MESSENGER MASCS UVVS+VIRS Combined Derived Data Record Specification Version 3.0 March 30, 2017 Prepared by: Noam Izenberg Applied Physics Laboratory Jennifer Ward PDS Geosciences Node Washington University Document Review This document and the archive it describes have been through PDS Peer Review and have been accepted into the PDS archive. William McClintock, MESSENGER Cognizant Co-Investigator/MASCS, has reviewed and approved this document. Noam Izenberg, MESSENGER MASCS Instrument Scientist, has reviewed and approved this document. Lyle Huber, PDS Atmospheres Node Representative, has reviewed and approved this document. Susan Ensor, MESSENGER Science Operations Center Lead, has reviewed and approved this document. Document Change History Revision Number Revision Date Author Section Remarks 1.0 8/22/16 N. Izenberg, J. Ward All Initial Document. 2.0 1/23/17 N. Izenberg, J. Ward 5.2.2, Appendix A, B Response to PDS review. Changed one DQI field and added Appendix B. 3.0 3/30/17 J. Ward Appendix A, 5.3.1 Fixed errors in format file. Added mission phase to file naming convention. Table of Contents 1. Purpose and Scope of Document 1.1 Purpose 1.2 Scope 2. Applicable Documents 3. Relationships with other Interfaces 4. Roles and Responsibilities 5. Data Product Characteristics and Environment 5.1 Instrument Overview 5.2 Data Product Overview 5.2.1 UVVS and VIRS DDRs 5.2.2 UVVS+VIRS Combined DDRs 5.3 Data Processing 5.3.1 Labeling and Identification 5.3.1.1 Example PDS Label for the UVVS+VIRS Combined Spectrum 5.4 Data Format Description 5.5 Data Location 6. Appendices APPENDIX A- UVVSVIRSD.FMT FILE APPENDIX B- MASCS Data Product Summary 1. Purpose and Scope of Document 1.1 Purpose This document provides users of the MESSENGER MASCS Ultraviolet and Visible Spectrometer (UVVS) and Visible and Infrared Spectrograph (VIRS) data products with a detailed description of the UVVS+VIRS Combined Spectrum Derived Data Record (DDR) product generation and storage. The UVVS+VIRS combined data products are deliverables to the Planetary Data System (PDS) and the scientific community that it supports. All data formats are compliant with PDS standards. In addition, this Specification documents the format and location of the DDR in the MESSENGER MASCS CDR/DDR/DAP PDS archive volume (VOLUME_ID = MESSMAS_2101). 1.2 Scope This Specification is useful to those who wish to understand the format and content of the UVVS+VIRS combined DDR data products. Typically, these individuals include data analysts and planetary scientists. The Specification applies to DDR data products produced during the course of MESSENGER mission operations. Calibrated Data Records (CDRs), other DDRs, and Derived Analysis Products (DAPs) from MASCS UVVS and VIRS are addressed in the UVVS CDR/DDR SIS and the VIRS CDR/DDR/DAP SIS [Applicable Documents 8 and 9]. EDR data products are archived in a separate PDS archive volume. 2. Applicable Documents This SIS references the following documents: 1. MESSENGER Mercury: Surface, Space Environment, Geochemistry, Ranging; A mission to Orbit and Explore the Planet Mercury, Concept Study, March 1999. Document ID number FG632/ 99-0479. 2. Planetary Data System Archive Preparation Guide, NASA/JPL, August 29, 2006, Version 1.1, JPL D-31224. 3. Planetary Data System Standards Reference, NASA/JPL, March 20, 2006, Version 3.7, JPL D-7669, Part-2. 