Spectron SE590 Radiometer OTTER Data Description Date: March 3, 1992 Instrument Description: The Spectron instrument is a portable, battery-powered spectroradiometer, weighing about 1 kg, with interchangeable detector heads. The three measurement heads have the following spectral ranges: 350-1100 nm, 400-800 nm, and a shortwave infrared (SWIR) head with a 1100-2500 nm range. Each of the detector heads uses a diffraction grating to disperse the incoming light onto a linear photodiode array. The signal is conducted to the controller electronics via a cable. The controller is microprocessor based and processes the signal from the detector head. Integration times are from 1/60 sec to 1.0 sec. The integration time can be automatically selected by the instrument or manually chosen by input from a key pad. The SWIR head always collects data with a 1.0 sec integration time. The SE590 can use an AC/DC converter instead of battery power. The instrument stores data in 16-bit words. The visable-to-near infrared heads record data in 256 channels and the SWIR head in 66 channels. Scans can be internally averaged. Data can be output to a laptop computer through an RS 232 port, an oscilloscope, or to a built-in tape recorder. Data processing by the laptop computer results in an output file normalized to counts/sec. OTTER Use of Spectron Radiometers: This instrument has been used to take spectra of foliage, ground, and asphalt samples in the field and dried plant specimens in the laboratory. See the description of data collection by each investigator in the database. OTTER Data Acquisition: Sites where Spectron data have been gathered are shown below broken down according to OTTER investigator. Consult the database for specific dates of acquisition and for the materials for which spectra were taken. ------------------------------------------------------------------------------ Freemantle Goward ISTS* Johnson Strahler Site** C. H. X X X X W. W. X X Scio X X X X X S. P. X X X X X Met. X X X X X Jun. X X X X X ------------------------------------------------------------------------------ * personnel from the Institute for Space and Terrestrial Science gathered these data **Site Abbreviations: C. H. = Cascade Head; W. W. = Warings Woods; S. P. = Santiam Pass; Met. = Metolius; Jun. = Juniper Data Decommutation: (See listing of OTTER contacts below) OTTER contacts (these are scientists who have contributed Spectron data to the database): James. R. Freemantle Earth Observations Laboratory Institute for Space and Terrestrial Science 4850 Keele Street, North York, Ontario CANADA, M3J 3K1 Tel: 416/665-5405, Dr. Sam Goward Dept. of Geography University of Maryland College Park, MD 20742 Tel: 301/405-4055 Lee F. Johnson TGS Technology, Inc. MS 242-4, Ames Research Center Moffett Field, Calif. 94035 Tel: 415/604-3331 Dr. John. R. Miller Earth Observations Laboratory Institute for Space and Terrestrial Science 4850 Keele Street North York, Ontario CANADA, M3J 3K1 Tel: 416/736-2100, ext. 77729 Dr. Alan Strahler Department of Geography Boston University Boston, Massachusetts 02215 Tel: 617/353-5984 References: Hall, F. , D. Strebel, J. Nickeson, and S Goetz. 1991. Radiometric rectification: Towards a common radiometric response among multidata, multi-sensor images. Remote Sensing of Environment 35:11-27. Miller J, C. Elvidge, B. Rock, and J. Freemantle. 1990. An airborne perspective on vegetation phenology from the analysis of AVIRIS data sets over the Jasper Ridge Biological Preserve. Proceedings IGARSS'90 Washington, D. C., pp 565-568, May 20-24. Reflectance Calibration Standards, Labsphere, Inc. P.O. Box 70, North Sutton, NH, USA 03260. Schott, J. , C. Salvaggio, and W. Volchok. 1988. Radiometric scene normalization using pseudoinvariant features. Remote Sensing of Environment 26:1-16. SE590 Field-Portable Data-logging Spectroradiometer Operating Manual, Spectron Engineering, Inc. 225 Yuma Court, Denver CO 80223 USA. author and date of extract: Jay Skiles, March 3, 1992