesta.
The authors gratefully acknowledge the support of the Dawn Instrument, Operations, and Science
Teams. This work is supported by an Italian Space Agency (ASI) grant and by NASA through the Dawn
project and a Dawn at Vesta Participating Scientist grant. |
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