Ceres Dawn FC HAMO Colorized Shaded-relief 60ppd (137mp) Oct. 2016

This is a colorized shaded-relief of the original Ceres digital terrain model (DTM). This DTM was created from 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 a DTM has a lateral spacing of ~136.7 m/pixel (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.

Radius legend is available on right side.

References:

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, 47th Lunar and Planetary Science Conference (LPSC) - USRA-Houston, 2016 , Abstract 1954. http://www.hou.usra.edu/meetings/lpsc2016/pdf/1954.pdf

Roatsch,T., E. Kersten,K.-D. Matz,F. Preusker, F. Scholten, R. Jaumann,C.A. Raymond, C.T.Russell, High-resolution Ceres High Altitude Mapping Orbit Atlas derived from Dawn Framing Camera images, Planetary and Space Sciences, in press, 2016.

Preusker, F., J. Oberst, J. Head, T. Watters, M. Robinson, M. Zuber, S. Solomon, Stereo topographic models of Mercury after three MESSENGER flybys. Planet. Space Sci. (2011). DOI:10.1016/j.pss.2011.07.005

Raymond, C.A., R. Jaumann, A. Nathues, H. Sierks, T. Roatsch, F. Preusker, F. Scholten, R.W. Gaskell, L. Jorda, H.-U. Keller, M.T. Zuber, D.E. Smith, N. Mastrodemos, and S. Mottola, The Dawn topography investigation. Space Sci. Rev. 163, 487 (2011). DOI: 10.1007/s11214-011-9863-z

Polanskey, C., S. Joy, and C. Raymond, "Dawn Ceres Mission: Science Operations Performance", SpaceOps 2016 Conference, SpaceOps Conferences, (in press).

Mimetype: application/isis
Filename: Ceres_Dawn_FC_HAMO_ClrShade_DLR_Global_60ppd_Oct2016.cub
Publisher: Dawn Team
Publication Date: 17 October 2016
Author: German Aerospace Center (DLR)
Originator: USGS Astrogeology Science Center
Group
Added to Astropedia: 17 October 2016
Modified: 11 December 2019

General

Purpose: 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.
Geospatial Data Presentation Form: Color, Digital Elevation Model, Topographic Map
Series Id: DWNCHSPG_2
Edition: 1.0
Native Data Set Environment: ISIS v3, GDAL
Color: Color
Supplemental Information: http://sbn.psi.edu/pds/resource/dwncfc2.html

Keywords

System: Small Bodies
Target: Ceres
Theme: Asteroids
Search Terms: Dawn, Ceres, shaded-relief, elevation, radius, topography

Contact and Distribution

Access Constraints: None
Use Constraints: None

Data Status and Quality

Time Period of Content Begin

26 December 2014

Time Period of Content End

26 April 2016

Currentness Reference

Ground condition

Progress

In Work

Update Frequency

As needed

Logical Consistency Report

Some shadows were interpolated to fill in the original DTM

Completeness Report

This is a preliminary product.

Process Date

16 August 2016

Process Description

All processing was completed using Geospatial Data Abstraction Library (GDAL) tools on the original LROC DEM. To derive this colorized shaded-relief these three GDAL commands were used:

(1) gdaldem hillshade input_dem output_hillshade -z 2 (ZFactor) -az 315 (Azimuth) -alt 45 (Altitude) (2) gdaldem color-relief input_dem color_text_file output_color_relief_map > (3) hsv_merge.py output_color_relief_map output_hillshade output_color-hillshade.

Pixels do not contain any of the original explicit elevation information. The colorized shaded-relief represents approximate elevations based on the original topographic data. Elevations values are mapped based on the defined red, green, and blue mapping listed next. All NoData values are mapped to 0, 0, 0 (black). Thus 0 percent (purple) maps to minimum elevation and 100 percent (white) maps to maximum using a linear stretch. -----

nv 0 0 0 ; 437232.0 255 120 255 //purple ; 447197.0 120 120 255 //blue ; 457162.0 120 255 255 //aqua ; 467127.0 120 255 120 //green ; 472109.5 255 255 120 //yellow ; 482074.5 255 120 120 //red ; 487057.0 255 255 255 //white

Horizontal Positional Accuracy Report

Unknown

Vertical Positional Accuracy Value

Vertical Positional Accuracy Report

Best Effort

Entity and Attribute Overview

Shaded-relief, or hillshading, simulates shadows cast upon a raised topographic map, or more abstractly upon the planetary surface.

Entity and Attribute Linkage

http://www.gdal.org/gdaldem.html

Lineage

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: http://sbn.psi.edu/pds/resource/dwncfc2.html
Type of Source Media: Online
Attribute Accuracy Report: Best Effort

Geospatial Information

Minimum Latitude: -90
Maximum Latitude: 90
Minimum Longitude: 0
Maximum Longitude: 360
Direct Spatial Reference Method: Raster
Object Type: Pixel
Lines (pixels): 10800
Samples (pixels): 21600
Bit Type: 8
Quad Name
Radius A: 470000
Radius C: 470000
Bands: 3
Pixel Resolution (meters/pixel): 136.7174581
Scale (pixels/degree): 60
Horizontal Coordinate System Units: Meters
Map Projection Name: Equirectangular
Latitude Type: Planetocentric
Longitude Direction: Positive East
Longitude Domain: 0 to 360

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