Phobos Mars Express HRSC DEM Global 100m

Primary Authors

Mars Express HRSC Instrument Team

Originators

Europlanet Research Infrastructure

Publisher

USGS Astrogeology Science Center

Publication Date

2009-06-01

Abstract

Product Information: Images from the European Space Agency's High Resolution Stereo Camera (HRSC) aboard the Mars Express were used to obtain 3-dimensional coordinates of surface points of Phobos. As currently the HRSC could not gain global coverage yet, the data was complimented by Viking orbiter image data to be able to provide the digital elevation model (DEM) globally (Willner et al., 2010). Resolution of this DEM is 100 meters per pixel (m). The research leading to the data products has received funding from the European Community's Seventh Framework Programme ([FP7/2007-2013]) under grant agreement number 263466 for the FP7-ESPaCE program. Mission and Instrument Information: Mars Express is a mission of the European Space Agency (ESA) it launched in June 2003 onboard a Soyuz-Fregat launcher from the Baikonur Cosmodrome in Kazakhstan. There are seven instrument suites onboard Mars Express: Aspera Energetic Neutral Atoms Analyzer (ASPERA), High/Super Resolution Stereo Colour Imager (HRSC, SRC), Mars Radio Science Experiment, Mars Subsurface Sounding Radar/Altimeter (MARSIS), Omega IR Mineralogical Mapping Spectrometer (Omega), Planetary Fourier Spectrometer (PFS), and UV and IR Atmospheric Spectrometer (SPICAM). The instrumentation onboard Mars Express was designed to reach the scientific objectives of the mission which include: global high-resolution photogeology at 10 m per pixel resolution, super resolution photogeology of selected areas of the planet at 2 meters per pixel, global high spatial resolution mineralogical mapping at a resolution range from a kilometer per pixel to several 100 meters per pixel, global atmospheric circulation characterization, subsurface characterization, surface-atmosphere interaction, structure of the interior and surface geochemistry and exobiology. Phobos is a very irregular body often approximated by a tri-axial ellipsoid for simplicity. With a mean distance of only 9375 km to the center of Mars – which relates to approximately 6000 km above the Martian surface – it is orbiting deep in the Martian gravity field. Its orbit is in a nearly equatorial plane and almost circular. Reference: Willner, K., Oberst, J., Hussmann, H., Giese, B., Hoffman, H., Matz, K.-D., Roatsch, T., & Duxbury, T. (2010). Phobos control point network, rotation, and shape. Earth and Planetary Science Letters, 294(3–4), 541-546. https://doi.org/10.1016/j.epsl.2009.07.033

Purpose

The German Aerospace Center (DLR) was involved in an in-depth study of Phobos, a natural satellite of Mars. Based on images of the multi-spectral line scanning High Resolution Stereo Camera (HRSC) and the Super Resolution Channel (SRC) – a frame camera – the department of Planetary Geodesy was to observe Phobos in its orbit, determined shape parameters computed global digital elevation models, prepared a first low scale maps based on image data only, derived new estimates on its rotational parameters and could derive mass distribution models agreeing to all other constraining parameters.

Contact and Distribution

Format

Digital Elevation Model, Remote-sensing Data, Topographic Map

Access Constraints

public domain

Access Scope

PDS

Use Constraints

Please cite authors

Edition

0.1

Supplemental Information

http://www.sciencedirect.com/science/article/pii/S0012821X09004506, https://www.dlr.de/dlr/en/desktopdefault.aspx/tabid-10364/548_read-400/#/gallery/657

Native Data Set Environment

ISIS v3

Astrogeology Theme

Image Processing, Photogrammetry, Satellites, Topography

Mission Names

Mars Express

Instrument Names

HRSC

Online Package Link

https://astrogeology.usgs.gov/search/map/phobos_mars_express_hrsc_dem_global_100m

External File Size

478 kB

Online File Link

https://planetarymaps.usgs.gov/mosaic/Phobos_ME_HRSC_DEM_Global_2ppd.tif

Contact Address

2255 N. Gemini Drive

Contact City

Flagstaff

Contact State

AZ

Contact Postal Code

86001

Contact Email

astroweb@usgs.gov

Data Status and Quality

Time Period of Content (start)

2003-01-01

Time Period of Content (stop)

2009-12-31

Currentness Reference

Ground condition

Progress

In Work

Update Frequency

As needed

Logical Consistency

HRSC images were used to obtain 3-dimensional coordinates of surface points of Phobos (Willner et al., 2010).

Completeness Report

As currently the HRSC could not gain global coverage yet, the data was complimented by Viking orbiter image data to be able to provide the digital terrain model globally. It is anticipated to further improve and update the terrain model, the preliminary image mosaics, and maps with more image data available.

Process Description

VICAR was used obtain 3-dimensional coordinates of surface points of Phobos from stereo images gathered by HRSC (Willner et al., 2010).

Lineage

Process Date

2009-06-01

Source Title

Phobos

Source Online Linkage

{https://pds-imaging.jpl.nasa.gov/volumes/mex.html,https://pds-imaging.jpl.nasa.gov/portal/mex_mission.html}

Source PDS Archive

Mars Express

PDS Status

PDS 3 Archived

Attribute Accuracy Report

Best Effort

Horizontal Positional Accuracy Report

Best Effort

Geospatial Information

Target

Phobos

System

Mars

Minimum Latitude

-90.15

Maximum Latitude

90

Minimum Longitude

-180.15

Maximum Longitude

180.66

Direct Spatial Reference Method

Raster

Object Type

Grid Cell

Raster Row Count (lines)

349

Raster Column Count (samples)

699

Bit Type (8, 16, 32)

16

Quad Name

Radius A

11100

Radius C

11100

Bands

1

Pixel Resolution (meters/pixel)

100

Scale (pixels/degree)

1.9373

Map Projection Name

Simple Cylindrical

Latitude Type

Planetocentric

Longitude Direction

Positive East

Longitude Domain

-180 to 180