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Field Spectrometers and Field Spectroscopy


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Field Spectrometers

We are currently using two ASD FR (0.4 - 2.5 micron) field spectrometers to measure samples and provide for in situ calibration of surface reflectance for terrestrial imaging spectroscopy studies. They also serve as laboratory spectrometers when rapid spectra are needed. In calibrating standards in the field, we usually obtain hundreds of spectra at a site and average them to provide an average spectrum similar to what the remote sensing instruments measure. We find that no field instrument can have the quality of a stable laboratory instrument because of temperature drifts and rapidly changing atmospheric absorptions. Thus we also obtain field samples which we measure on our laboratory instruments to confirm spectral details and to provide information for removing artifacts from the field data. This two step approach is our best assurance of precise spectra.

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U.S. Geological Survey, a bureau of the U.S. Department of the Interior
This page URL= http://speclab.cr.usgs.gov/field1.html
This site is maintained by: Dr. Roger N. Clark rclark@usgs.gov
Last modified January 17, 1999.