4. MESSENGER Data Management and Archiving Plan. The Johns Hopkins University, APL. Document ID number 7384-9019. 5. [PLR] Appendix 7 to the discovery program Plan; Program Level Requirement for the MESSENGER Discovery project; June 20, 2001. 6. MASCS Users Guide. Laboratory for Atmospheric and Space Physics, University of Colorado. Document ID number 20580-T5-5103. 7. Instrument Calibration Report. Mercury Atmospheric and Surface Composition Spectrometer (MASCS) on the Mercury: Surface, Space Environment, Geochemistry, Ranging (MESSENGER) Mission. LASP/CU Document Number 20580-T6-7915. 8. MESSENGER MASCS UVVS Calibrated and Derived Data Record Software Interface Specification, Version 5.5, March 30, 2017, PDS VOLUME_ID: MESSMAS_2101. 9. MESSENGER MASCS VIRS Calibrated Data Record, Derived Data Record, and Derived Analysis Product Software Interface Specification, Version 5.2, March 30, 2017, PDS VOLUME_ID: MESSMAS_2101. 10. MASCS Instrument Paper: W. E. McClintock and M. R. Lankton (2007) Space Sci. Rev. 131, 481-522. 3. Relationships with other Interfaces The UVVS and VIRS data products are stored on hard disk and in an SQL (Structured Query Language) relational database for rapid mission access during mission operations. The data products are electronically transferred to the PDS Geosciences and Atmospheres Nodes according to the delivery schedule in the MESSENGER Data Management and Archiving Plan [Applicable Document 4]. The UVVS and VIRS CDRs, DDRs, and DAPs contain some data that are useful in cross-comparison, therefore both the UVVS and VIRS CDRs/DDRs/DAPs are grouped together in the MASCS CDR/DDR/DAP archive volume stored at both PDS nodes. 4. Roles and Responsibilities The roles and responsibilities of the instrument teams, Applied Physics Laboratory (APL), Applied Coherent Technology Corporation (ACT), and the PDS are defined in the MESSENGER Data Management and Archiving Plan [Applicable Document 4]. 5. Data Product Characteristics and Environment 5.1 Instrument Overview Refer to UVVS_CDR_DDR_SIS.PDF and VIRS_CDR_DDR_DAP_SIS.PDF in the DOCUMENT directory of this volume. 5.2 Data Product Overview Please see Appendix B for a summary table of all MASCS data products. 5.2.1 UVVS and VIRS DDRs For UVVS and VIRS DDRs, see UVVS_CDR_DDR_SIS.PDF and VIRS_CDR_DDR_DAP_SIS.PDF in the DOCUMENT directory of this volume. 5.2.2 UVVS+VIRS Combined DDRs The UVVS+VIRS DDRs consist of derived data from UVVS' middle ultraviolet (MUV) photomultiplier tube, and VIRS. Spatially proximate UVVS and VIRS spectra are combined to create a single extended wavelength surface reflectance spectrum from 210 nm to 1450 nm. The combination is conducted by software that locates automatically or with human assistance, the closest best matching VIRS spectrum to a given UVVS spectrum, and combines the two data sets into a single spectrum for that location. The UVVS+VIRS Combined +DDR data product contains all the data from one observation pair (matched UVVS and VIRS observations). One observation pair is associated with one DDR data product showing derived science data (photometrically corrected surface reflectance), and location information for each wavelength bin of a UVVS surface observation and the corresponding VIRS observation. The DDRs are in