Ceres Dawn FC2 HAMO Global DTM 137m v1

Product Information:

This digital terrain model (DTM) of Ceres based on the Dawn High Altitude Mapping Orbit (HAMO) Framing Camera 2 (FC2) images and derived by using the stereo photogrammetry (SPG) method. The HAMO DTM covers approximately 98% of Ceres surface (few permanently shadowed areas near the poles required interpolation). The DTM has a lateral spacing of ~136.7 meters per pixel (m) (60 pixel/degree) and a vertical accuracy of about 10 m. A global DTM is provided in an equidistant cylindrical projection and hemispheric DTMs are provided for both polar regions as stereographic projections. The DTMs are formatted as images where the DN values give the height in meters above a reference sphere of 470000.0m (Preusker et al., 2016).

Mission and Instrument Information:

The Dawn spacecraft launched on September 25, 2007 onboard a Delta II-Heavy Rocket. The instrument payload consisted of two identical framing cameras (FC1 & FC2), a visible and infrared mapping spectrometer (VIR, and a gamma ray and neutron detector (GRaND). DAWN is a National Aeronautics and Space Administration (NASA) Discovery Program mission managed by the Jet Propulsion Laboratory (JPL), with the principal investigator and science operations center located at the University of California, Los Angeles. The framing cameras were built by the Max Planck Institute for Solar System Research, with significant contributions by the German Aerospace Center, Institute of Planetary Research (DLR) and in coordination with the Institute of Computer and Communication Network Engineering (Polansky et al., 2016).

Dawn spacecraft orbited Ceres in a series of science orbits designed to gradually increase the resolution and quality of science measurements as the mission at each target (Vesta & Ceres) progressed. The four science orbits are: rotation characteristic (RC) at 14,000 km, survey at 4,900 km, high altitude mapping orbit (HAMO) 1,950 km, and low altitude mapping orbit (LAMO) 850 km. HAMO provided the opportunity to collect data for the global topography model by collecting six complete clear-image maps: two at nadir and four at of nadir attitudes (Polansky et al., 2016).

References:

Polanskey, C., Joy, S., & Raymond, C. (2016). Dawn Ceres Mission: Science Operations Performance. Paper presented at the SpaceOps Conference, Daejeon, Korea. https://arc.aiaa.org/doi/abs/10.2514/6.2016-2442

Preusker, F., Scholten, F., Matz, K. D., Elgner, S., Jaumann, R., Roatsch, T., Joy, S. P., Polanskey, C. A., Raymond, C. A., & Russell, C. T. (2016). Dawn at Ceres - Shape model and rotational state. Paper presented at the 47th Lunar and Planetary Science Conference, Lunar and Planetary Institute, Houston, TX. http://www.hou.usra.edu/meetings/lpsc2016/pdf/1954.pdf

Raymond, C. A., Jaumann, R., Nathues, A., Sierks, H., Roatsch, R., Preusker, F., Scholten, F., et al. (2011). The Dawn Topography Investigation. In Russell, C. & Raymond, C. (Eds.), The Dawn Mission to Minor Planets 4 Vesta and 1 Ceres (pp. 487-510). New York, NY: Springer. https://doi.org/10.1007/978-1-4614-4903-4_16

Roatsch, T., Kersten, E., Matz, K.-D., Preusker, F., Scholten, F., Jaumann, R., Raymond, C. A., & Russell, C. T. (2016). High-resolution Ceres High Altitude Mapping Orbit Atlas derived from Dawn Framing Camera images. Planetary and Space Sciences, 125, 103-107. https://doi.org/10.1016/j.pss.2016.05.011

Publisher: Dawn Team
Publication Date: 19 August 2016
Author: German Aerospace Center (DLR)
Originator: Dawn Team
Group: PDS
Added to Astropedia: 17 October 2016
Modified: 3 February 2020

General

Purpose

Part of the PDS release of Ceres higher level data (Level 2). Ceres Digital Terrain Model - Certified and released with minor liens as of October 11, 2016.

Dawn mission is equipped with two identical framing cameras (FC1 & FC2) which have one clear filter and seven band pass filters. At Ceres, only the FC2 was used to acquire science images while the FC1 was held in reserve. Clear filter images which were taken during HAMO were used to produce a global DTM of the illuminated part of Ceres [Preusker 2016]. Dawn orbited Ceres during in 6 cycles between August 16 and October 23, 2015 at the HAMO altitude of ~1475 km. A cycle is a single complete mapping of surface at a fixed attitude (nadir or off-nadir). The framing camera acquired about 2350 clear filter images [Preusker 2016] during the HAMO phase. The images were taken with different viewing angles and similar illumination conditions by slewing the spacecraft to various off-nadir attitudes. These images are analyzed by using the SPG method [Preusker 2016] to produce the Ceres HAMO DTM.

Geospatial Data Presentation Form

Grey Scale, Raster Data, Topographic Map, Digital Elevation Model

Series Id

DWNCHSPG_2

Edition

1.0

Online Linkage

https://planetarymaps.usgs.gov/mosaic/Ceres_Dawn_FC_HAMO_DTM_DLR_Global_60ppd_Oct2016.tif

Native Data Set Environment

ISIS v3

Supplemental Information

http://dawndata.igpp.ucla.edu/, http://www.sciencedirect.com/science/article/pii/S0032063312002589

Keywords

System: Small Bodies
Target: Ceres
Theme: Asteroids
Mission: Dawn
Search Terms: Dawn, Ceres, Elevation, DEM, DTM, Radius, Shapemodel

Contact and Distribution

Access Constraints: None
Use Constraints: Please cite authors

Data Status and Quality

Time Period of Content Begin: 26 December 2014
Time Period of Content End: 21 April 2016
Currentness Reference: Ground condition
Progress: In Work
Update Frequency: As needed
Logical Consistency Report: The DTMs are formatted as images where the DN values give the height in meters above a reference sphere of 470000.0m. The conversion from Digital Number to PLANETARY_RADIUS in meters is: PLANETARY_RADIUS = pixel_DN + 470000.0m
Completeness Report: There were a few permanently shadowed areas near the poles required interpolation.
Process Date: 16 August 2016
Process Description: The framing camera acquired about 2350 clear filter images [Preusker 2016] during the HAMO phase. The images were taken with different viewing angles and similar illumination conditions by slewing the spacecraft to various off-nadir attitudes. These images are analyzed by using the SPG method [Preusker 2016] to produce the Ceres HAMO DTM.
Vertical Positional Accuracy Value: 10
Vertical Positional Accuracy Report: Best Effort
Entity and Attribute Overview: Elevation in meters
Entity and Attribute Detailed Description: Conversion from Digital Number to HEIGHT, i.e. elevation in meters, is: HEIGHT = (DN * SCALING_FACTOR). The conversion from Digital Number to PLANETARY_RADIUS in meters is: PLANETARY_RADIUS = (DN * SCALING_FACTOR) + OFFSET where OFFSET is the radius of the reference sphere (470000.0 m).
Entity and Attribute Linkage: https://sbn.psi.edu/pds/resource/dawn/

Lineage

PDS Status: PDS 3 Archived
Source PDS Archive: Dawn
Source Originator: Planetary Data System
Source Publication Date: 11 October 2016
Source Title: Dawn at Ceres - Framing Camera
Source Online Linkage: https://sbn.psi.edu/pds/resource/dawn/dwncfcmosaics.html , https://sbn.psi.edu/pds/archive/maps.html
Type of Source Media: Online