Digital elevation model software interface specification

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MESSENGER
DIGITAL ELEVATION MODEL SOFTWARE INTERFACE SPECIFICATION
Version 1.6

Prepared by:

Kris Becker, Kenneth Edmundson, Lynn Weller, and Chris Isbell

U.S. Geological Survey

Ernest Bowman-Cisneros, Emerson Speyerer, and Megan Henriksen

Arizona State University

Frank Preusker

Institute of Planetary Research, German Aerospace Center (DLR)

Susan Ensor, Mike Reid, and Haje Korth

The Johns Hopkins University Applied Physics Laboratory

Updated March 29, 2017

DOCUMENT REVIEW

This document and the archive it describes have been through PDS Peer Review and have been accepted into the PDS archive.

Kris Becker, MESSENGER DEM Working Group, has reviewed and approved this document.

Patricia Garcia, PDS Imaging Node Representative, has reviewed and approved this document.

Susan Ensor, MESSENGER Science Operations Center Lead, has reviewed and approved this document.

DOCUMENT CHANGE LOG

Date	Version	Description	Sections affected
04/01/16	1.0	Initial release.	All
04/14/16	1.2	Update MLA comparisons for USGS and add comparisons for DLR plus miscellaneous minor edits.	4.3.2, 4.3.3
04/18/16	1.4	Indexing updates, sample label changes, miscellaneous edits.	All
04/27/16	1.5	Additional miscellaneous edits.	1.1, 1.2
10/18/16	1.5.1	ASU DEMs planetary radius descriptions. Fixed sub-sectioning in sec. 6.1.	4.3.4.2, 6.1
11/07/16	1.5.3	ASU updates describing regional DEMs. Changed ASU orthorectified image naming convention, removed JPEG2000 subdirectory from REGIONAL.	4.3.4.2, 4.3.4.3, fig. 10, fig. 11, 5.2.7.1
03/29/17	1.6	Removed extraneous keyword definitions from Table 9, added QUAD to the DEM and EXTRAS directories and moved the DLR DEMs to those. Added Lambert Conformal as a projection type for the DLR DEMs.	9 (Table 16), 5.2: Fig. 11, Table 11, Table 12, Table 13, 5.2.7.1

