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DOCUMENTATION_FORMAT: PLANT
SAMPLE_ID: CRMS-0153 brown leaves of Phragmites australis
PLANT_TYPE: Wetland grass (reed), perennial, growth habit from grass to shrub
PLANT: Roseau cane, also known as common reed
LATIN_NAME: Phragmites australis (Cav.) Trin. ex Steud.
COLLECTION_LOCALITY: Bird's Foot delta of the Mississippi river, Louisiana
COLLECTION_LATITUDE: 29.114132 deg. N
COLLECTION_LONGITUDE: 89.134354 deg. W
DATUM: NAD83
ORIGINAL_DONOR: Raymond F. Kokaly, USGS
SAMPLE_DESCRIPTION:
This spectrum is the average reflectance of 18 field measurements (using an artificial light source) of brown, non-photosynthetic leaves of Phragmites australis. The brown leaves were found on the lower portions of stems of the plant. The reflectance measurements were made on July 8, 2010, using an ASD Field Spectrometer 3 (FS3) in reflectance mode, relative to a Spectralon reference panel. The contact probe attachement (an artificial light source with a restricted, 1 cm diameter, field of view) was used to measure the reflectance spectra of stacks of leaves. After each recording, the contact probe was moved to a different stack of leaves. An average spectrum was computed from the recorded measurements. The average spectrum was converted to absolute reflectance by multiplying by the reflectance spectrum of the Spectralon reference panel. The first detector in the spectometer, covering the wavelength range 0.35 - 1.00 microns, was saturated during the measurement; therefore, these channels have been set to the deleted point value of the SPECPR format (1.23e+34).
Site Classification
The area has been predominantly classified as intermediate marsh (see http://lacoast.gov/crms2/home.aspx).
General Site Description
The plot is located in southern Louisiana, approximately 136 kilometers southeast of New Orleans, Louisiana.
It is in the Mississippi River Delta hydrologic basin on the coast of the Gulf of Mexico.
For additional information on the CRMS site see http://lacoast.gov/crms2/home.aspx
Project Background
This site was measured as part of joint work between the USGS Denver Spectroscopy Laboratory and the
Coastal Restoration Assessment Branch of the USGS National Wetlands Research Center, Baton Rouge.
This spectrum, labeled as "Veg-DryPhragmites", was published and described in:
Kokaly, R.F., Couvillion, B.R., Holloway, J.M., Roberts, D.A., Ustin, S.L., Peterson, S.H., Khanna, S., and Piazza, S.C., 2013,
Spectroscopic remote sensing of the distribution and persistence of oil from the Deepwater Horizon spill in Barataria Bay marshes,
Remote Sensing of Environment, Volume 129, Pages 210-230. http://dx.doi.org/10.1016/j.rse.2012.10.028
IMAGE_OF_SAMPLE:
END_SAMPLE_DESCRIPTION.
COMPOSITIONAL_ANALYSIS_TYPE: None
COMPOSITION_DISCUSSION:
END_COMPOSITION_DISCUSSION.
TRACE_ELEMENT_ANALYSIS:
TRACE_ELEMENT_DISCUSSION:
END_TRACE_ELEMENT_DISCUSSION.
SPECTROSCOPIC_DISCUSSION:
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1a2_3_4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns