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# Supplemental material for "Revealing active Mars with HiRISE digital terrain models"

Preferred citation (DataCite format):

  Sutton, Sarah S; Chojnacki, Matthew; McEwen, Alfred; Kirk, Randolph L.; Dundas, Colin; Schaefer, Ethan; et al. (2022).
  Supplemental material for "Revealing active Mars with HiRISE digital terrain models".
  University of Arizona Research Data Repository.
  Media. https://doi.org/10.25422/azu.data.19555210


Corresponding Author:
  Sarah S Sutton, Lunar and Planetary Laboratory, ssutton@lpl.arizona.edu


License:
  CC BY 4.0


DOI:
  https://doi.org/10.25422/azu.data.19555210



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## Summary

Animated gifs showing active surface processes on Mars using time series
generated from orthorectified images from the High Resolution Imaging Science
Experiment (HiRISE) on the Mars Reconnaissance Orbiter.

These gifs are supplemental material accompanying the paper "Revealing active
Mars with HiRISE digital terrain models" submitted to Remote Sensing.

Animation_1_RSL.gif: An animated HiRISE time-step sequence of recurring slope
lineae (RSL) in Garni crater, Mars (11.51º S, 290.31º E). Note the slumping
event along the south wall during Mars Year 32. See McEwen et al. (2013) and
Chojnacki et al. (2016) for additional discussion. Sun symbol shows
illumination direction for each frame.

Animation_2_Dunes.gif: An animated 3-step sequence of high flux ripples,
megaripples, and dunes adjacent to the north polar cap boundary (83.99º N,
233.22º E) using HiRISE orthoimages. See for Diniega et al. (2017) and
Chojnacki et al. (2021) for additional discussion. Sun symbol shows
illumination direction for each frame.

References:

Chojnacki, M.; McEwen, A.; Dundas, C.; Ojha, L.; Urso, A.; Sutton, S. Geologic
context of recurring slope lineae in Melas and Coprates Chasmata, Mars.
_Journal of Geophysical Research: Planets_ **2016** , _121_ , 1204–1231.
doi:10.1002/2015JE004991.

Chojnacki, M.; Vaz, D.A.; Silvestro, S.; Silva, D.C.A. Widespread Megaripple
Activity Across the North Polar Ergs of Mars. _Journal of Geophysical
Research: Planets_ **2021** , _126_ , 1–19. doi:10.1029/2021je006970.

Diniega, S.; Kreslavsky, M.; Radebaugh, J.; Silvestro, S.; Telfer, M.; Tirsch,
D. Our evolving understanding of aeolian bedforms, based on observation of
dunes on different worlds. _Aeolian Research_ **2017** , _26_ , 5–27.
doi:10.1016/j.aeolia.2016.10.001.

McEwen, A.S.; Dundas, C.M.; Mattson, S.S.; Toigo, A.D.; Ojha, L.; Wray, J.J.;
Chojnacki, M.; Byrne, S.; Murchie, S.L.; Thomas, N. Recurring slope lineae in
equatorial regions of Mars. _Nature Geoscience_ **2013** , _7_ , 53–58.
doi:10.1038/ngeo2014.



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## Files and Folders

Animation_1_RSL.gif: Animated gif created from a detailed area of a time series of 26 HiRISE orthorectified images. The scene is of Garni crater, Mars, located at (11.51º S, 290.31º E). Annotations indicate image ID, Mars Year and solar longitude (Ls), north arrow, solar illumination direction, scale bar and image credit. 

Animation_2_Dunes.gif: Animated gif created from a detailed area of a time series of three HiRISE orthorectified images. The scene is of dunes adjacent to the north polar cap boundary on Mars (83.99º N, 233.22º E). Annotations indicate image ID, Mars Year and solar longitude (Ls), north arrow, solar illumination direction, scale bar and image credit. 



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## Materials & Methods

These animated gifs were created using publicly available HiRISE data (uahirise.org/dtm). The software used to generate the animations is internal to the HiRISE team because it queries the HiRISE database to extract selected sub-areas of images, but the script uses the freely available ImageMagick software to create the annotations and compile the animation.

Any image viewer or browser that can display animated gifs can be used to display these files.



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## Contributor Roles

The roles are defined by the CRediT taxonomy http://credit.niso.org/

  - Sarah S. Sutton, University of Arizona: Data curation, Methodology, Software, Supervision, Validation, Visualization, Writing–original draft.
  - 
  - Matthew Chojnacki, Planetary Science Institute: Investigation, Methodology, Supervision, Validation, Visualization



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## Additional Notes

Links:
  - 10.1002/2015JE004991
  - 10.1029/2021je006970
  - 10.1016/j.aeolia.2016.10.001
  - 10.1038/ngeo2014