binary table format, and each is described by a detached PDS label. The label files define source DDR files, the time of acquisition of the UVVS observation, product creation time, etc. The label points to an associated format file that defines the fields of the binary table contained within the data file. The combined spectrum contains footprint information similar to that shown in Figure 1, and spectrum information similar to that shown in Figure 2. Figure 1. UVVS footprint of UVVS-VIRS Combined DDR is shown projected on an image mosaic background. The blue parallelogram represents the location of the first wavelength (210 nm) of the UVVS spectrum. The red shows the location of the last wavelength (300 nm). The cyan footprint represents the coordinate points of the VIRS footprint associated with the combined spectrum. Information on the source observations for UVVS and VIRS is also listed, and included in the DDR. See PDF version of document for figure. Figure 2. Combined spectrum data from UVVS and VIRS. UVVS reflectance is shown in black, VIRS (up to 840 nm) is shown in cyan. A mean Mercury spectrum for the southern hemisphere is shown in orange. See PDF version of document for figure. Components of the UVVS+VIRS Combined DDR include: Component File IDs 1. UVVS Header File ID 2. UVVS Science File ID 3. VIRS VIS File ID 4. VIRS NIR File ID These are the individual DDR files from which spectral and other information is extracted to make the combined DDR. VIRS spectrum number 5. VIRS Spectrum Number (derived/selected by automated/human matching) (int) VIRS observations may have dozens to thousands of individual spectra. This field denotes the spectrum number from the matching observation that is the closest/best match to the UVVS spectrum of the DDR. UVVS derived footprint parameters 6. UVVS drift distance 7. UVVS smear as a % of footprint size Drift is the ground distance in km between the center of the UVVS footprint of the first wavelength of the observation (blue in Fig. 1) to the last wavelength (red in Fig. 1). Smear is the drift distance scaled to the size of the UVVS footprint, determined by the average size (in km) of two adjacent sides of the footprint parallelogram. UVVS footprint parameters for all UVVS wavelengths 8. Lat, Lon coordinates of UVVS spectral footprints (center and 4 corners - C0, C1, C2, C3, C4) a. Lat Center (C0) b. Lat Corner 1 (C1) c. Lat Corner 2 (C2) d. Lat Corner 3 (C3) e. Lat Corner 4 (C4) f. Lon Center (C0) g. Lon Corner 1 (C1) h. Lon Corner 2 (C2) i. Lon Corner 3 (C3) j. Lon Corner 4 (C4) Copied from the UVVS DDR. The UVVS spectrum is in 46 wavelength bins, each with its own footprint coordinates. VIRS footprint parameters for VIRS spectrum 9. Lat, Lon coordinates of VIRS spectral footprint (center, and points describing the VIRS ovoid - C0, C1, C2, C3, C4) a. Lat ovoid coordinates (C0, C1, C2, C3, C4) b. Lon ovoid coordinates (C0, C1, C2, C3, C4) Copied from the VIRS DDR. Spatial relation between UVVS and VIRS footprints 10. Distance in km from center coordinates of UVVS to center coordinates of VIRS 11. Distance % of footprint size from center coordinates of UVVS to center coordinates of VIRS Center to center distance between UVVS and VIRS in km and as a percentage of the UVVS footprint size - similar to component 7. Photometric angles of