PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM SPACECRAFT_NAME = "MARS GLOBAL SURVEYOR" TARGET_NAME = "MARS" OBJECT = TEXT NOTE = "Report dataset anomalies and errors" INTERCHANGE_FORMAT = ASCII PUBLICATION_DATE = 1999-03-10 END_OBJECT = TEXT END MGSC_0001: Image AB-1-018/03 was only partially contained in the packets archived on CD-ROM by the MGS Project. A version based on data retrieved on 10/10/1997 from the JPL telemetry system contained nearly a megabyte of additional image data. We have archived the image derived from these additional packets as well as the packets that are on the CD. We suspect a bug in the JPL "besting" algorithm or in the process which archived the packets. The affected CD file is for year 1997, day 284, hour 12. Four images on this volume (AB-1-004/01, AB-1-004/02, AB-1-005/06, and AB-1-016/03) have incorrectly computed values for the NORTH_AZIMUTH and SUB_SOLAR_AZIMUTH fields in the IMGINDX.TAB file, which are displayed as "NaN" (Not a Number, indicating IEEE floating point error handling of conditions such as divide by zero.) These fields should have the NOT_APPLICABLE_CONSTANT of 0.00 as they could not be computed from available information. These errors are corrected in the CUMINDX.TAB file starting on volume MGSC_0004. MGSC_0002: Images AB-1-069/01 and AB-1-072/01 did not have all C-kernel (pointing) information available and were assumed to be nadir-pointed. Images AB-1-069/07 and AB-1-075/06 have complex geometry with respect to the south pole which exposed a bug in the calculation of the USAGE_NOTE; in both cases the flag should be "N". MGSC_0003: Images AB-1-109/01, AB-1-109/02, AB-1-109/03, AB-1-109/04, AB-1-109/05, AB-1-135/01, AB-1-135/02, AB-1-135/03, AB-1-135/04, AB-1-135/05, and AB-1-135/06 did not have all C-kernel (pointing) information available and were assumed to be nadir-pointed and +X forward. For these orbits the spacecraft was oriented +X backward (with its +X axis against rather than with the velocity vector), so the USAGE_NOTEs should be inverted in all cases and the corner coordinates similarly flipped left-to-right. Image AB-1-103/05 has complex geometry with respect to the south pole which exposed a bug in the calculation of the USAGE_NOTE; the flag should be "N". MGSC_0001, MGSC_0002, MGSC_0003: The imgindx.lbl and cumindx.lbl files on these three volumes have errors in the START_BYTE field caused by an incorrect data type for the EDIT_MODE_ID field and an incorrect byte count for the NORTH_AZIMUTH field. These files are corrected on subsequent volumes, and the cumindx.lbl file on those volumes should be consulted. After production, errors were found in the GAIN_MODE_ID and OFFSET_MODE_ID fields for the following images: AB-1-005/06 -- GAIN_MODE_ID "2A" AB-1-023/05 -- OFFSET_MODE_ID "22" AB-1-029/08 -- OFFSET_MODE_ID "20" AB-1-034/04 -- GAIN_MODE_ID "1A", OFFSET_MODE_ID "1" AB-1-037/05 -- GAIN_MODE_ID "0A", OFFSET_MODE_ID "72" AB-1-040/05 -- GAIN_MODE_ID "0A", OFFSET_MODE_ID "69" AB-1-044/05 -- GAIN_MODE_ID "2A", OFFSET_MODE_ID "55" AB-1-047/06 -- GAIN_MODE_ID "2A", OFFSET_MODE_ID "84" AB-1-050/04 -- OFFSET_MODE_ID "76" AB-1-055/04 -- OFFSET_MODE_ID "71" AB-1-063/04 -- GAIN_MODE_ID "4A", OFFSET_MODE_ID "56" AB-1-063/05 -- GAIN_MODE_ID "4A", OFFSET_MODE_ID "56" AB-1-065/04 -- OFFSET_MODE_ID "58" AB-1-065/05 -- OFFSET_MODE_ID "48" AB-1-072/04 -- GAIN_MODE_ID "EA", OFFSET_MODE_ID "14" AB-1-074/04 -- OFFSET_MODE_ID "56" AB-1-074/05 -- OFFSET_MODE_ID "60" AB-1-088/04 -- GAIN_MODE_ID "4A", OFFSET_MODE_ID "82" AB-1-095/05 -- GAIN_MODE_ID "CA", OFFSET_MODE_ID "31" AB-1-096/04 -- OFFSET_MODE_ID "65" AB-1-104/08 -- GAIN_MODE_ID "8A", OFFSET_MODE_ID "32" AB-1-108/04 -- OFFSET_MODE_ID "20" AB-1-108/05 -- GAIN_MODE_ID "6A", OFFSET_MODE_ID "40" AB-1-110/03 -- OFFSET_MODE_ID "44" AB-1-111/03 -- GAIN_MODE_ID "2A", OFFSET_MODE_ID "57" AB-1-112/03 -- OFFSET_MODE_ID "32" AB-1-113/03 -- GAIN_MODE_ID "8A", OFFSET_MODE_ID "14" AB-1-114/03 -- GAIN_MODE_ID "8A", OFFSET_MODE_ID "13" AB-1-118/03 -- GAIN_MODE_ID "4A", OFFSET_MODE_ID "44" In addition, the LINE_EXPOSURE_DURATION