Field Spectrometers and Field Spectroscopy
http://speclab.cr.usgs.gov
(Use of trade names are for descriptive purposes only and does not constitute
endoresment by the USGS or spectroscopy lab personnel.)
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.
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.