the observation 12. Average i, e, phase UVVS (copied from UVVS SCI DDR of central wavelength) (3xfloat) 13. Average i, e, phase VIRS (copied from VIRS DDR) (3xfloat) For UVVS, the incidence (i), emission (e) and phase angles (a) are taken from the central wavelength (256 nm) footprint. Both UVVS and VIRS are normalized to i=45, e=45, a=90 deg. Quality factors for spectrum 14. "Goodness" of Match 15. DQI (7xstring) a. Hot UVVS (0 = No, 1 = Yes, threshold of 35C) b. Hot VIRS (0 = No, 1 = Yes, threshold of 50C) c. AltVIRS (0 = No, 1 = Yes, derived/selected by automated/human matching) d. Secondary AltVIRS ((0 = No, 1 = Yes, selected by human matching) e. VIRS Binning (0 = unbinned, 1 = binned by 2) f. UVVS Footprint Heterogeneity g. Spare Goodness of match UVVS reflectance at 300 nm ratioed to VIRS reflectance at 300 nm, with 1.00 being perfect match). Data Quality Indices (DQIs) a and b represent whether UVVS or VIRS detectors exceed levels that potentially affect data quality. DQIs c and d denote whether the VIRS observation chosen to match UVVS is not contemporaneous with the UVVS observation: Many - but not all - of the UVVS observations have contemporaneous VIRS observations at almost identical viewing geometries. However, not all do, and the ones that don't need the "closest, best" VIRS spectrum match found by hand. The "AltVIRS" DQI numbers indicate if such an alternative VIRS spectrum was needed, and whether it is the absolute closest possible VIRS spectrum (in terms of distance in km from center coordinates of UVVS to center coordinates of VIRS) or the best spectral match, which will be proximate, but not necessarily the closest. DQI f is qualitative heterogeneity of UVVS footprint, graded, "0", "1", "2", or "3". A 1 indicates that the UVVS footprint, even if it smeared over a large area, is located on a uniform landscape. A 2 indicates that there are some small craters/ridges/etc. in the area covered by the observation, or the terrain changes between the start and end footprint of the individual UVVS footprint steps. A 3 indicates large craters/ridges/variation in the area covered by the observation or that one entire starting or ending step footprint is located on a different type of terrain. A "0" indicates no evaluation was made. Spectrum Information 16. Wavelength file of combined spectrum 17. Photometrically corrected reflectance values of combined spectrum 18. Photometrically corrected reflectance noise values of combined spectrum The combined UVVS+VIRS spectrum, with noise and wavelengths, in 504 wavelength bins. Spares 19. 4 x Spare (4 fields, 1xfloat each) Items 6-14, and DQI are all useful for filtering the dataset for desired qualities before reading in any spectra. 5.3 Data Processing The UVVS+VIRS Combined DDR is a level 4 product as defined by the Committee on Data Management and Computation. The DDR files were produced by the MESSENGER Science Operations Center (SOC), operated jointly by APL and ACT. The DDR data products were made available to the MESSENGER Science Team for initial evaluation and validation. At the end of the evaluation and validation period, the data were organized, stored, and transmitted with other DDRs as described in the respective SIS documents. 