MRO HiRISE, DEM Columbia Hills

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Identification_Information:

Citation:

Citation_Information:

Originator: TBD

Publication_Date: 01011970

Title: MRO HiRISE, DEM Columbia Hills

Description:

Abstract:

Preliminary visible digital elevation model mosaic for Columbia Hills candidate landing site for the Mars 2020 rover. HRSC orthoimages and DEMs were downloaded from the Planetary Data System archives. HiRISE and CTX orthoimages and DEMs were created by the USGS Astrogeology and HiRISE teams, and compiled and georeferenced at JPL/Caltech by the Advanced Laboratory for Landing Site Terrain Analysis and Reconnaissance (ALLSTAR) group including Nathan Williams, Heather Lethcoe-Wilson, Lauren Berger, Marshall Trautman, and Matt Golombek for the M2020 Council of Terrains. These files are for discussion and planning purposes only. Processing Notes: Georeferencing: HRSC orthos are well-coregistered to the community-standard MOLA global topography products, and CTX orthos are well-coregistered to the HRSC orthos. Tie points were recorded at small craters visible in both HiRISE and CTX images, and a first-order transformation was used to rectify the HiRISE. Those same tiepoints and transformations were subsequently applied to their respective DEMs.
DEM Leveliång: The HiRISE DEMs obtained directly from the USGS or HiRISE team often float in space relative to one another with large (often 10s of m) offsets at the seams. We fit a plane to the differences between each HiRISE DEM and its coregistered CTX DEM, and subtracted that fitted plane from the HiRISE DEM values to level (vertically align) the DEMs to minimize artificial topographic cliffs at seams.
Projection and Coordinate System: Former mosaic basemaps for M2020 used a Mars equirectangular projection with a standard parallel of 0 (also called Plate Carree), but this caused a ~5% latitude vs longitude distortion at the remaining 3 candidate landing sites such that true circles would appear elliptical. In this new version of basemaps, we use a Mars equirectangular projection with customized standard parallels for each site to reduce distortion to <1%. Specifically, Columbia Hills uses a standard parallel of -14.5 degrees, while Jezero and NE Syrtis both have a standard parallel of +18 degrees. Projection (.prj) files are included with this delivery. When analyzing images, please ensure that the correct projection system is being used. For example, there is a known issue with Matlab where reading images in as a geotiff may automatically assign an incorrect projection without the specified standard parallel, which then produces distorted linear (in meters) x/y values.

Purpose: TBD

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Single_Date/Time:

Calendar_Date: 19700101

Currentness_Reference: In work

Status:

Progress: In work

Maintenance_and_Update_Frequency: As needed

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -180

East_Bounding_Coordinate: 180

North_Bounding_Coordinate: 90

South_Bounding_Coordinate: -90

Keywords:

Theme:

Theme_Keyword_Thesaurus: TBD

Theme_Keyword: TBD

Access_Constraints: PRIVATE

Use_Constraints: TBD

Metadata_Reference_Information:

Metadata_Date: 19700101

Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: MarsTrek Team

Contact_Address:

Address_Type: Postal

City: Pasadena

State_or_Province: CA

Postal_Code: 91109

Contact_Voice_Telephone: TBD

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Metadata_Standard_Version: TBD