Bennu OSIRIS-REx OCAMS Global PAN Mosaic 5cm v1
In early 2019, NASA's OSIRIS-REx (Origins, Spectral Interpretation, Resource Identification, and SecurityRegolith Explorer) mission surveyed asteroid (101955) Bennu with a collection of instruments, including the OSIRIS-REx Camera Suite (OCAMS) PolyCam imager. Using PolyCam panchromatic images, we constructed a globally controlled basemap of Bennu at an approximate ground sample distance of 5cm (5cm/pixel) with a mean spatial accuracy of ~30 cm. The basemap was photometrically normalized using a Minneart phase angle correction. New mapping methods were developed to combine images of Bennu's irregular shape and extremely rough surface into a nearly seamless mosaic. For more see Bennett (2020).
- We produced a global basemap of asteroid Bennu at a ground sample distance of 5 cm.
- New methods were developed to deal with Bennu's rough surface and irregular shape.
- Images were rectified to a 3D digital terrain model with a mean facet size of 80 cm.
- Images were photometrically normalized to 30° phase angle using a Minneart model.
- Overlaps were masked along natural feature boundaries for a nearly seamless result.
This download is an 8bit version of the original mosaic. The mapping used to convert to 8bit was a linear stretch from 0.0 - 0.044 to 1 - 254, maintaining 0 as NoDATA. There are several related images available for download including the original 32bit mosaic in I/F (reflectance). You can find those here. This includes:
- PAN_mosaic_reflectance_32bit - this mosaic in 32bit floating point I/F (reflectance).
- BodyFixedXYZ - 3 images containing X,Y,Z in a body-fixed system per pixel in the original mosaic.
- EmisAngle_IncAngle_PixelRes - 3 images showing emission and incidence angles, and original pixel resolution.
- SunIlluminationMask - A simple image showing masked pixel map.
Bennett, C. A., DellaGiustina, D. N., Becker, K. J., Becker, T. L., Edmundson, T. L., Golish D. R., et. al. (2020). A high-resolution global basemap of (101955) Bennu. Icarus. Advance online publication. https://doi.org/10.1016/j.icarus.2020.113690
Lauretta, D. S., Balram-Knutson, S. S., Beshore, E., Boynton, W. V., Drouet d'Aubigny, C., DellaGiustina, D. N., et al. (2017). OSIRIS-REx: Sample Return from Asteroid (101955) Bennu. Space Science Review, 212, 925-984. https://doi.org/10.1007/s11214-017-0405-1
Williams, B., Antreasian, P., Carranza, E., Jackman, C., Leonard, J., Nelson, D., Page, B., et al. (2018). OSIRIS-REx Flight Dynamics and Navigation Design. Space Science Review, 214(69). https://doi.org/10.1007/s11214-018-0501-x
Bierhaus, E. B., Clark, B. C., Harris, J. W., Payne, K. S., Dubisher, R. D., Wurts, D. W., Hund, R. A., et al. (2018). The OSIRIS-REx Spacecraft and the Touch-and-Go Sample Acquisition Mechanism (TAGSAM). Space Science Reviews, 214(107). https://doi.org/10.1007/s11214-018-0521-6
Berry, K., Sutter, B., May, A., Williams, K., Barbee, B. W., Beckman, M., & Williams, B. (2013). OSIRIS-REx Touch-and-gGo (TAG) Mission Design and Analysis. Paper presented at the 36th Annual AAS Guidance and Control Conference, American Astronautical Society, Rocky Mountain Section, Breckenridge, Colorado, USA. https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20130013409.pdf
- Planetary Data System
- Publication Date
- 26 February 2020
- Lunar and Planetary Laboratory, University of Arizona
- C.A. Bennett, D.N.DellaGiustina, K.J.Becker, T.L.Becker, K.L.Edmundson, D.R. Golish, et. al.
- Added to Astropedia
- 5 June 2020
- 3 May 2021
As OSIRIS-REx is a sample return mission, a basemap is needed to identify a safe and sampleable location for the spacecraft's sample acquisition maneuver (Berry et al., 2013; Williams et al., 2018; Lauretta et al., 2017). Therefore, the global basemap must have sufficient resolution to clearly show geologic features including craters, ridges, boulders, and any other potentially hazardous objects.
- Geospatial Data Presentation Form
- Global Mosaic
- Online Linkage
- Native Data Set Environment
- ISIS v3, GDAL
- Black and White
- Supplemental Information
- https://www.sciencedirect.com/science/article/pii/S0019103520300816, https://sbn.psi.edu/pds/resource/orex/ocams.html, https://www.asteroidmission.org/
- Small Bodies
- Asteroids, Cartography, Image Processing, Photogrammetry, Remote Sensing, Sampling and analysis
- Search Terms
- Asteroid, Asteroid surfaces, Image Processing, OSIRIS-REx, Bennu, mosaic, global
Contact and Distribution
- Access Constraints
- please cite authors
- Use Constraints
- public domain
Data Status and Quality
- Time Period of Content Begin
- 21 March 2019
- Time Period of Content End
- 11 April 2019
- Currentness Reference
- Ground condition
- Update Frequency
- As needed
- Logical Consistency Report
- This is a visual 8bit version of the original 32bit floating point version in I/F (reflectance). The mapping used to convert to 8bit was a linear stretch from 0.0 - 0.044 to 1 - 254, maintaining 0 as NoDATA.
- Completeness Report
Most images that contribute to the global panchromatic basemap were acquired during Flybys 3, 4A, and 4B. Select data from Flybys 5A and 6A were also incorporated to provide better coverage in high-latitude regions that were poorly illuminated in the earlier flybys.
- Process Description
OCAMS images were photogrammetrically controlled to correct for spacecraft position and camera pointing uncertainties in reconstructed SPICE kernels. This process improved the registration between the images and the DTM (“image-to-ground”) and between the images themselves (“image-to-image”). Image features were manually registered to the DTM to create ground control points (GCPs). see the reference Bennett 2020 above.
- Horizontal Positional Accuracy Value
- Horizontal Positional Accuracy Report
- Accurate to Control Net
- Entity and Attribute Detailed Description
- basemap was radiometrically calibrated images in units of reflectance (also known as I/F or radiance factor) acquired by the OCAMS PolyCam imager and photometrically normalized using a Minneart phase angle correction.
- Entity and Attribute Linkage
- PDS Status
- PDS 3 Compatible
- Source Originator
- Source Publication Date
- 26 February 2020
- Source Title
- OSIRIS-REx PDS archive
- Source Online Linkage
- Type of Source Media
- Attribute Accuracy Report
- Best Effort
- Minimum Latitude
- Maximum Latitude
- Minimum Longitude
- Maximum Longitude
- Direct Spatial Reference Method
- Object Type
- Lines (pixels)
- Samples (pixels)
- Bit Type
- Radius A
- Radius C
- Control Net
- Pixel Resolution (meters/pixel)
- Scale (pixels/degree)
- Horizontal Coordinate System Units
- Map Projection Name
- Latitude Type
- Longitude Direction
- Positive East
- Longitude Domain
- 0 to 360