for AB-1-003/03 was actually 71.68 milliseconds. These errors are corrected in the CUMINDX.TAB file starting on volume MGSC_0004. In addition, the image files themselves, with corrected image headers, are in the directory "ab1fixes" on MGSC_0005. MGSC_0004: Images 211/02, 211/03, 211/05, 227/01, 227/02, 227/04, 245/05, 246/01, 246/02, 246/03, and 246/04 did not have pointing information and were assumed nadir-pointed. The packets archived by the MGS Project on CD-ROM are ordered incorrectly for orbit 216. This results is incorrect processing by our telemetry tools. We have archived an intermediate product based on data retrieved during operations until this problem is resolved. The file affected is for year 1998, day 93, hour 6. Image 214/02 on MGSC_0004 was not processed correctly. A corrected version is included on MGSC_0010. The USAGE_NOTES for image 222/03 on MGSC_0004 was incorrectly computed and should be 'F'. MGSC_0005: Images 263/01, 263/02, 263/03, 265/01, 265/02, and 265/04 did not have pointing information and were assumed nadir-pointed. MGSC_0006: Images 372/01 and 372/02 did not have pointing information and were assumed nadir-pointed. The clocking rates for images 373/04 and 384/04 on MGSC_0006 were incorrectly recorded. The correct value is 6.9 msec in both cases. Corrected parameters and image files appear in the tables on MGSC_0010. The USAGE_NOTES for image 351/02 on MGSC_0006 was incorrectly computed and should be 'F'. Image 347/04 on MGSC_0006 was not processed correctly. A corrected version is included on MGSC_0010. All images from orbit 338 were omitted from MGSC_0006 and are included on MGSC_0010. MGSC_0008: Images 465/01, 465/02, 467/02, 467/03, 471/01, and 471/02 did not have pointing information and were assumed nadir-pointed. MGSC_0009: Images 498/01, 498/02, 498/03, 498/99, 504/01, 504/02, 504/03, 504/04, 504/99, 506/99, 508/01, 508/99, 510/99, 517/01, 517/02, 517/06, 525/01, 525/02, 525/03, 525/04, and 525/99 did not have pointing information and were assumed nadir-pointed. Note that the "99" images are filler images, usually of space, and are included for archival completeness. MGSC_0010: All images from the Phobos orbits (476, 501, 526, and 551) were processed with Phobos position information from the NAIF SP kernel file mar033-5.bsp. Owing to limitations in our processing software, coordinate information is relative to the IAU triaxial ellipsoid model of Phobos in some instances, and relative to a spheroid with equatorial radius 13.4 km and polar radius 9.2 km in other instances, and should be treated with some caution. C-kernel information was not available for Phobos images 526/01, 526/02, and 526/03, and in these cases the ancillary values are grossly in error. Images 533/05, 533/99, 537/01, 537/02, 537/03, 537/04, 537/05, 537/06, 537/99, 541/99, 544/01, 544/02, 544/04, 544/05, 547/01, 547/02, 547/04, 547/05, 547/06, 548/04, 548/05, 548/06, and 548/07 did not have pointing information and were assumed nadir-pointed. Note that the "99" images are filler images, usually of space, and are included for archival completeness. This volume also contains the following images from previous volumes: All images from orbit 338 was omitted from MGSC_0006 and are included on MGSC_0010. Images 443/06 and 445/03 on MGSC_0008 had incorrect image parameters in their headers. Correct versions are included on MGSC_0010. Images 214/02 on MGSC_0004 and 347/04 on MGSC_0006 were not processed correctly. Corrected versions are included on MGSC_0010. The clocking rates for images 373/04 and 384/04 on MGSC_0006 were incorrectly recorded. They were 6.9 msec in both cases. Corrected parameters and image files appear in the tables on MGSC_0010. The USAGE_NOTES for images 222/03 on MGSC_0004 and 351/02 on MGSC_0006 were incorrectly computed and should be 'F' in both cases. General: As of the production of this volume, there were no known general errata. As a point of clarification, if an image is to be flipped left-right because its USAGE_NOTE has a value of 'F', it may still have to be rotated into