Data Set Information
DATA_SET_NAME C130 EARTH TIMS EDITED EXPERIMENT DATA RECORD IMAGE V1.0
DATA_SET_ID C130-E-TIMS-2-EDR-IMAGE-V1.0
NSSDC_DATA_SET_ID
DATA_SET_TERSE_DESCRIPTION
DATA_SET_DESCRIPTION Data Set Overview : Thermal Infrared Multispectral Scanner (TIMS) data were collected over geologic features such as volcanic fields, playas, dunes, and alluvial fans. Each image file contains 6 bands in band-interleaved format, 8 bits per pixel. Each image is accompanied by an auxiliary file which contains the line by line temperature values of the references sources as recorded by the thermistors during each data take as well as the corresponding radiance values (in all six bands) for each thermistor as recorded by the scan head. During the July, 1989, TIMS flights, the reference sources did not maintain a constant temperature. Instead, the temperature of the sources appeared to vary periodically (3 degrees on average) about a mean temperature (usually the initial preset temperature) as tracked by the thermistors. This temperature periodicity was not tracked accurately by the scanner - it was more rapid than the scanning period. Thus, the scanner sampled different pieces of the temperature wave during the time of data collection. In addition to this problem, the temperature variation was often insufficient to trigger the scanner to record a higher DN value, so two or more temperatures (as recorded by the thermistors) are often represented by a single DN value. In other words, at no time was the true temperature or the corresponding DN value known precisely. As a result of these calibration problems, the TIMS data are presented in values of DN only. Processing Level Id : 2 Software Flag : N Processing Start Time : 1989-07-18T00:00:00.000 Processing Stop Time : 1991-05-28T00:00:00.000 Parameters : Data Set Parameter 'RADIANCE' ----------------------------- Radiance is the amount of energy per time per projected area per steradian. Data Set Parameter Name : RADIANCE Data Set Parameter Unit : WATT/(METER*METER)/STERADIAN Sampling Parameter Name : PIXEL Sampling Parameter Unit : METER Minimum Sampling Parameter : N/A Maximum Sampling Parameter : N/A Sampling Parameter Resolution : 56.57 Sampling Parameter Interval : 20 Minimum Available Sampling Int : N/A Noise Level : UNK Source Instrument Parameters : Instrument Host ID : C130 Data Set Parameter Name : RADIANCE Instrument Parameter Name : RADIANCE Important Instrument Parameters : 1 Measurement Information : Atmospheric Conditions ---------------------- Not Applicable Source ------ Detects thermal energy emitted from the Earth's surface and atmosphere. Calibration Standard -------------------- Not Applicable Wavelength Calibration ---------------------- Not Applicable Processing : Processing History ------------------ Source Data Set ID : N/A Software : UNK Product Data Set ID : C130-E-TIMS-2-EDR-IMAGE-V1.0
DATA_SET_RELEASE_DATE 1991-05-28T00:00:00.000Z
START_TIME 1989-07-17T10:11:27.000Z
STOP_TIME 1989-09-29T11:26:41.000Z
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 C130
INSTRUMENT_NAME THERMAL INFRARED MULTISPECTRAL SCANNER
INSTRUMENT_ID TIMS
INSTRUMENT_TYPE THERMAL INFRARED SPECTROMETER
NODE_NAME Geosciences
ARCHIVE_STATUS ARCHIVED
CONFIDENCE_LEVEL_NOTE Overview : The accuracy of brightness temperatures or emissivities calculated from TIMS data depends on the accuracy with which the brightness temperature of the reference sources can be established. To determine this relationship, laboratory measurements involving two different external blackbodies have been made. The first set of measurements indicated that the brightness temperature of the internal reference sources agreed with the external blackbody to within +/- 1.8 degrees C at all internal reference source temperatures checked (24 to 51 degrees C). The second set of measurements covering a wider range (10 to 55 degrees C) have not yet been fully reduced; however, preliminary results do not appear to agree with the first set. It may be that encoded radiance values vary somewhat with the temperature of the TIMS itself. During data acquisition, the TIMS instrument is exposed to the atmosphere. A direct consequence of this experimental set-up is an overestimation of the blackbody temperatures, due to the presence of condensation on the blackbodies and additional radiant cooling of the blackbody surfaces. This results in an underestimation of the radiance of the blackbodies and of the ground surface being imaged. The absolute effects of this problem are being presently studied by researchers at the Jet Propulsion Laboratory.
CITATION_DESCRIPTION Arvidson, R. E., C130 EARTH TIMS EDITED EXPERIMENT DATA RECORD IMAGE V1.0, C130-E-TIMS-2-EDR-IMAGE-V1.0, NASA Planetary Data System, 1991
ABSTRACT_TEXT Thermal Infrared Multispectral Scanner (TIMS) data were collected over geologic features such as volcanic fields, playas, dunes, and alluvial fans. Each image file contains 6 bands in band-interleaved format, 8 bits per pixel. Each image is accompanied by an auxiliary file which contains the line by line temperature values of the references sources as recorded by the thermistors during each data take as well as the corresponding radiance values (in all six bands) for each thermistor as recorded by the scan head.
PRODUCER_FULL_NAME RAYMOND E. ARVIDSON
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