PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM OBJECT = TEXT PUBLICATION_DATE = 2016-03-03 NOTE = "Description of the INDEX directory contents." END_OBJECT = TEXT END INDEX Directory Contents The INDEX directory contains tabular index files describing the content of the data set. Each tabular index is accompanied by a detached PDS label. The index files present depend upon the files in the data set. Required files present in all data sets: --------------------------------------- INDXINFO.TXT - The file you are reading. INDEX.TAB - Main INDEX table listing all label files INDEX.LBL - PDS Label for the main INDEX table N.B. The INDEX.TAB file contains columns for the RELEASE_ID and REVISION_ID. This is a system used by the PSA to incrementally build up a data set and to provide a mechanism by which files can be updated without reconstructing the entire data set. The system is not used by all missions. For those missions not using the concept, a default value of RELEASE_ID=0001 REVISION_ID=0000 is used in the INDEX label and table. Optional files, depending on the content of the data set: -------------------------------------------------------- BROWSE_INDEX.TAB - INDEX table listing all label files in the BROWSE directory BROWSE_INDEX.LBL - PDS Label for the BROWSE_INDEX table GEO_XXXX.TAB - Geometry and position index file, where XXXX = the reference target used to compute the geometric parameters. GEO_XXXX.LBL - PDS Label for the GEO_XXXX.TAB index file Other index files can be defined by the data set developer to list products in their data set and to provide valuable information and relate various parameters to their data products. These are individual to each data set. Notes on Using the Index Tables ------------------------------- Each index table contains one row (record) for each data product on the volume. The table is formatted so that it can be read directly into many data management systems. 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. Each record ends with ASCII carriage return and line feed characters. This allows the 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. The PDS label file for each table describes the content and structure of the fields in the index table. This description includes the name of each field, its format, and a brief definition. The values for start byte and number of bytes listed in the label file do not include commas between fields or quotation marks surrounding character fields.