Table of Contents

1Introduction 8

1.1Purpose & Scope 8

1.2Contents 8

1.3Applicable Documents and References 8

1.4Relationship with Other Interfaces 11

2Instrument Overview 11

3Standards Used in Generating Products 12

3.1PDS Standards 12

3.2Data Storage Conventions 13

3.3Time Standards 13

3.4Cartographic Standards 13

3.4.1Equirectangular Projections 13

3.4.2Simple Cylindrical Projections 14

3.4.3Polar Stereographic Projections 14

3.4.4Lambert Conformal Conic Projections 16

4DEM Product Specification 16

4.1Dataset Definition and Scope 16

4.2Data Volume 16

4.3DEM Processing 16

4.3.1Data Processing Level 18

4.3.2USGS GLOBAL DEM Product Description 19

4.3.2.1Overview 19

4.3.2.2Image Selection Process 19

4.3.2.3Global Image Control 20

4.3.2.4Least Squares Bundle Adjustment (ISIS module jigsaw) 21

4.3.2.5DEM Product Generation 22

4.3.2.6Accuracy Assessment 22

4.3.2.7 USGS Additional Products 24

4.3.2.7.1The Source Product List File 24

4.3.2.7.2Radius Point Cloud Table 24

4.3.3DLR REGIONAL DEM Product Description 25

4.3.3.1Overview 25

4.3.3.2Images and Stereo Image Selection 25

4.3.3.3Multi-image Matching 26

4.3.3.4Triangulation and Bundle Block Adjustment Techniques 26

4.3.3.5DEM Generation 27

4.3.3.6DEM Quality Assessment 28

4.3.3.7Generation of the Quadrangle H06 DEM 28

4.3.3.8Comparison with USGS and MLA/RFO DEMs 31

4.3.4ASU REGIONAL DEM Product Description 34

4.3.4.1Images and Stereo Image Selection 34

4.3.4.2DEM Production Methodology 35

4.3.4.3DEM Quality Assessment 36

5Archive Volume Structure and Contents 38

5.1Archive Identification Parameters 38

5.2Directory Structure 38

5.2.1Root Directory 38

5.2.2INDEX Directory 39

5.2.3CATALOG Directory 40

5.2.4DOCUMENT Directory 41

5.2.5DEM Directory 41

5.2.5.1DEM/GLOBAL, REGIONAL and POLAR Directories 41

5.2.6EXTRAS Directory 43

5.2.7File Type, Naming and Storage 43

5.2.7.1Product Naming Conventions 43

5.2.7.1.1Sample File Names 46

6Label Descriptions 47

6.1Sample DEM Product Labels 47

6.1.1USGS Global DEM (IMG) PDS Label 47

6.1.2USGS Global DEM (JPEG 2000) PDS Label 49

6.1.3USGS Global DEM (Source Product List) PDS Label 50

6.1.4USGS Global DEM (Point Cloud File) PDS Label 51

6.1.4.1Point Cloud Table Format Description 52

6.1.5USGS Polar DEM (IMG) PDS Label 55

6.1.6DLR Regional DEM (IMG) PDS Label 56

6.1.7DLR Regional DEM (JPEG 2000) PDS Label 58

6.1.8ASU Regional DEM (IMG) PDS Label 59

6.1.9ASU Regional Confidence Map (IMG) PDS Label 61

6.1.10ASU Regional Orthorectified Image (IMG) PDS Label 62

6.2Product Validation 63

6.3Release Plan 63

7Appendix - Data Archive Terms 64

8Appendix - SPICE Kernel Files Used in MESSENGER Data Products 64

9Appendix – PDS Label Keyword Definitions 65

List of Tables

List of Figures

ACRONYMS

APL	The Johns Hopkins University Applied Physics Laboratory
ASCII	American Standard Code for Information Interchange
ASU	Arizona State University
BAE	British Aerospace
CDR	Calibrated Data Record
CK	Attitude/Pointing Kernel (NAIF SPICE)
CODMAC	Committee on Data Management and Computation
CRP	Cubic Rational Polynomial
DAP	Derived Analysis Product
DEM	Digital Elevation Model
DLR	Institute of Planetary Research, German Aerospace Center, Berlin, Germany
DN	Data Number
DOY	Day of Year
EDR	Experiment Data Record
ESA	European Space Agency
FOM	Figure of Merit
FOV	Field of View
GB	Gigabyte
GDAL	Geospatial Data Abstraction Library
GeoTIFF	Geospatial Tagged Image File Format
IAU	International Astronomical Union
IEC	International Electrotechnical Commission
I/F	Intensity divided by flux, or the ratio of radiance to incident solar irradiance
ISIS	Integrated Software for Imagers and Spectrometers
ISO	International Standards Organization
JPEG	Joint Photographic Experts Group
JHU/APL	The Johns Hopkins University Applied Physics Laboratory
JPL	Jet Propulsion Laboratory
LSB	Least Significant Byte
MAD	Median Absolute Deviation
MESSENGER	MErcury, Surface, Space ENvironment, GEochemistry, and Ranging
MDIS	Mercury Dual Imaging System
MLA	Mercury Laser Altimeter
NAC	Narrow Angle Camera
NAIF	Navigation and Ancillary Information Facility
NASA	National Aeronautics and Space Administration
NGATE	Next Generation Automatic Terrain Extraction (program in BAE Systems/SOCET SET)
ODL	Object Description Language
PCK	Planetary Constants Kernel (NAIF SPICE)
PDS	Planetary Data System
PSI	Planetary Science Institute
RDR	Reduced Data Record
RFO	Radio Frequency Occultation
RMS	Root Mean Square
RMSE	Root Mean Square Error
SCLK	Spacecraft Clock Kernel (NAIF SPICE)
SIS	Software Interface Specification
SOC	Science Operations Center
SOCET SET	SOftCopy Exploitation Toolkit SET (BAE Systems photogrammetry software toolkit)
SPICE	Spacecraft Planet Instrument C-matrix Events; a set of data formats for spacecraft ephemeris, attitude, and instrument pointing
SPK	Spacecraft and Planet Kernel (NAIF SPICE)
TIFF	Tagged Image File Format
TBD	To Be Determined
USGS	U.S. Geological Survey
UTC	Coordinated Universal Time
VICAR	Video Image Communication And Retrieval (JPL image processing software system)
WAC	Wide Angle Camera
XML	eXtensible Markup Language

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