a north-up orientation as indicated by the NORTH_AZIMUTH parameter. Further, a roughly-north-up orientation may still require a rotation of 180 degrees after flipping. ===================================================================== April 23, 1999 Results of validation on the archive of MGS/MOC image data products performed by the Planetary Data System. Updated files for the anamolies noted below are available at the PDS Imaging Node web site (see below for more details). MGSC_0008: File SP2443/SP244306.IMG has incorrect values for the FILE_NAME and PRODUCT_ID keywords located in the PDS labels of the file. Additionally, the records in the IMGINDX.TAB and CUMINDX.TAB files corresponding to this image file have incorrect entries: FILE_NAME = "SP243306.IMG" PRODUCT_ID = "SPO-2-433/06" should be: FILE_NAME = "SP244306.IMG" PRODUCT_ID = "SPO-2-443/06" File SP2445/SP244503.IMG has incorrect values for the FILE_NAME and PRODUCT_ID keywords located in the PDS labels of the file. Additionally, the IMGINDX.TAB and CUMINDX.TAB files have incorrect entries: FILE_NAME = "SP245503.IMG" PRODUCT_ID = "SPO-2-455/03" should be: FILE_NAME = "SP244503.IMG" PRODUCT_ID = "SPO-2-445/03" ALL VOLUMES: IMGINDX.LBL and CUMINDX.LBL: The IMGINDX.LBL and CUMINDX.LBL files have a syntax error in the description field for the SOLAR_LONGITUDE (48th column). The description field has embedded double quote marks in the string field causing the label parser to report a syntax error. MGSC_0004: IMGINDX.TAB and CUMINDX.TAB The 81st record of the IMGINDX.TAB on MGSC_0004 has a record length incompatible with the rest of the records in the file. As a result, the CUMINDX.TAB on this volume and subsequent volumes have this problem in record 714 (this is the same record as the 81-st record of the IMGINDX.TAB file on volume MGSC_0004). Counter to previous comments in the ERRATA.TXT file, the following image observations, indicated by the product id, do not have updated FILE_NAME, VOLUME_ID, LINE_EXPOSURE_DURATION, GAIN_MODE_ID, and OFFSET_MODE_ID values in the IMGINDX.TAB and CUMINDX.TAB. The proper values are indicated below. These corrections could not be applied to the table files because the file name is too long for the field length provided. These corrected images (incorrect on previous volumes) were not added to the IMGINDX.TAB and CUMINDX.TAB files. CORRECT CORRECT PRODUCT_ID VOLUME_ID FILE_NAME --------------------------------------------------------------------- AB-1-003/03 MGSC_0005 ab1fixes/ab1003/ab100303.img EXPOSURE=71.68 AB-1-005/06 MGSC_0005 ab1fixes/ab1005/ab100506.img GAIN =2A AB-1-023/05 MGSC_0005 ab1fixes/ab1023/ab102305.img OFFSET=22 AB-1-029/08 MGSC_0005 ab1fixes/ab1029/ab102908.img OFFSET=20 AB-1-034/04 MGSC_0005 ab1fixes/ab1034/ab103404.img GAIN=1A OFFSET=1 AB-1-037/05 MGSC_0005 ab1fixes/ab1037/ab103705.img GAIN=0A OFFSET=72 AB-1-040/05 MGSC_0005 ab1fixes/ab1040/ab104005.img GAIN=0A OFFSET=69 AB-1-044/05 MGSC_0005 ab1fixes/ab1044/ab104405.img GAIN=2A OFFSET=55 AB-1-047/06 MGSC_0005 ab1fixes/ab1047/ab104706.img GAIN=2A OFFSET=84 AB-1-050/04 MGSC_0005 ab1fixes/ab1050/ab105004.img OFFSET=76 AB-1-055/04 MGSC_0005 ab1fixes/ab1055/ab105504.img OFFSET=71 AB-1-063/04 MGSC_0005 ab1fixes/ab1063/ab106304.img GAIN=4A OFFSET=56 AB-1-063/05 MGSC_0005 ab1fixes/ab1063/ab106305.img GAIN=4A OFFSET=56 AB-1-065/04 MGSC_0005 ab1fixes/ab1065/ab106504.img OFFSET=58 AB-1-065/05 MGSC_0005 ab1fixes/ab1065/ab106505.img qOFFSET=48 AB-1-072/04 MGSC_0005 ab1fixes/ab1072/ab107204.img GAIN=EA OFFSET=14 AB-1-074/04 MGSC_0005 ab1fixes/ab1074/ab107404.img OFFSET=56 AB-1-074/05 MGSC_0005 ab1fixes/ab1074/ab107405.img OFFSET=60 AB-1-088/04 MGSC_0005 ab1fixes/ab1088/ab108804.img GAIN=4A OFFSET=82 AB-1-095/05 MGSC_0005 ab1fixes/ab1095/ab109505.img GAIN=CA OFFSET=31 AB-1-096/04 MGSC_0005 ab1fixes/ab1096/ab109604.img OFFSET=65 AB-1-104/08 MGSC_0005 ab1fixes/ab1104/ab110408.img OFFSET=32 AB-1-108/05 MGSC_0005 ab1fixes/ab1108/ab110804.img OFFSET=20 AB-1-108/05 MGSC_0005 ab1fixes/ab1108/ab110805.img GAIN=6A OFFSET=40 AB-1-110/03 MGSC_0005 ab1fixes/ab1110/ab111003.img