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DOCUMENTATION_FORMAT: PLANT
SAMPLE_ID: DWO-3-DEL-2 Phragmites australis stems
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: 29.09709 deg. N
COLLECTION_LONGITUDE: 89.07351 deg. W
DATUM: NAD83
ORIGINAL_DONOR: Raymond F. Kokaly, USGS
SAMPLE_DESCRIPTION:
This spectrum is the average reflectance of 10 field measurements (using an artificial light source) of brown stems of Phragmites australis. The stems were found littering beach sand between green stands of the plant. Some of the stems showed signs of degradation, appearing gray in color with frayed ends. The reflectance measurements were made on August 14, 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 stems. After each recording, the contact probe was moved to a different stack of stems. 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 50 channels(0.35 - 0.40 microns) in the spectral measurement show relatively high levels of noise.
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 was used in the following publication:
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