Lunar LRO NAC Haworth Photoclinometry DEM 1m
- Primary Authors
- NASA Ames
- Originators
- Molly O'Connor, Ross A. Beyer
- Publisher
- USGS Astrogeology Science Center
- Publication Date
- 2021-01-15
- Abstract
-
This is a shape-from-shading (SfS or photoclinometry) digital elevation model (DEM) for the Haworth area. The Haworth area is beyond the north rim of Haworth crater and centered at 338.0 (-21.0) E, -86.8 S on the Moon, its bounding box is approximately:
Upper Left 337.17387 E, -86.59046
Lower Left 334.27226 E, -86.95283
Upper Right 343.37578 E, -86.72032
Lower Right 341.12851 E, -87.09890
In brief, photoclinometry (or shape-from-shading) uses image pixel brightness, incidence and emission angles, and a photometric function to solve the inverse problem of what shape of surface produces the images observed. It can produce terrain with information approaching the pixel scale of the images. The best results come from an area with many images, and with those images having a variety of lighting directions, as this situation provides better constraints on the solution (because the derived surface must be able to produce each image when lit similarly).
These data products technically fit the definition of "foundational" data products (Laura and Beyer, 2021) even though they contain artifacts. The source LROC image data from which the topography and mosaic products are created are "controlled" by means of bundle adjustment to the LOLA 5 m/pixel polar product (Barker, et al., 2021). These data are "absolutely controlled" because they are rigorously tied to the underlying LOLA geodetic coordinate reference frame.
The LOLA and SfS-DEM products are orthonormic heights relative to the mean lunar radius of 1,737,400 m. It is important to note that the SfS-DEM data do not have fundamentally different absolute RMS errors from the errors reported for the LOLA data. The SfS-DEM data points are simply different estimates of elevation than the LOLA data points, but absolute RMS errors are the same as the parent LOLA data set.
All map-projected data in this directory is in the polar stereographic projection, defined with the following PROJ.4 String: +proj=stere +lat_0=-90 +lon_0=0 +k=1 +x_0=0 +y_0=0 +R=1737400 +units=m +no_defs
The data files available are:
- Lunar_LROnac_Haworth_sfs-dem_1m_v3.tif (*.lbl) Shape from Shading Digital Terrain Model as a GeoTIFF with 32-bit pixels indicating the elevation (n meters) with respect to the lunar radius of 1,737,400 m at 1 m/pixel. There are some large patches that had to be filled in with LOLA data, and some areas where the process has left obvious artifacts.
- Lunar_LROnac_Haworth_sfs-dem_shade_1m_v3.tif (*.lbl) The above SfS DTM hillshaded.
- Purpose
- The creation of these products was funded by the VIPER Project.
Contact and Distribution
- Format
- Digital Elevation Model, Grey Scale, Raster Data, Remote-sensing Data, Shaded-Relief Map, Topographic Map
- Access Constraints
- please cite authors
- Access Scope
- PDS
- Use Constraints
- public domain
- Edition
- Version
- Edition Name
- 3
- Supplemental Information
- https://doi.org/10.1029/2018EA000390, https://doi.org/10.1016/j.pss.2020.105119, https://doi.org/10.5281/zenodo.3963341
- Native Data Set Environment
- ESRI Arcinfo, GDAL, ISIS v3
- Astrogeology Theme
- Image Processing, Photoclinometry, Photogrammetry, Remote Sensing, Roving vehicles, Topography
- Mission Names
- Lunar Reconnaissance Orbiter
- Instrument Names
- LROC
- Online Package Link
- https://astrogeology.usgs.gov/search/map/lunar_lro_nac_haworth_photoclinometry_dem_1m
- External File Size
- 537 MB
- Online File Link
- https://planetarymaps.usgs.gov/mosaic/Lunar_Photoclinometry/Haworth-SfS/Lunar_LROnac_Haworth_sfs-dem_1m_v3.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)
- 2021-01-15
- Time Period of Content (stop)
- 2021-01-15
- Currentness Reference
- Publication date
- Progress
- Complete
- Update Frequency
- As needed
- Logical Consistency
- These data products technically fit the definition of "foundational" data products (Laura and Beyer, 2021) even though they contain artifacts. The source LROC image data from which the topography and mosaic products are created are "controlled" by means of bundle adjustment to the LOLA 5 m/pixel polar product. These data are "absolutely controlled" because they are rigorously tied to the underlying LOLA geodetic coordinate reference frame.
- Completeness Report
- There are some large patches that had to be filled in with LOLA data, and some areas where the process has left obvious artifacts.
- Process Description
- The Integrated Software for Imagers and Spectrometers (ISIS, v4.1.1, Sucharski, et al., 2020) was used for initial processing of the Lunar Reconnaissance Orbiter Camera (LROC) images that contributed to this terrain model. The NASA Ames Stereo Pipeline (ASP, v 2.7.0, Beyer, et al., 2020) was used for creation of the shape-from-shading terrain model, specifically the techniques in Alexandrov & Beyer (2018). The Geospatial Data Abstraction Library (GDAL, 2020) was used to create the hillshade map.
- Source Title
- LRO LROC and LOLA PDS Archives
- Source Online Linkage
- {https://pds.lroc.asu.edu/data/,https://pgda.gsfc.nasa.gov/products/78}
- Source PDS Archive
- Lunar Reconnaissance Orbiter
- PDS Status
- PDS 4 Like
- Attribute Accuracy Report
- Accurate to Control Net
- Horizontal Positional Accuracy Report
- Accurate to Control Net
- Vertical Positional Accuracy Report
- Accurate to Control Net
Geospatial Information
- Target
- Moon
- System
- Earth
- Feature Name
- Haworth crater
- Minimum Latitude
- -87.09890342731742
- Maximum Latitude
- -86.59046214259241
- Minimum Longitude
- -25.72774505919917
- Maximum Longitude
- -16.624216585089282
- Direct Spatial Reference Method
- Raster
- Object Type
- Grid Cell
- Raster Row Count (lines)
- 12060
- Raster Column Count (samples)
- 11660
- Bit Type (8, 16, 32)
- 32
- Quad Name
- Radius A
- 1737400
- Radius C
- 1737400
- Control Net
- LOLA, see Barker 2021
- Bands
- 1
- Pixel Resolution (meters/pixel)
- 1
- Scale (pixels/degree)
- 30323.35042414948
- Vertical Coordinate System Units
- Meters
- Map Projection Name
- Polar Stereographic
- Latitude Type
- Planetocentric
- Longitude Direction
- Positive East
- Longitude Domain
- -180 to 180
