urn:nasa:pds:magellan_scvdr:data_oif:oif04355 1.0 1.23.0.0 Product_Observational 2025-09-17 1.0 Initial PDS4 version Magellan Mission urn:nasa:pds:context:investigation:mission.magellan data_to_investigation The Magellan Spacecraft Host urn:nasa:pds:context:instrument_host:spacecraft.mgn is_instrument_host Magellan Spacecraft Radar System Instrument urn:nasa:pds:context:instrument:mgn.rdrs is_instrument Venus Planet urn:nasa:pds:context:target:planet.venus data_to_target SCVDR 1 4355 Mapping Cycle 3 mg_2145 urn:nasa:pds:magellan_scvdr:document:scvdr_sis data_to_document oif04355_1.dat 1994-10-11T06:00:47Z The Oblique Sinusoidal Image Data File (OIF) contains the results of fitting the radar backscatter cross-section measurements of a single Magellan orbit, from the oblique sinusoidal (polar) image file of the C-BIDR or F-BIDR product, to a quadratic function, along with a histogram of pixel values used in the fit. The OIF contains a CCSD header, a keyword and value SFDU, a binary header record SFDU, and one or more binary data record SFDUs, sandwiched between starting and ending marker SFDUs.

0 20 7-Bit ASCII Text CCSD header.

20 370 7-Bit ASCII Text SFDU keyword label (K-type).

Oblique Sinusoidal Image Header Table 390 1 The single binary OIF header record contains constants that describe the fitting process, algorithm IDs, and the maximum sizes of arrays in the OIF data records. 11 1 60 SFDU_AGGREGATE_HEADER 1 1 ASCII_String 20 'NJPL1I00001000000040', the number '0010' is registered with the NJPL SFDU authority as the 'Image Header Record'. '00000040' indicates that the remainder of this SFDU is 40 bytes in length. ORBIT_NUMBER 2 21 UnsignedMSB4 4 The Magellan orbit number for the data represented in these data records. VERSION_NUMBER 3 25 UnsignedMSB4 4 The version of the image data file used for these results. Obtained from the VERSION_ID keyword of the corresponding C-BIDR (or F-BIDR) Orbit Header File (Note: This turns out not to be a good indicator of the version of the data file; the Orbit Header File itself is rarely updated). NUMBER_OF_IMAGE_DATA_RECORDS 4 29 UnsignedMSB4 4 The number of image records that follow this header. NUMBER_OF_IMAGE_LINES_PER_RECORD 5 33 UnsignedMSB4 4 The number of C-BIDR (or F-BIDR) image lines compressed to form one output processed record (nominally 9). SOURCE_DATA_TYPE 6 37 UnsignedByte 1 Set to binary 0 if source data are from an F-BIDR, set to 1 if from a C-BIDR. FITTING_METHOD_FLAG 7 38 UnsignedByte 1 Zero for chi-square fitting to determine polynomial coefficients, 1 for linear least squares fitting. RMAP_MAJOR_SOFTWARE_VERSION 8 39 UnsignedMSB2 2 The major software version number of the Stanford program RMAP used to obtain the scattering function from the image data. RMAP_MINOR_SOFTWARE_VERSION 9 41 UnsignedMSB2 2 The minor software version number of the Stanford program RMAP used to obtain the scattering function from the image data. MAX_NUMBER_OF_ANGLES 10 43 UnsignedMSB2 2 The largest value of NUMBER_OF_ANGLES_IN_IR_BINS that will appear in this orbit. MAX_HISTOGRAM_SIZE 11 45 UnsignedMSB2 2 The largest value of NUMBER_OF_LEVELS_IN_I_COUNT that will appear in this orbit. 1 14 1 0 47 14 SPARE 1 1 UnsignedByte 1 Spare.