CCSD3ZF0000100000001NJPL3IF0PDSX00000001 PDS_VERSION_ID = PDS3 RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 80 SPACECRAFT_NAME = MAGELLAN TARGET_NAME = VENUS OBJECT = TEXT PUBLICATION_DATE = 1995-01-01 NOTE = "MAGELLAN SCVDR ARCHIVE CD-WO" END_OBJECT = TEXT END MAGELLAN SCVDR ARCHIVE CD-WO 1. Introduction This CD-WO contains Magellan SCVDR (Surface Characteristics Vector Data Record) products. It also contains documentation files which describe the SCVDRs. Each SCVDR data directory contains altimetry, oblique backscatter, and radiometry measurements for a single orbit, along with the ancillary files necessary to understand the data. The SCVDR products archived on this volume are the exact products released by the Magellan Project. However, all data files have been suffixed with ASCII carat characters ('^', decimal 94) to make them a multiple of 32500 bytes in length (to assist VAX-VMS users). Errors and anomalies are noted where detected. Supporting documentation and label files conform to the Planetary Data System (PDS) Standards, Version 3.0, Jet Propulsion Laboratory (JPL) document JPL D-7669. 2. Disk Format The disk has been formatted so that a variety of computer systems (e.g. IBM PC, Macintosh, Sun) may access the data. Specifically, it is formatted according to the ISO 9660 level 1 Interchange Standard. For further information, refer to the ISO 9660 Standard Document: RF# ISO 9660-1988, 15 April 1988. 3. File Formats Each orbit for which SCVDR data exist is represented by a set of up to 6 data files copied from the SCVDR tape product: ANFnnnnn.v - Altimetry Inversion File, generated from the ALT-EDR raw altimetry data records, using the G-Matrices in a GMF file in the [GEOMETRY] directory on this volume. EDFnnnnn.v - Emissivity File, generated from the radiometric mode of the Magellan radar, either from the ALT-EDR or C-BIDR data records. NFFnnnnn.v - Altimetry Inversion Fit File, generated from the ANF file of the same orbit and version number. OHFnnnnn.v - Orbit Header File, describing the other files of this orbit and version number. OIFnnnnn.v - Oblique Sinusoidal Image File, derived from the polar image file of the C-BIDR (Compressed basic image data record) product by fitting the SAR backscatter values to a polynomial in incidence angle. SIFnnnnn.v - Sinusoidal Image File, derived from the non-polar image file of the C-BIDR (Compressed basic image data record) product by fitting the SAR backscatter values to a polynomial in incidence angle. where 'nnnnn' represents the orbit number, and 'v' the numeric version number. The content of each file is described in a detached PDS label, a file with the same 8-letter name and an extension of "LBL". Further information on SCVDR file formats and their contents can be obtained from the Magellan Software Interface Specification document SU-MGN-SCVDR, version 1.0, October 1, 1992. All document files (*.TXT) and detached label files (*.LBL) contain 80-byte fixed-length records, with a carriage return character (ASCII 13) in the 79th byte and a line feed character (ASCII 10) in the 80th byte. The first two lines are an exception: the first contains a 40-byte SFDU aggregate label, followed by a carriage return and a line feed. The second contains 36 space characters (ASCII 32) followed by a carriage return and a line feed. The first PAIR of lines is therefore 80 bytes long, and all remaining lines are offset from the start of the file by a multiple of 80 bytes. This allows the files to be read by the MacOS, DOS, Unix, and VMS operating systems. The PDS label file has the same name as the data file it describes, with the extension .LBL. PDS labels are object-oriented. The object to which the label refers (e.g. HEADER, 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: ^TABLE = ("ANF01000.1",312) indicates that the TABLE object begins at byte 312 of the file ANF01000.1, in the same directory as the detached label file. Below is a list of the possible formats that use the ^object keyword. ^object = n ^object = n ^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. 4. CD-ROM Contents The files on this CD-ROM are organized in one top-level directory with several subdirectories. The following table shows the structure and content of these directories. In the table, 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 Overview of errors on this, and previous, | volumes of SCVDRCD products. | |- VOLDESC.CAT A description of the contents of this CD-ROM | volume in a format readable by both human and | computers. | |- [CATALOG] A directory containing information about the | | Magellan SCVDR dataset. | | | |- CATINFO.TXT Description of contents of the CATALOG directory. | | | |- DATASET.CAT PDS dataset catalog object | | | |- INST.CAT PDS instrument catalog object | | | |- INSTHOST.CAT PDS spacecraft catalog object | | | |- MISSION.CAT PDS mission catalog object | | | |- PERSONEL.CAT PDS personnel catalog object | | | `- REFS.CAT PDS reference catalog object | |- [DOCUMENT] A directory containing document files relating | | to this disk. | | | |- SCVDR.ASC A machine