5.3.1 Labeling and Identification Labeling of the UVVS+VIRS Combined DDR conforms to the PDS version 3 standards. For more information on this standard consult the PDS Standards Reference JPL D-7669 Document [Applicable Document 3]. The purpose of the PDS label is to describe the data product and provide ancillary information about the data product. UVVS+VIRS Combined DDR data products have the form "UVVSVIRSD_mmm_YYDOY_HHMMSS", where mmm is the mission phase [Mercury Orbit (ORB) through Mercury Orbit Year 5 (OB5)], YYDOY are the year and day of year, and HHMMSS are the hour, minute, second designations taken from the source UVVS observation of each data set. 5.3.1.1 Example PDS Label for the UVVS+VIRS Combined Spectrum PDS_VERSION_ID = "PDS3" /*** FILE FORMAT ***/ RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 10485 FILE_RECORDS = 1 /*** GENERAL DATA DESCRIPTION PARAMETERS ***/ PRODUCT_ID = "UVVSVIRSD_OB4_14176_041429_DAT" PRODUCT_VERSION_ID = "V1 " PRODUCT_CREATION_TIME = 2016-07-26T13:22:44 PRODUCT_TYPE = "DDR" SOFTWARE_NAME = "PIPE-MASCS2DDR" SOFTWARE_VERSION_ID = "1.0" INSTRUMENT_HOST_NAME = "MESSENGER" INSTRUMENT_NAME = " MERCURY ATMOSPHERIC AND SURFACE COMPOSITION SPECTROMETER" INSTRUMENT_ID = "MASCS" DETECTOR_ID = {"UVVS","VIRS"} DATA_SET_ID = "MESS-E/V/H-MASCS-4-UVVS/VIRS-DDR-V1.0" STANDARD_DATA_PRODUCT_ID = "UVVSVIRSD" MISSION_PHASE_NAME = "MERCURY ORBIT YEAR 4" TARGET_NAME = "MERCURY" OBSERVATION_TYPE = "Joint UVVS - VIRS" START_TIME = "N/A" STOP_TIME = "N/A" SPACECRAFT_CLOCK_START_COUNT = "N/A" SPACECRAFT_CLOCK_STOP_COUNT = "N/A" ^TABLE = "UVVSVIRSD_OB4_14176_041429.DAT" OBJECT = TABLE COLUMNS = 32 INTERCHANGE_FORMAT = BINARY ROW_BYTES = 10485 ROWS = 1 DESCRIPTION = " Detailed descriptions for the parameters defined below are contained in UVVS_VIRS_COMBINED_DDR_SPEC.PDF located in the DOCUMENT directory of the MASCS CDR/DDR/DAP archive volume. The complete column definitions are contained in an external file found in the LABEL directory of the archive volume. " ^STRUCTURE = "UVVSVIRSD.FMT" END_OBJECT = TABLE END 5.4 Data Format Description Data are stored in binary table format. Detached PDS labels provide detailed descriptions of the structure of the tables. 5.5 Data Location The UVVS+VIRS data products are located in the UVVS_VIRS_COMBINED folder on the MASCS CDR/DDR/DAP archive volume. See section 6.1.3 of UVVS_CDR_DDR_SIS.PDF and VIRS_CDR_DDR_DAP_SIS.PDF for the full directory structure. 6. Appendices APPENDIX A- UVVSVIRSD.FMT FILE OBJECT = COLUMN NAME = UVVS_HDR_DDR_NAME COLUMN_NUMBER = 1 BYTES = 31 DATA_TYPE = CHARACTER START_BYTE = 1 DESCRIPTION = "Name of the UVVS Surface DDR Header File from which UVVS header data were extracted." END_OBJECT = COLUMN OBJECT = COLUMN NAME = UVVS_SCI_DDR_NAME COLUMN_NUMBER = 2 BYTES = 31 DATA_TYPE = CHARACTER START_BYTE = 32 DESCRIPTION = "Name of the UVVS Surface DDR Science File from which UVVS science data were extracted." END_OBJECT = COLUMN OBJECT = COLUMN NAME = VIRS_VIS_DDR_NAME COLUMN_NUMBER = 3 BYTES = 27 DATA_TYPE = CHARACTER START_BYTE = 63 DESCRIPTION = "Name of the VIRS VIS DDR File from which VIRS VIS data were extracted." END_OBJECT = COLUMN OBJECT = COLUMN NAME = VIRS_NIR_DDR_NAME COLUMN_NUMBER = 4 BYTES = 27 DATA_TYPE = CHARACTER START_BYTE = 90 DESCRIPTION = "Name of the VIRS NIR DDR File from which VIRS NIR data were extracted." END_OBJECT = COLUMN OBJECT = COLUMN NAME = VIRS_SPECTRUM_NUMBER