CCSD3ZF0000100000001NJPL3IF0PDS200000001 = SFDU_LABEL RECORD_TYPE = STREAM OBJECT = TEXT NOTE = "Notes on using the image index tables." PRODUCT_CREATION_TIME = 1990-12-20 END_OBJECT END NOTES ON USING THE IMAGE INDEX TABLES These notes describe the contents and format of the three image index tables on this CD-ROM, IMGINDEX.TAB, CUMINDEX.TAB and LOSTIMAG.TAB, including a list of the fields in the tables. The image index table (IMGINDEX.TAB) contains one record for each image file on this Viking Orbiter CD-ROM. The cumulative image index table (CUMINDEX.TAB) contains one record for each image file on all the Viking Orbiter CD-ROMs published so far. The following description applies to both of these tables. The image index tables are formatted so that they may be read directly into many database management systems on various computers. All fields are separated by commas, and character fields are enclosed in double quotation marks ("). Each record contains 512 bytes of ASCII character data (1 character = 1 byte). Bytes 511 and 512 contain the 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 structure and content of the image index tables are described in the file VOLINFO.TXT located in the DOCUMENT directory. The files IMGINDEX.LBL and CUMINDEX.LBL contain labels for IMGINDEX.TAB and CUMINDEX.TAB coded in the Object Description Language (ODL), providing a formal description of the index table structure. Users of most commercial database management systems should be able to use the list below to define the names and characteristics of each field and then to load the tables into their systems using a delimited ASCII text input format. If necessary the specific column start positions and lengths can be used to load the data. For personal computer users, DBASE III DBF structures are also provided in the files IMGINDEX.DBF and CUMINDEX.DBF. These files can be used to load the IMGINDEX.TAB or CUMINDEX.TAB files into DBASE III or IV with the following commands: USE IMGINDEX APPEND FROM IMGINDEX.TAB DELIMITED USE CUMINDEX APPEND FROM CUMINDEX.TAB DELIMITED Once the table is loaded into DBASE III, it can generally be automatically loaded into other data managers or spreadsheets that provide search and retrieval capabilities. The list below presents the following information for each field in the image index table: the full name of the field, the data type represented by the field (character, integer, or real), the byte at which the field starts, and the number of bytes in the field. For fields that represent real numbers, the number of digits to the right of the decimal point is also given. Character fields are left justified, and numeric fields are right justified. The "start byte" and "number of bytes" values listed here do not include the commas between fields or the quotation marks surrounding character fields. IMAGE INDEX TABLE CONTENTS Field Full Name Data Start Number Decimal type Byte of Bytes Places ----- ------------------- ---- ----- -------- ------- 1 IMAGE_ID character 2 8 2 IMAGE_NUMBER integer 12 8 3 SPACECRAFT_NAME character 22 16 4 MISSION_PHASE_NAME character 41 32 5 TARGET_NAME character 76 8 6 IMAGE_TIME character 87 20 7 EARTH_RECEIVED_TIME character 110 20 8 ORBIT_NUMBER integer 132 8 9 INSTRUMENT_NAME character 142 34 10 GAIN_MODE_ID character 179 8 11 FLOOD_MODE_ID character 190 8 12 OFFSET_MODE_ID character 201 8 13 FILTER_NAME character 212 10 14 EXPOSURE_DURATION real 224 8 6 15 NOTE character 234 160 16 IMAGE_VOLUME_ID character 397 8 17 IMAGE_FILE_NAME character 408 28 18 BROWSE_VOLUME_ID character 439 8 19 BROWSE_FILE_NAME character 450 28 The lost image table (LOSTINDX.TAB) contains one record for each image that would have been included on this CD-ROM but was either not received on earth, or could not be recovered from the master data record tapes or experiment data record tapes. The lost image table is formatted similar to the image index files. Each record contains 394 bytes of ASCII character data (1 character = 1 byte). Bytes 395 and 396 contain the 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 structure and content of the lost image table is the same as the image index tables except the last four fields are omitted. The file LOSTIMAG.LBL contains the label for LOSTIMAG.TAB coded in the Object Description Language (ODL), providing a formal description of the lost image table structure. Users of most commercial database management systems should be able to use the list below to define the names and characteristics of each field and then to load the lost image table into their systems using a delimited ASCII text input format. If necessary the specific column start positions and lengths can be used to load the data. For personal computer users, a DBASE III DBF structure is also provided in the file LOSTIMAG.DBF. This file can be used to load the LOSTIMAG.TAB file into DBASE III or IV with the following command: USE LOSTIMAG APPEND FROM LOSTIMAG.TAB DELIMITED Once the table is loaded into DBASE III, it can generally be automatically loaded into other data managers or spreadsheets that provide search and retrieval capabilities. The list below presents descriptive information for each field in the lost image table. LOST IMAGE TABLE CONTENTS Field Full Name Data Start Number Decimal type Byte of Bytes Places ----- ------------------- ---- ----- -------- ------- 1 IMAGE_ID character 2 8 2 IMAGE_NUMBER integer 12 8 3 SPACECRAFT_NAME character 22 16 4 MISSION_PHASE_NAME character 41 32 5 TARGET_NAME character 76 8 6 IMAGE_TIME character 87 20 7 EARTH_RECEIVED_TIME character 110 20 8 ORBIT_NUMBER integer 132 8 9 INSTRUMENT_NAME character 142 34 10 GAIN_MODE_ID character 179 8 11 FLOOD_MODE_ID character 190 8 12 OFFSET_MODE_ID character 201 8 13 FILTER_NAME character 212 10 14 EXPOSURE_DURATION real 224 8 6 15 NOTE character 234 160