Data Set Information
DATA_SET_NAME FIELD EXP E SIRIS RESAMP REDUCED DATA RECORD SPECTRUM V1.0
DATA_SET_ID FEXP-E-SIRS-4-RDR-SPECTRUM-V1.0
NSSDC_DATA_SET_ID
DATA_SET_TERSE_DESCRIPTION
DATA_SET_DESCRIPTION Data Set Overview : The SIRIS measurement objectives were: 1) to measure reflectance spectra of a bright and dark target at each GRSFE site for potential use in AVIRIS calibration; 2) to fully characterize selected sites at the GRSFE modeling site (Lunar Lake, NV) using visible/infrared reflectance; 3) to collect reflectance spectra for selected endmember materials at each of the GRSFE sites; and 4) to make reflectance measurements for inter-instrument calibration. Visible/Infrared field spectral measurements using the SIRIS were made on 15-19 July. The SIRIS was set up with standardized geometry; a nadir view from 75 cm above the ground surface, facing towards the sun. Undisturbed surfaces were measured including rock outcrops, surface coatings where present, and soils. All measurements were made using the HALON standard, which makes conversion to absolute reflectance based on NBS standard HALON possible. This conversion was not routinely performed for the SIRIS data and all spectra provided for GRSFE are relative to HALON. No additional SIRIS measurements were made for September AVIRIS flights. SIRIS spectra were reduced to reflectance using software provided by GER. This procedure consists of simple division of the sample radiance spectrum by the reference radiance spectrum. The GER grating-match adjustment was applied to correct for offsets at the grating boundaries and grating overlaps were removed by deleting overlap channels. Previous experience with the instrument and inspection of raw data plots indicated that noisy channels between 1.32 - 1.42 micrometers and 1.78 - 1.95 micrometers should be deleted. Deleted points were coded as 9.99999999. Spectra for some measurement sites were discarded completely because of excess noise and other problems. Spectra were measured at Kelso Dunes on 15 July 1989 along the road and parking lot south of the sand dunes in the center of the valley. These measurements were averaged to constitute the Bright Target. The Dark Target measurement is the average of two spectra taken of the gravel at the power station along the main KelBaker road. Spectra were measured at the Cima Volcanic Field on 15 July 1989 for basalt and basalt gravel and averaged as the Dark Target. The average of two stream wash spectra constitute the Bright Target. Spectra were measured at Lunar Crater Volcanic Field periodically throughout the day of 17 July, 1989 for the playa, disturbed playa surface, and cobble modeling sites. Spectra of a Dark Target (basalt gravel) and Bright Target (small playa surface) were measured on 19 July 1989 at Ubehebe Crater. Spectra of additional targets were not measured because of rapidly changing, cloudy, weather conditions. Spectra of the Trail Canyon fan in Death Valley, the salt flat in the center of Devil's Golf Course adjacent to the fan, and sand dunes near Stovepipe Wells were measured on 18 July 1989. Measurements made with the SIRIS at the Lunar Lake modeling site for comparison of instrument response. These measurements were made using the JPL SPECTRALON plate as a reference standard. Processing Level Id : 4 Software Flag : N Processing Start Time : 1989-07-20T00:00:00.000 Processing Stop Time : 1991-05-28T00:00:00.000 Parameters : Data Set Parameter 'REFLECTANCE' -------------------------------- The ratio of radiance scattered from a surface to the irradiance incident on the surface. Data Set Parameter Name : REFLECTANCE Data Set Parameter Unit : N/A Sampling Parameter Name : WAVELENGTH Sampling Parameter Unit : MICROMETER Minimum Sampling Parameter : 0.4 Maximum Sampling Parameter : 2.5 Sampling Parameter Resolution : 0.0019 Sampling Parameter Interval : 0.0019 Minimum Available Sampling Int : N/A Noise Level : UNK Source Instrument Parameters : Instrument Host ID : FEXP Data Set Parameter Name : REFLECTANCE Instrument Parameter Name : RADIANCE Important Instrument Parameters : 1 Measurement Information : Atmospheric Conditions ---------------------- Not Applicable Source ------ Sunlight reflected from the material of interest. Calibration Standard -------------------- Spectra are typically measured using solar illumination and HALON as a reflectance standard. HALON is a highly reflective material with no absorption features in the 0.4 to 2.5 micrometer range (Weidner and Hsia, 1981). Wavelength Calibration ---------------------- Unknown Processing : Processing History ------------------ Source Data Set ID : N/A Software : UNK Product Data Set ID : FEXP-E-SIRS-4-RDR-SPECTRUM-V1.0
DATA_SET_RELEASE_DATE 1991-05-28T00:00:00.000Z
START_TIME 1989-07-15T06:30:00.000Z
STOP_TIME 1989-07-19T05:40:00.000Z
MISSION_NAME GEOLOGIC REMOTE SENSING FIELD EXPERIMENT
MISSION_START_DATE 1989-07-01T12:00:00.000Z
MISSION_STOP_DATE 1989-10-31T12:00:00.000Z
TARGET_NAME EARTH
TARGET_TYPE PLANET
INSTRUMENT_HOST_ID FEXP
INSTRUMENT_NAME SINGLE BEAM VIS/IR INTEL SPECTRORADIOMTR
INSTRUMENT_ID SIRS
INSTRUMENT_TYPE SPECTROMETER
NODE_NAME Geosciences
ARCHIVE_STATUS ARCHIVED
CONFIDENCE_LEVEL_NOTE Overview : Several instrument artifacts (or atmospheric bands) are apparent in the SIRIS data. First, there are small instrument glitches near 0.6, 0.76, 0.93, 1.06, and 1.49 micrometers. Secondly, there are commonly prominent CO2 absorption features near 2.005 and 2.05 micrometers that are probably caused by changing atmospheric conditions between measurement of the reference and the sample spectra. Spectra measured with the SIRIS in the lab for the Lunar Lake materials do not show many of these features.
CITATION_DESCRIPTION Kruse, F. A., FIELD EXP E SIRIS RESAMP REDUCED DATA RECORD SPECTRUM V1.0, FEXP-E-SIRS-4-RDR-SPECTRUM-V1.0, NASA Planetary Data System, 1991
ABSTRACT_TEXT The SIRIS measurement objectives were: 1) to measure reflectance spectra of a bright and dark target at each GRSFE site for potential use in AVIRIS calibration characterize selected sites at the GRSFE modeling site (Lunar Lake, NV) using visible/infrared reflectance reflectance spectra for selected endmember materials at each of the GRSFE sites inter-instrument calibration.
PRODUCER_FULL_NAME FRED A. KRUSE
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