COLUMN_NUMBER = 5 BYTES = 2 DATA_TYPE = MSB_UNSIGNED_INTEGER START_BYTE = 117 DESCRIPTION = "VIRS Spectrum Number." END_OBJECT = COLUMN OBJECT = COLUMN NAME = UVVS_DRIFT COLUMN_NUMBER = 6 BYTES = 8 DATA_TYPE = IEEE_REAL START_BYTE = 119 MISSING_CONSTANT = -1.E32 DESCRIPTION = "UVVS drift Distance from first to last step. Unit = km." END_OBJECT = COLUMN OBJECT = COLUMN NAME = UVVS_SMEAR COLUMN_NUMBER = 7 BYTES = 8 DATA_TYPE = IEEE_REAL START_BYTE = 127 MISSING_CONSTANT = -1.E32 DESCRIPTION = "UVVS smear as a percentage of footprint size." END_OBJECT = COLUMN OBJECT = COLUMN NAME = UVVS_TARGET_LATITUDE_C0 COLUMN_NUMBER = 8 BYTES = 368 DATA_TYPE = IEEE_REAL START_BYTE = 135 ITEMS = 46 ITEM_BYTES = 8 MISSING_CONSTANT = -1.E32 DESCRIPTION = "This indicates the UVVS BIN-average latitudes at the locations where the field-of-view center and corners intersect the planet surface. Format: (center, corner 1, corner 2, corner 3, corner 4). Unit = degrees." END_OBJECT = COLUMN OBJECT = COLUMN NAME = UVVS_TARGET_LATITUDE_C1 COLUMN_NUMBER = 9 BYTES = 368 DATA_TYPE = IEEE_REAL START_BYTE = 503 ITEMS = 46 ITEM_BYTES = 8 MISSING_CONSTANT = -1.E32 DESCRIPTION = "This indicates the UVVS BIN-average latitudes at the locations where the field-of-view center and corners intersect the planet surface. Format: (center, corner 1, corner 2, corner 3, corner 4). Unit = degrees." END_OBJECT = COLUMN OBJECT = COLUMN NAME = UVVS_TARGET_LATITUDE_C2 COLUMN_NUMBER = 10 BYTES = 368 DATA_TYPE = IEEE_REAL START_BYTE = 871 ITEMS = 46 ITEM_BYTES = 8 MISSING_CONSTANT = -1.E32 DESCRIPTION = "This indicates the UVVS BIN-average latitudes at the locations where the field-of-view center and corners intersect the planet surface. Format: (center, corner 1, corner 2, corner 3, corner 4). Unit = degrees." END_OBJECT = COLUMN OBJECT = COLUMN NAME = UVVS_TARGET_LATITUDE_C3 COLUMN_NUMBER = 11 BYTES = 368 DATA_TYPE = IEEE_REAL START_BYTE = 1239 ITEMS = 46 ITEM_BYTES = 8 MISSING_CONSTANT = -1.E32 DESCRIPTION = "This indicates the UVVS BIN-average latitudes at the locations where the field-of-view center and corners intersect the planet surface. Format: (center, corner 1, corner 2, corner 3, corner 4). Unit = degrees." END_OBJECT = COLUMN OBJECT = COLUMN NAME = UVVS_TARGET_LATITUDE_C4 COLUMN_NUMBER = 12 BYTES = 368 DATA_TYPE = IEEE_REAL START_BYTE = 1607 ITEMS = 46 ITEM_BYTES = 8 MISSING_CONSTANT = -1.E32 DESCRIPTION = "This indicates the UVVS BIN-average latitudes at the locations where the field-of-view center and corners intersect the planet surface. Format: (center, corner 1, corner 2, corner 3, corner 4). Unit = degrees." END_OBJECT = COLUMN OBJECT = COLUMN NAME = UVVS_TARGET_LONGITUDE_C0 COLUMN_NUMBER = 13 BYTES = 368 DATA_TYPE = IEEE_REAL START_BYTE = 1975 ITEMS = 46 ITEM_BYTES = 8 MISSING_CONSTANT = -1.E32 DESCRIPTION = "This indicates the UVVS BIN-average longitudes at the locations where the field-of-view center and corners intersect the planet surface. Format: (center, corner 1, corner 2, corner 3, corner 4). Unit = degrees." END_OBJECT = COLUMN OBJECT = COLUMN NAME = UVVS_TARGET_LONGITUDE_C1 COLUMN_NUMBER = 14 BYTES = 368 DATA_TYPE = IEEE_REAL START_BYTE = 2343 ITEMS = 46 ITEM_BYTES = 8 MISSING_CONSTANT = -1.E32 DESCRIPTION = "This indicates the UVVS BIN-average longitudes at the locations where the field-of-view