PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM SPACECRAFT_NAME = "LUNAR PROSPECTOR" TARGET_NAME = MOON OBJECT = TEXT PUBLICATION_DATE = 2005-02-02 NOTE = "LUNAR PROSPECTOR SPHERICAL HARMONIC MODELS AND DIGITAL MAPS ARCHIVE" END_OBJECT = TEXT END LUNAR PROSPECTOR SPHERICAL HARMONIC MODELS AND DIGITAL MAPS ARCHIVE 1. Introduction This archive contains Lunar Prospector (LP) spherical harmonic models of the lunar gravity field, and digital maps of the Bouguer anomalies, free-air gravity accelerations and errors, and geoid anomalies and errors. It also contains documentation which describes the products. The spherical harmonic products and the 64-bit digital maps in this archive are the exact products released by the Lunar Prospector Project. The ASCII maps and 8-bit browse images were produced at the Planetary Data System (PDS) Geophysics Subnode at Washington University, St. Louis, MO. Supporting documentation and label files conform to the PDS Standards, Version 3.2, Jet Propulsion Laboratory (JPL) document JPL D-7669. The LP nominal mission lasted for one year to mid-January 1999 and the extended mission will continue at a 30 km average altitude to the end of July 1999. The data in this archive covers the nominal mission and the first 10 days of the 30 km average altitude orbit of the extended mission. This archive is available electronically via the PDS Geosciences Node web site: http://pds-geosciences.wustl.edu/missions/lunarp/shadr.html 2. File Formats The data files are in 3 formats: array, image, and tabular (ASCII and binary). The array formats are 2-dimensional ASCII global grids of 180 lines by 360 samples (i.e. 1 degree resolution). These files are described by detached PDS labels. There are images of each of the gridded ASCII data files. Each image is 180 lines by 360 samples, with one byte per sample. The images are described by detached PDS labels. There are also 64-bit binary digital map images of the Bouguer anomalies, free-air gravity accelerations and errors, and geoid anomalies and errors. These digital maps are described by detached PDS labels. A description of the form and content of these files can be found in the file RSDMAP.TXT in the CATALOG directory. All the images are in a simple cylindrical map projection. A description of this type of map projection can be found in the file DSMAP.CAT, in the CATALOG directory. ASCII tabular files are formatted so that they may be read directly into many software analysis systems on various computers. All fields are separated by commas, and character fields are enclosed in double quotation marks ("). Character fields are left justified, and numeric fields are right justified. The "start byte" and "bytes" values listed in the labels do not include the commas between fields or the quotation marks surrounding character fields. The records are of fixed length, and the last two bytes of each record contain the ASCII carriage return and line feed characters. This allows a table to be treated as a fixed length record file on computers that support this file type and as a normal text file on other computers. Tabular files are described by PDS detached labels. All document files and detached label files contain stream format records, with a carriage return character (ASCII 13) and a line feed character (ASCII 10) at the end of each line. This allows the files to be read by the MacOS, DOS, Unix, and VMS operating systems. The detached PDS label file has the same name as the data file it describes, with the extension .LBL; for example, the file JGL100J1.SHA is accompanied by the detached label file JGL100J1.LBL in the same directory. PDS labels are object-oriented. The object to which the label refers (e.g., IMAGE, TABLE, etc.) is denoted by a statement of the form: ^object = location in which the carat character (^, also called a pointer in this context) indicates that the object starts at the given location. In an embedded label, the location is an integer representing the starting record number of the object (the first record in the file is record 1). In a detached label, the location denotes the name of the file containing the object, along with the starting record or byte number. For example: ^IMAGE = "JGL090J1.IMG" indicates that the IMAGE object points to the file JGL090J1.IMG, in the same directory as the detached label file. Below is a list of the possible formats for the ^object keyword. ^object = n ^object = n ^object = "filename.ext" ^object = ("filename.ext",n) ^object = ("filename.ext",n) where n is the starting record or byte number of the object, counting from the beginning of the file (record 1, byte 1) indicates that the number given is in units of bytes filename is the upper-case file name ext is the upper-case file extension 3. Archive Contents The files in this archive are organized in one top-level directory with several subdirectories. The following diagram shows the structure and content of these directories. In the diagram, directory names are enclosed in square brackets ([]), upper-case letters indicate an actual directory or file name, and lower-case letters indicate the general form of a set of directory or file names. FILE CONTENTS Top-level directory | |- AAREADME.TXT The file you are reading. | |- ERRATA.TXT Notes and errata regarding this volume. | |- VOLDESC.CAT A description of the archive contents. | |- [ASCII] A directory containing ASCII data files. | |- [BROWSE] A directory containing byte-scaled images of | the ASCII data files in the ASCII directory. | |- [CATALOG] A directory containing PDS catalog files, | | and information about the datasets. | | | |- CATINFO.TXT Description of files in the CATALOG | | directory. | | | |- DSMAP.CAT A description of the simple cylindrical | | map projection. | | | |- DATASET.CAT PDS dataset catalog file. A description | | of the spherical harmonic gravity model | | and digital gravity map dataset, including | | parameters, processing, data coverage | | and quality. | | | |- MISSION.CAT A brief description of the mission. It | | includes a chronology of events, definition | | of mission phases, and science objectives. | | | |- INSTHOST.CAT A description of the Lunar Prospector spacecraft | | and an overview of the NASA Deep Space | | Network (DSN). | | | |- RSSINST.CAT An overview of the spacecraft radio science | | system on Lunar Prospector and a summary | | description of the Deep Space Network | | instrumentation which supports radio science | | experiments. | | | |- REF.CAT A listing of references used elsewhere in | | the streamlined catalog files and of references | | that might be generally useful in working | | with these data. | | | |- PERSON.CAT A listing of key people involved in | generating and processing the archival dataset. | |- [DOCUMENT] A directory containing document files | | relating to this archive. | | | |- DOCINFO.TXT Description of files in the DOCUMENT | | directory. | | | |- SHADR.TXT The SIS document describing the format and | | content of the ASCII spherical harmonic data files | | in the SHA directory. | | | |- SHBDR.TXT The SIS document describing the format and | | content of the binary spherical harmonic data files | | in the SHB directory. | | | |- RSDMAP.TXT The SIS document describing the format and | content of the radio science digital map files | in the IMG directory. | |- [IMG] A directory containing digital gravity images | and PDS detached labels. | |- [SHA] A directory containing ASCII spherical | harmonic models of the gravity field | and PDS detached labels. | |- [SHB] A directory containing a binary spherical | harmonic model of the gravity field | and a PDS detached label. | |- [INDEX] A directory containing index files | relating to this archive. | |- INDEX.LBL A PDS detached label describing INDEX.TAB | |- INDEX.TAB A tabular summary of the files in this | archive. | |- INDXINFO.TXT A description of the files in the INDEX directory. 4. Whom to Contact for Information For questions concerning this archive, associated PDS labels and documentation: Jim Alexopoulos Washington University Dept. of Earth and Planetary Sciences 1 Brookings Drive Campus Box 1169 St. Louis, MO 63130 314-935-8152 jim@wuzzy.wustl.edu For questions concerning the generation of the spherical harmonic gravity model and digital gravity map products and the data products: Alex S. Konopliv Jet Propulsion Laboratory California Institute of Technology 4800 Oak Grove Drive MS 301-125J Pasadena, CA 91109 818-354-6105 ask@krait.jpl.nasa.gov This archive was produced by Jim Alexopoulos.