dc.contributor.author
Walter, Sebastian H. G.
dc.contributor.author
Aye, Klaus-Michael
dc.contributor.author
Jaumann, Ralf
dc.contributor.author
Postberg, Frank
dc.date.accessioned
2024-02-21T10:12:24Z
dc.date.available
2024-02-21T10:12:24Z
dc.identifier.uri
https://refubium.fu-berlin.de/handle/fub188/42461
dc.identifier.uri
http://dx.doi.org/10.17169/refubium-42186
dc.description.abstract
The image data of the Context Camera (CTX) of the Mars Reconnaissance Orbiter require a flat-field correction that is currently available as a plain text file in the Planetary Data System “Calib” folders for all CTX Enhanced Data Record releases or automatically implemented as part of the ctxcal application of the Integrated Software for Images and Spectrometers (ISIS). We noticed (a) differences between these two flat-fields and (b) residual edge darkening (vignetting) after applying ctxcal. This work examines in detail the edge-darkening effect over time and creates a new improved flat-field calibration file to be implemented into the ISIS ctxcal application as a new default. We introduce a method to quantify the vignetting effect and its residuals after regular ISIS calibration. With the old calibration, the amount of residual edge-darkening is about eight percent. We prove that the new calibration does remove the effect completely, does not introduce any artifacts and qualitatively and quantitatively validate newly calibrated images. Mosaics produced with images that have been calibrated with our new flatfield show immediately less striping issues, without the application of any standard mosaicking-related tone-matching techniques.
en
dc.format.extent
14 Seiten
dc.rights.uri
https://creativecommons.org/licenses/by/4.0/
dc.subject
context camera (CTX)
en
dc.subject
in-flight calibration
en
dc.subject
edge-darkening
en
dc.subject.ddc
500 Naturwissenschaften und Mathematik::520 Astronomie::520 Astronomie und zugeordnete Wissenschaften
dc.title
Mars Reconnaissance Orbiter Context Camera Updated In-Flight Calibration
dc.type
Wissenschaftlicher Artikel
dcterms.bibliographicCitation.articlenumber
e2023EA003491
dcterms.bibliographicCitation.doi
10.1029/2023EA003491
dcterms.bibliographicCitation.journaltitle
Earth and Space Science
dcterms.bibliographicCitation.number
2
dcterms.bibliographicCitation.volume
11
dcterms.bibliographicCitation.url
https://doi.org/10.1029/2023EA003491
refubium.affiliation
Geowissenschaften
refubium.affiliation.other
Institut für Geologische Wissenschaften / Fachrichtung Planetologie und Fernerkundung
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refubium.funding
DEAL Wiley
refubium.note.author
Die Publikation wurde aus Open Access Publikationsgeldern der Freien Universität Berlin gefördert.
refubium.resourceType.isindependentpub
no
dcterms.accessRights.openaire
open access
dcterms.isPartOf.eissn
2333-5084