center and corners intersect the planet surface. Format: (center, corner 1, corner 2, corner 3, corner 4). Unit = degrees." END_OBJECT = COLUMN OBJECT = COLUMN NAME = UVVS_TARGET_LONGITUDE_C2 COLUMN_NUMBER = 15 BYTES = 368 DATA_TYPE = IEEE_REAL START_BYTE = 2711 ITEMS = 46 ITEM_BYTES = 8 MISSING_CONSTANT = -1.E32 DESCRIPTION = "This indicates the UVVS BIN-average longitudes at the locations where the field-of-view center and corners intersect the planet surface. Format: (center, corner 1, corner 2, corner 3, corner 4). Unit = degrees." END_OBJECT = COLUMN OBJECT = COLUMN NAME = UVVS_TARGET_LONGITUDE_C3 COLUMN_NUMBER = 16 BYTES = 368 DATA_TYPE = IEEE_REAL START_BYTE = 3079 ITEMS = 46 ITEM_BYTES = 8 MISSING_CONSTANT = -1.E32 DESCRIPTION = "This indicates the UVVS BIN-average longitudes at the locations where the field-of-view center and corners intersect the planet surface. Format: (center, corner 1, corner 2, corner 3, corner 4). Unit = degrees." END_OBJECT = COLUMN OBJECT = COLUMN NAME = UVVS_TARGET_LONGITUDE_C4 COLUMN_NUMBER = 17 BYTES = 368 DATA_TYPE = IEEE_REAL START_BYTE = 3447 ITEMS = 46 ITEM_BYTES = 8 MISSING_CONSTANT = -1.E32 DESCRIPTION = "This indicates the UVVS BIN-average longitudes at the locations where the field-of-view center and corners intersect the planet surface. Format: (center, corner 1, corner 2, corner 3, corner 4). Unit = degrees." END_OBJECT = COLUMN OBJECT = COLUMN NAME = VIRS_TARGET_LATITUDE_SET COLUMN_NUMBER = 18 BYTES = 40 DATA_TYPE = IEEE_REAL START_BYTE = 3815 ITEMS = 5 ITEM_BYTES = 8 MISSING_CONSTANT = -1.E32 INVALID_CONSTANT = 1.E32 DESCRIPTION = "Derived latitude of VIRS footprint center, uprange edge (c1), downrange edge (c2), port, (c3) and starboard (c4) edges (5 total values, coordinates as in Figure 4 of VIRS_CDR_DDR_DAP_SIS.PDF; center point, c1, c2, c3, c4) on planet target corresponding to spectral observation. Unit = degrees." END_OBJECT = COLUMN OBJECT = COLUMN NAME = VIRS_TARGET_LONGITUDE_SET COLUMN_NUMBER = 19 BYTES = 40 DATA_TYPE = IEEE_REAL START_BYTE = 3855 ITEMS = 5 ITEM_BYTES = 8 MISSING_CONSTANT = -1.E32 INVALID_CONSTANT = 1.E32 DESCRIPTION = "Derived longitude of VIRS footprint center, uprange edge (c1), downrange edge (c2), port, (c3) and starboard (c4) edges (5 total values, coordinates as in Figure 4 of VIRS_CDR_DDR_DAP_SIS.PDF; center point, c1, c2, c3, c4) on planet target corresponding to spectral observation. Unit = degrees. PER SPECTRUM column." END_OBJECT = COLUMN OBJECT = COLUMN NAME = VIRS_UVVS_CENTER_DISTANCE COLUMN_NUMBER = 20 BYTES = 8 DATA_TYPE = IEEE_REAL START_BYTE = 3895 MISSING_CONSTANT = -1.E32 DESCRIPTION = "Distance from center coordinates of UVVS to center coordinates of VIRS. Unit = km." END_OBJECT = COLUMN OBJECT = COLUMN NAME = VIRS_UVVS_OFFSET_PERCENTAGE COLUMN_NUMBER = 21 BYTES = 8 DATA_TYPE = IEEE_REAL START_BYTE = 3903 MISSING_CONSTANT = -1.E32 DESCRIPTION = "Distance percentage of footprint size from center coordinates of UVVS to center coordinates of VIRS." END_OBJECT = COLUMN OBJECT = COLUMN NAME = UVVS_CENTER_PHOT_ANGLES COLUMN_NUMBER = 22 BYTES = 24 DATA_TYPE = IEEE_REAL START_BYTE = 3911 ITEMS = 3 ITEM_BYTES = 8 MISSING_CONSTANT = -1.E32 DESCRIPTION = "Average incidence, emission and phase UVVS angles. Unit = degrees." END_OBJECT = COLUMN OBJECT = COLUMN NAME = VIRS_CENTER_PHOT_ANGLES