readable version of the SU-MGN-SCVDR | | SIS document describing the format and content of | | the Magellan SCVDR Products. | | | |- SCVDR.LBL A detached PDS label file describing SCVDR.ASC | | and SCVDR.PS. | | | |- SCVDR.PS A copy of SCVDR.ASC in PostScript format, | | suitable for previewing on a high-resolution | | graphics terminal or direct printing on a | | laser printer or photo-typesetter. | | | |- SCVDRCD.ASC A machine readable version of the PDS-GEO-SCVDRCD | | SIS document describing the format of the | | Magellan SCVDRCD Archive CD-WO volumes. | | | |- SCVDRCD.LBL A detached PDS label file describing SCVDRCD.ASC | | and SCVDRCD.PS. | | | |- SCVDRCD.PS A copy of SCVDRCD.ASC in PostScript format, | | suitable for previewing on a high-resolution | | graphics terminal or direct printing on a | | laser printer or photo-typesetter. | | | `- DOCINFO.TXT Description of contents of the DOCUMENT directory. | |- [GEOMETRY] A directory containing the G-Matrix files used to | | generate the ANF data files on this volume. | | | |- GEOMINFO.TXT Description of the contents of this directory. | | | |- GMFnnnnn.v G-Matrix file used to generate ANF data files. | | | `- GMFnnnnn.LBL Description of GMFnnnnn.v. | |- [INDEX] A directory containing information about the | | contents of this CD-WO volume. | | | |- CUMINDEX.LBL Description of CUMINDEX.TAB. | | | |- CUMINDEX.TAB Cumulative index of all SCVDR archive data files. | | | |- INDEX.LBL Description of INDEX.TAB. | | | |- INDEX.TAB Index of SCVDR archive data files on this volume. | | | `- INDXINFO.TXT Description of the contents of the INDEX directory. | |- [LABEL] A directory containing information on PDS formats | | beyond what is in individual detached LBL files. | | | |- SCVDRANF.FMT Format of ANF data records. | | | |- SCVDRANH.FMT Format of the ANF header record. | | | |- SCVDREDF.FMT Format of EDF data records. | | | |- SCVDREDH.FMT Format of the EDF header record. | | | |- SCVDRGMF.FMT Format of GMF data records. | | | |- SCVDRGMH.FMT Format of the GMF header record. | | | |- SCVDRIMF.FMT Format of SIF and OIF data records. | | | |- SCVDRIMH.FMT Format of the SIF and OIF header record. | | | |- SCVDRNFF.FMT Format of NFF data records. | | | |- SCVDRNFH.FMT Format of the NFF header record. | | | |- SCVDROHF.FMT Format of the single OHF data record. | | | `- LABINFO.TXT Description of contents of the LABEL directory. | |- [SOFTWARE] A directory containing C-language source code | | for reading SCVDR data files. | | | |- MAKEFILE.MAK Script used by the UNIX "make" command to | | generate executables from these source files. | | | |- SCV_RDR.C Low level routines to read SCVDR data files into | | the structures defined in SCVDR.H | | | |- SCV_RDR.I Function definition skeleton for SCV_RDR.C. | | | |- SCVDR.H Definition of SCVDR data structures. | | | |- SCVDRSCN.PL Perl script to list contents of SCVDR data files. | | | |- SCVPARSE.C Low level routines to parse SFDU structures. | | | |- SCVPARSE.H Definition of SFDU header structures. | | | |- SCVPARSE.I Function definition skeleton for SCVPARSE.C. | | | |- SOFTINFO.TXT Description of contents of the SOFTWARE directory. | | | |- TESTANF.C A program that illustrates how to read an | | altimetry inversion file. | | | |- TESTEDF.C A program that illustrates how to read an | | emissivity file. | | | |- TESTGMF.C A program that illustrates how to read a | | G-matrix file. | | | |- TESTIF.C A program that illustrates how to read an | | image data file. | | | |- TESTNFF.C A program that illustrates how to read an | | inversion fit file. | | | |- TESTOHF.C A program that illustrates how to read an | | orbit header file. | | | `- TYPES.H Miscellaneous SCVDR definitions. | `- [Snnnn_vv] Directories containing SCVDR data files for | orbit `nnnn', version `vv'. | |- ANFnnnnn.v Altimetry Inversion File |- EDFnnnnn.v Emissivity File |- NFFnnnnn.v Altimetry Inversion Fit File |- OHFnnnnn.v Orbit Header File |- OIFnnnnn.v Oblique Sinusoidal Image File |- SIFnnnnn.v Sinusoidal Image File `- tttnnnnn.LBL PDS labels for the data files 5. Whom to Contact for Information For questions concerning this volume set: G. Leonard Tyler Stanford University Center for Radar Astronomy Durand Bldg., Room 213 Stanford, CA 94305-4055 Telephone: 415-723-3535 Datafax: 415-723-9251 Internet: len@nova.stanford.edu Richard Simpson Stanford University Center for Radar Astronomy Durand Bldg., Room 232 Stanford, CA 94305-4055 Telephone: 415-723-3525 Datafax: 415-723-9251 Internet: rsimpson@magellan.stanford.edu 6. Cognizant Persons Magellan Raymond Arvidson Archive Project McDonnell Center for the Space Sciences Coordinator Department of Earth and Planetary Sciences Washington University St. Louis, MO 63130 SCVDR Data, Richard Simpson documentation Stanford University Center for Radar Astronomy Durand Bldg., Room 232 Stanford, CA 94305-4055 Volume generation, Peter Ford and Joan Quigley validation, labels, MIT 37-601, Cambridge, MA 02139-4307 catalog templates Internet: pds-requests@space.mit.edu This disk was produced at MIT by Peter Ford and Joan Quigley.