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DOCUMENTATION_FORMAT: PLANT
SAMPLE_ID: water near CRMS322v84
PLANT_TYPE: none, marsh water background
PLANT: none, marsh water background
LATIN_NAME: none, marsh water background
COLLECTION_LOCALITY: Coastwide Reference Monitoring System (CRMS) site 322 subplot v84. CRMS322 is located in southern Louisiana, approximately 127 kilometers southwest of New Orleans, Louisiana, in the western part of the Terrebonne hydrologic basin on the coast of the Gulf of Mexico.
COLLECTION_LATITUDE: 29.243933 deg. N
COLLECTION_LONGITUDE: 91.105775 deg. W
DATUM: NAD83
ORIGINAL_DONOR: Raymond F. Kokaly, USGS
SAMPLE_DESCRIPTION:
This spectrum is the average reflectance of 6 field measurements of shallow water at the marsh edge. The water's surface had a murky brown color.
The measurements were made on June 7, 2010.
These spectra were made using an ASD Field Spectrometer 3 (FS3) in reflectance mode, relative to a Spectralon reference panel.
The fiber optic was held at shoulder height while standing at the marsh edge and pointed to minimize the amount of sun-glint.
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 following channels were deleted from the spectrum (set to a value of -1.23e+34) because of atmospheric contamination or high levels of noise:
410-420, 768-796, 1002-1100, 1447-1622, 1651-1669, and 2077-2151 corresponding to wavelengths
0.759-0.769, 1.117-1.145, 1.351-1.449, 1.796-1.971, 2.000-2.018, and 2.426-2.500
Site Classification
The area has been predominantly classified as saline marsh (see http://lacoast.gov/crms2/home.aspx).
General Site Description
The plot is located in southern Louisiana, approximately 127 kilometers southwest of New Orleans, Louisiana.
It is in the western part of the Terrebonne 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 was used 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: open water in the photo; in the site layout diagram, the subplot location is indicated by the matching number within the parentheses
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