Publication Abstract
Determining the Effects of Storage on Cotton and Soybean Leaf Samples for Hyperspectral Analysis
Lee, M., Huang, Y., Yao, H., Thomson, S. J., & Bruce, L. (2014). Determining the Effects of Storage on Cotton and Soybean Leaf Samples for Hyperspectral Analysis. 2014 IEEE. EEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing. 7(6). DOI:10.1109/JSTARS.2014.2330521.
Abstract
Abstract—This paper studies the effect of storage techniques for
transporting collected plant leaves from the field to the laboratory
for hyperspectral analysis. The strategy of collecting leaf samples in
the field for laboratory analysis is typically used when ground
truthing is needed in remote sensing studies. Results indicate that
the accuracy of hyperspectral measurements depends on a combination
of storage technique (in a cooler or outside a cooler), time
elapsed between collecting leaf samples in the field and measuring in
the laboratory, and the plant species. A nonlinear model fitting
method is proposed to estimate the spectrum of decaying plant
leaves. This revealed that the reflectance of soybean leaves remained
within the normal range for 45 min when the leaves were stored in a
cooler, while soybean leaves stored outside a cooler remained within
the normal range for 30 min. However, cotton leaves stored in a
cooler decayed faster initially. Regardless of storage technique,
results indicate that up to a maximum of 30 min can elapse between
plant leaf sampling in the field and hyperspectral measurements in
the laboratory. This study focused on cotton and soybean leaves, but
the implication that time elapsing between sampling leaves and
measuring their spectrum should be limited as much as possible can
be applied to any study on other crop leaves. Results of the study also
provide a guideline for crop storage limits when analyzing by
laboratory hyperspectral sensing setting to improve the quality
and reliability of data for precision agriculture.
Index Terms—Ground truthing, hyperspectral imaging, leaf
sampling, remote sensing, spectral decay.