OFFSET=44 AB-1-111/03 MGSC_0005 ab1fixes/ab1111/ab111103.img GAIN=2A OFFSET=57 AB-1-112/03 MGSC_0005 ab1fixes/ab1112/ab111203.img OFFSET=32 AB-1-113/03 MGSC_0005 ab1fixes/ab1113/ab111303.img GAIN=8A OFFSET=14 AB-1-114/03 MGSC_0005 ab1fixes/ab1114/ab111403.img GAIN=8A OFFSET=13 AB-1-118/03 MGSC_0005 ab1fixes/ab1118/ab111803.img GAIN=4A OFFSET=44 NasaView 1.2(beta) - The Microsoft Windows version of NasaView, used to display PDS labeled image files, is unable to read a number of MGS/MOC image products due to a label handling problem. Whenever the NOTE keyword value exceeds 80 bytes in length, the label handling routine within NasaView is unable to parse the labels. Images with this problem can not be displayed. Newer vesions of NASAView correcting this problem can be obtained via the PDS home page at URL: http://pds.jpl.nasa.gov. The PDS standards require files to be labeled. The files INDEX.HTM, other html documents, MGS-LOGO.GIF, MSSS.GIF, and other jpeg images that make up the image browser have no PDS labels associated with the products. At the time of production of the MOC decompressed data products the most current version of the MISSION.CAT and INSTHOST.CAT files were used. These files have been subsequently updated. The LABEL_REVISION_NOTE keyword is missing in some catalog files. The AAREADME.TXT file contains a few errors as noted below: The directory tree lists /CATALOG/DSMAP.CAT but does not exist because there is no map projection information needed for raw image data. The directory tree lists /DOCUMENT/VOLINFO.LBL as an entry on the volume but does not exist (and is not required) for this volume. The directory tree does not list the existing file /INDEX/CUMINDEX.LBL. The files MGS_LOG.GIF, MSSS.GIF, and IMAP.GIF exists on the volume but do not show up in the directory tree. The VOLDESC.CAT file contains the keyword line "MEDIUM_TYPE=CD". CD is not a valid value. At the time of the production of the volume set it was not yet decided whether the media was to be CD-ROM or CD-WO (write once). So the generic term "CD" was used in spite of its non-valid value. The required keyword DATA_SET_REFERENCE_INFORMATION is missing in the DATASET.CAT file. In the label object PERSONNEL_INFORMATION of the PERSON.CAT file the required keywords INSTITUTION_NAME and PDS_ADDRESS_BOOK_FLAG are missing. PERSON_INSTITUTION_NAME should be changed to INSTITUTION_NAME. The required NOTE keyword is missing in labels for the ERRATA.TXT and MOCSIS.TXT files. The LINE_EXPOSURE_DURATION units value "MILLISECOND" should have had the designation . The MOCINST.CAT and REFS.CAT files contain tab characters (not allowed in PDS documentation files) located in the text. ================================================================= UPDATES FOR VOLUMES: The following corrections were made for the anomalies reported and can be obtained through the PDS Imaging Node web services at the URL: http://www-pdsimage.jpl.nasa.gov File: SP244306.IMG has been corrected to fix the label values for the PRODUCT_ID and FILE_NAME File: SP244503.IMG has been corrected to have the correct label values for the PRODUCT_ID and FILE_NAME Files: IMGINDX.LBL and CUMINDX.LBL have been corrected to remove the the double quotes in the SOLAR_LONGITUDE description field. File: CUMINDX.TAB for volume MGSC_0010 has been corrected for the incorrect entries for image files SP244306.IMG and SP244503.IMG, and the 714-th record has been modified to have the correct record length. The CUMINDX.TAB file is the cumulative index for all images in the 10 volume collection, so only this file was corrected. By downloading this file you will have an up-to-date index file for all images. Files: DATASET.CAT, INSTHOST.CAT MISSION.CAT, MOCINST.CAT, PERSON.CAT, REFS.CAT - Minor syntactical revisions have been made to these files to correct for the problems noted above. File: ERRATA.TXT - look for the most up-to-date ERRATA.TXT file on our web site for additional anamolies that are discovered. File: AAREADME.TXT - minor revisions made to this file to correct for the problems noted above.