This readme file was generated on 2023-08-29 by Abhinav Jindal GENERAL INFORMATION Title of Dataset: Digital Elevation Model Data from: Measuring Erosional and Depositional Patterns Across Comet 67P's Imhotep Region Author/Principal Investigator Information Name: Abhinav S. Jindal ORCID: https://orcid.org/0000-0002-1158-3446 Institution: Cornell University Address: 424 Space Sciences Building, Sciences Drive, Ithaca, NY 14850 Email: mne8@cornell.edu Author/Associate or Co-investigator Information Name: Samuel P.D. Birch ORCID: https://orcid.org/0000-0002-4578-1694 Institution: Brown University Address: 301 Lincoln Field Building, Brown University, Providence, Rhode Island Email: sambirch@brown.edu Author/Alternate Contact Information Name: Alexander Hayes ORCID: https://orcid.org/0000-0001-6397-2630 Institution: Cornell University Address: 412 Space Sciences Building, Sciences Drive, Ithaca, NY 14850 Email: hayes@astro.cornell.edu Abstract: These files contain the Digital Elevation Model (DEM) data for the results reported in Jindal et al. Measuring Erosional and Depositional Patterns Across Comet 67P's Imhotep Region. In Jindal et al. we found: Comet 67P/Churyumov-Gerasimenko displays a pronounced hemispherical dichotomy in surface morphology where the southern hemisphere exhibits more erosional features than the northern hemisphere due to receiving much greater solar radiation. Consequently, it is generally assumed that particles are ejected from the southern hemisphere through sublimation and a significant fraction eventually descends as airfall, covering the northern terrains. To investigate this south-to-north material transfer during the comet's perihelion passage, we use photoclinometry to measure material redistribution within its most extensive smooth terrain deposit around the Imhotep region. However, our findings do not align with this expected trend. Instead, we show that local-scale processes substantially impact the erosion and accumulation of material, with one area experiencing net erosion while another nearby region, just a few dozen meters away, sees sediment buildup. Our analysis underscores the complex interplay of processes shaping Comet 67P's surface, and likely comets more generally. Subject Keywords: Small Bodies, Comets, Sublimation processes, sediment transport Sponsorship: This research was supported by the Rosetta Data Analysis Program (80NSSC19K1307) and the Heising-Simons Foundation (51 Pegasi b Fellowship to S.P.D.B). Date of data collection: June 2014 - August 2016 Geographic location of data collection: Rosetta Mission, Comet 67P/Churyumov-Gerasimenko Information about funding sources that supported the collection of the data: The Rosetta mission was funded by European Space Agency (ESA). SHARING/ACCESS INFORMATION Licenses/restrictions placed on the data: This dataset is shared under a Creative Commons 1.0 Universal Public Domain Dedication (https://creativecommons.org/publicdomain/zero/1.0/). The material can be copied, modified and used without permission, but attribution to the original authors is always appreciated. Links to publications that cite or use the data: Abhinav Jindal, Samuel Birch, Alexander Hayes, Fiona P. Özyurt, Adam Issah, Megan Barrington, Jason Soderblom, Randolph Kirk, Raphael Marschall, Jean-Baptiste Vincent. (2023) Measuring Erosional and Depositional Patterns Across Comet 67P's Imhotep Region. [submitted] JGR-Planets Links to other publicly accessible locations of the data: none Links/relationships to ancillary data sets: none Was data derived from another source? If yes, list source(s): This data was created using images that are publicly available on European Space Agency's Archive Image Browser, ESA/Rosetta/NAVCAM – CC BY-SA IGO 3.0 (https://imagearchives.esac.esa.int). Recommended citation for this dataset: Abhinav Jindal, Samuel Birch, Alexander Hayes, Fiona P. Özyurt, Adam Issah, Megan Barrington, Jason Soderblom, Randolph Kirk, Raphael Marschall, Jean-Baptiste Vincent. (2023) Digital Elevation Model Data from: Measuring Erosional and Depositional Patterns Across Comet 67P's Imhotep Region. [dataset] Cornell University eCommons Repository. https://doi.org/10.7298/qgyq-ym43 METHODOLOGICAL INFORMATION The OSIRIS NAC images used in this study were obtained from the European Space Agency's (ESA) Planetary Science Archive (PSA). The following Integrated System for Imagers and Spectrometers (ISIS, https://isis.astrogeology.usgs.gov/7.0.0/index.html) and Ames Stereo Pipeline (ASP; Beyer, Ross A., Oleg Alexandrov, and Scott McMichael. 2019. NeoGeographyToolkit/StereoPipeline: Ames Stereo Pipeline version 3.2.0. Zenodo. DOI: 10.5281/zenodo.7497499) tools were used to process the data in order to make input files for ASP's shape-from-shading tool. - Images obtained from the ESA PSA were converted to the ISIS3 cub data format using ISIS's rososiris2isis tool. - Next, SPICE information was attached to each image using ISIS's spiceinit tool. - An initial guess DEM was obtained from the SHAP4S shape model (https://doi.org/10.1051/0004-6361/201526349) and projected into an equirectangular projection using ISIS's cam2map tool. - All images were projected onto this initial guess DEM using ASP's mapproject tool. - The projected images were opened using ASP's stereo_gui tool and control points were manually selected across all images. These control points were then used as an input to ASP's bundle_adjust tool to bundle adjust the images. The bundle adjusted images along with the input DEM are passed as an input to ASP's SfS tool and output DEMs along with error maps for each region of interest are created. This procedure is described in more detail in Section 2 of Jindal et al. (2023), Measuring Erosional and Depositional Patterns Across Comet 67P's Imhotep Region. DATA & FILE OVERVIEW File List: Folders: R1-R14 contain relevant files for regions R1 through R14 described in Jindal et al. (2023), Measuring Erosional and Depositional Patterns Across Comet 67P's Imhotep Region. Each folder contains 4 files: 2 DEM files and 2 height error files. Relationship between files: The DEM files indicate the elevation of the surface, while the corresponding height error file indicates the uncertainty in the elevation. File Naming Conventions: DEM files are in the format $region-$period-DEM-final.tif, while the files indicating the error in height are in the format $region-$period-height-error.tif. $region can go from R1-R14 and describes the region label, while $period can go from P1-P2 and describes the time period reflected by the DEMS. More details on the regions and periods can be found in Jindal et al. (2023), Measuring Erosional and Depositional Patterns Across Comet 67P's Imhotep Region. Additional related data collected that was not included in the current data package: none Are there multiple versions of the dataset? no Description of methods used for collection/generation of data: Image data used to produce this data was collected using the Optical, Spectroscopic, and Infrared Remote Sensing Imaging System (OSIRIS) Narrow Angle Camera (NAC) on board the European Space Agency's Rosetta spacecraft. Methods for processing the data: Data is processed using ISIS and ASP tools Instrument- or software-specific information needed to interpret the data: data can be viewed using ASP's stereo_gui tool or using the GDAL library in python Quality-assurance procedures performed on the data: errors in elevation were computed for each DEM file People involved with sample collection, processing, analysis and/or submission: Rosetta Science Team, European Space Agency, Oleg Alexandrov, authors listed above, and co-authors of Jindal et al. (2023) Measuring Erosional and Depositional Patterns Across Comet 67P's Imhotep Region.