COLUMN_NUMBER = 23 BYTES = 24 DATA_TYPE = IEEE_REAL START_BYTE = 3935 ITEMS = 3 ITEM_BYTES = 8 MISSING_CONSTANT = -1.E32 DESCRIPTION = "Average incidence, emission and phase VIRS angles. Unit = degrees." END_OBJECT = COLUMN OBJECT = COLUMN NAME = VIRS_UVVS_MATCH COLUMN_NUMBER = 24 BYTES = 8 DATA_TYPE = IEEE_REAL START_BYTE = 3959 MISSING_CONSTANT = -1.E32 DESCRIPTION = "'Goodness of Match': (VIRS photometrically corrected reflectance at 300 nm )/ (UVVS photometrically corrected reflectance at 300 nm) Where 1.00 is a perfect match." END_OBJECT = COLUMN OBJECT = COLUMN NAME = DATA_QUALITY_INDEX COLUMN_NUMBER = 25 BYTES = 7 DATA_TYPE = CHARACTER START_BYTE = 3967 DESCRIPTION = "7 character index of data quality. Each digit signifies quality factor of measurements. Format: ABCDEFG A: Hot UVVS (threshold) 0 = Temperature does not exceed 50 deg C 1 = Temperature exceeds 50 deg C B: Hot VIRS (threshold) 0 = Temperature does not exceed 35 deg C threshold. 1 = Temperature exceeds 35 deg C threshold. C: AltVIRS 0 = UVVS and VIRS are near contemporaneous. 1 = UVVS and VIRS are not contemporaneous. Best, closest overlapping VIRS observation matched with UVVS D: Secondary AltVIRS (not closest, but best) 0 = Default 1 = UVVS and VIRS are not contemporaneous. Best overlapping VIRS observation matched with UVVS - but NOT geographically closest. E: VIRS Binning 0 = No VIRS binning (i.e. binned by 1) 1 = VIRS spectrum binned by 2, rebinned to full-size in DDR. F: UVVS Footprint Heterogeneity 0 = No evaluation 1 = Footprint on uniform landscape 2 = Small craters or topography variation within UVVS footprint 3 = Large craters or topographic variation within UVVS footprint G: Spare." END_OBJECT = COLUMN OBJECT = COLUMN NAME = FULLSPEC_WAVELENGTHS COLUMN_NUMBER = 26 BYTES = 2160 DATA_TYPE = IEEE_REAL START_BYTE = 3974 ITEMS = 540 ITEM_BYTES = 4 DESCRIPTION = "Wavelength file of combined spectrum: 46 UVVS wavelengths, 494 VIRS wavelengths." END_OBJECT = COLUMN OBJECT = COLUMN NAME = FULLSPEC_PHOTOM_IOF_DATA COLUMN_NUMBER = 27 BYTES = 2160 DATA_TYPE = IEEE_REAL START_BYTE = 6134 ITEMS = 540 ITEM_BYTES = 4 INVALID_CONSTANT = 1.E32 DESCRIPTION = "Photometrically corrected reflectance values of combined spectrum: 46 UVVS wavelengths, 494 VIRS wavelengths." END_OBJECT = COLUMN OBJECT = COLUMN NAME = FULLSPEC_PHOTOM_IOF_NOISE_DATA COLUMN_NUMBER = 28 BYTES = 2160 DATA_TYPE = IEEE_REAL START_BYTE = 8294 ITEMS = 540 ITEM_BYTES = 4 INVALID_CONSTANT = 1.E32 DESCRIPTION = "Photometrically corrected reflectance noise of combined spectrum: 46 UVVS wavelengths, 494 VIRS wavelengths." END_OBJECT = COLUMN /* SPARE COLUMNS */ OBJECT = COLUMN NAME = SPARE_1 COLUMN_NUMBER = 29 BYTES = 8 DATA_TYPE = IEEE_REAL START_BYTE = 10454 DESCRIPTION = "SPARE column." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SPARE_2 COLUMN_NUMBER = 30 BYTES = 8 DATA_TYPE = IEEE_REAL START_BYTE = 10462 DESCRIPTION = "SPARE column." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SPARE_3 COLUMN_NUMBER = 31 BYTES = 8 DATA_TYPE = IEEE_REAL START_BYTE = 10470 DESCRIPTION = "SPARE column." END_OBJECT = COLUMN OBJECT = COLUMN NAME = SPARE_4 COLUMN_NUMBER = 32 BYTES = 8 DATA_TYPE = IEEE_REAL START_BYTE = 10478 DESCRIPTION = "SPARE column." END_OBJECT = COLUMN APPENDIX B- MASCS Data Product Summary See PDF version of document for table.