U.S. Geological Survey home page


Clark et. al. 2003 USGS Open File Report 03-395
Spectral Library splib05a Sample Description

(For further information on spectrsocopy, see: http://speclab.cr.usgs.gov)

TITLE: LeafySpurge Spurge-B2-Jul98 DESCRIPT

DOCUMENTATION_FORMAT: Plant

SAMPLE_ID: Spurge-B2-Jul98

PLANT_TYPE: Invasive herbaceous perennial weed

PLANT: Leafy spurge

LATIN_NAME: Euphorbia esula L.

COLLECTION_LOCALITY: Golden, Colorado

ORIGINAL_DONOR:

SAMPLE_DESCRIPTION:

Average reflectance for the yellow-green flower bracts of the invasive plant species leafy spurge (Euphorbia esula L.). The leafy spurge plants in the general area had green leaves. Only a few plants had retained their yellow-green flower bracts. The surrounding grass cover was dry, brown, and sensescent.

The spectra were collected with the head of the spectrometer pointed slightly off-nadir, approximately 3 centimeters from the bract surface. This average spectrum was computed from 10 individual recorded spectra (each recorded spectrum was an average of 30 measurements).

The spectra were measured on July 10, 1998.

This area of leafy spurge is situated on a southwest facing slope in an area that had been grazed by cattle. The general location is a rural area on the northern edge of the city of Golden, Colorado (GPS coordinates are 39 degrees 47.062 minutes N latitude, 105 degrees 14.425 minutes W longitude; Datum = WGS84).

The specific location (Site B) of the area from which the leaves of the leafy spurge plant was measured is 60 meters SE of the given GPS coordinates.

Sky conditions during the measurement were mostly clear with a few small, patchy clouds.

Related spectra were taken in this same area (Spurge-B1-Jul98 and Spurge-B3-Jul98).

Photos of the sample:

Not Available

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

LIB_SPECTRA_HED: where Wave Range Av_Rs_Pwr Comment
LIB_SPECTRA: splib05a r 11371 0.2-3.0µm 200


USA.gov logo  Take Pride in America button