Moon_LRO_NAC ClrShade Apollo 15 26N004E 150cmp

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This is a colorized shaded-relief of the digital elevation model (DEM) extracted from the Lunar Reconnaissance Orbiter Camera (LROC) Narrow Angle Camera (NAC) stereo images from the Lunar Reconnaissance Orbiter mission. The original data product is a DEM from stereo images acquired at approximately 0.5 meters/pixel resolution, which allows an output DEM resolution of 1.5 to 2.0 meters/pixel using a softcopy photogrammetry system. However, in some cases, LROC DEMs were also generated at lower resolutions. The DEM was registered horizontally and vertically to LRO's Lunar Orbiter Laser Altimeter (LOLA) data.

Mimetype: image/tiff
Filename: Moon_LRO_NAC_ClrShade_Apollo_15_26N004E_150cmp.tif
Publisher: Jet Propulsion Laboratory (JPL)
Publication Date: 21 May 2011
Originator: USGS Astrogeology Science Center
Group: Astrogeology
Added to Astropedia: 24 October 2013
Modified: 3 November 2017

General

Purpose: The NASA Constellation Program (CxP) has identified 50 regions of interest on the Moon that the LROC NAC will image. A DEM is generated for each of these regoins using the acquired NAC images. High resolution DEMs will be essential for identifying potential landing sites, landing site hazards, placement of landed assets on the surface, as well as other surface operations and navigation needs. Site-specific DEMs will also serve as a foundation for ortho-projection and control of local/site mosaics.
Geospatial Data Presentation Form: Digital Elevation Model

Keywords

System: Earth
Target: Moon
Theme: Topography
Mission: Lunar Reconnaissance Orbiter
Instrument: LROC

Data Status and Quality

Currentness Reference: Ground condition
Progress: Complete
Update Frequency: None planned
Process Date: 21 May 2011
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 below. 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 between percentages. > > nv 0 0 0 //No Data > 0% 255 120 255 //purple > 20% 120 120 255 //blue > 40% 120 255 255 //aqua > 60% 120 255 120 //green > 70% 255 255 120 //yellow > 90% 255 120 120 //red > 100% 255 255 255 //white > The shadows in the DEM were masked and images were used to fill in the shadowed areas where possible.
Horizontal Positional Accuracy Value: 24.1
Vertical Positional Accuracy Value: 10.3
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 Detailed Description: http://www.gdal.org/gdaldem.html