CLEM LIDAR Topography Derived Data

RDR – LIDAR Topography Reduced Data Record

Instrument: Light Imaging Detection and Ranging

PDS3 Data Set ID: CLEM1-L-LIDAR-5-TOPO-V1.0DOI: 10.17189/1519565

PDS4 Bundle:urn:nasa:pds:clementine1_gravity_and_topographyDOI: 10.17189/nc87-0q13

LRO PDS3 to PDS4 Migration Status: Complete

For more information about LIDAR derived products, see the PDS3 Data Set Catalog File or the Volume Information File.

The Light Imaging Detection and Ranging (LIDAR) Topography Derived data products are orbital altimetry profiles and gridded digital maps. These products are divided into two main collections: a topography data collection and a topography image collection. There are 6 products in total, which are detailed below, with links to the data products and labels.

PDS4 Collection	ODE Product ID	PDS4 Label File	Description
urn:nasa:pds:clementine1_gravity_and_topography:topography_data	GLTM2BPR	GLTM2BPR.XML	This file contains topographic profiles and related data along each observational pass during which LIDAR laser range data were acquired. The data were created using the final spacecraft orientation and orbital solutions. The laser ranges are believed to be correct, but there may be unresolvable ambiguities due to noise.
	GLTM2BSH	GLTM2BSH.XML	This file contains coefficients for a spherical harmonic model of the Moon’s topography field. The Clementine topography model is known as the Goddard Lunar Topography Model 2B (GLTM-2B). This is a 70th-degree and –order model, with extrapolation to the poles of the GLTM-2B data using GMT surface, the minimum curvature gridding program of Wessel and Smith (doi:10.1029/90EO00319). The coefficients are in meters, and are referred to a spherical datum of radius 1,738,000 m. Thus, the degree zero coefficient is the actual mean radius, minus 1,738,000.
	TOPOGRD1	TOPOGRD1.XML	This file contains a digital, 1 x 1 degree resolution gird of the topography of the Moon relative to a spheroid of radius 1738 km at the equator, with a flattening of 1/3234.93. The data are interpolated from the filtered observations by the “blockmean and surface programs” of the GMT-system of Wessel and Smith (doi:10.1029/90EO00319). It is a 360 x 180 grid from 89.5 to -89.5 degrees latitude, and 0.5 to 359.5 degrees longitude. No attempt has been made to provide data at the poles (i.e., beyond about 78 degrees), since the numbers are unconstrained. The observation is topography in meters.
	TOPOGRD2	TOPOGRD2.XML	This file contains a digital, 0.25 x 0.25 degree resolution grid of the topography of the Moon relative to a spheroid of radius 1738 km at the equator, with a flattening of 1/3234.93. The data are interpolated from the filtered observations by the “blockmean and surface programs” of the GMT-system of Wessel and Smith (doi:10.1029/90EO00319). It is a 1440 x 720 grid from 89.875 to -89.875 degrees latitude, and 0.125 to 359.875 degrees longitude. No attempt has been made to provide data at the poles (i.e., beyond about 78 degrees), since the numbers are unconstrained. The observation is topography in meters.
urn:nasa:pds:clementine1_gravity_and_topography:topography_map	TOPOGRD1_IMG	TOPOGRAD1.XML	This file contains a digital, 1 x 1 degree resolution map of the Moon’s topography relative to a spheroid of radius 1738 km at the equator, with a flattening of 1/3234.93. The data are interpolated from the filtered observations by the “blockmean and surface programs” of the GMT-system of Wessel and Smith (doi:10.1029/90EO00319). It is a 360 x 180 grid from 89.5 to -89.5 degrees latitude, and 0.5 to 359.5 degrees longitude. No attempt has been made to provide data at the poles (i.e., beyond about 78 degrees), since the numbers are unconstrained.
	TOPOGRD2_IMG	TOPOGRAD2.XML	This file contains a digital, 0.25 x 0.25 degree resolution map of the Moon’s topography relative to a spheroid of radius 1738 km at the equator, with a flattening of 1/3234.93. The data are interpolated from the filtered observations by the “blockmean and surface programs” of the GMT-system of Wessel and Smith (doi:10.1029/90EO00319). It is a 1440 x 720 grid from 89.875 to -89.875 degrees latitude, and 0.125 to 359.875 degrees longitude. No attempt has been made to provide data at the poles (i.e., beyond about 78 degrees), since the numbers are unconstrained.