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Journal of Applied Remote Sensing

Hyperspectral image classification for mapping agricultural tillage practices
Author(s): Qiong Ran; Wei Li; Qian Du; Chenghai Yang
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Paper Abstract

An efficient classification framework for mapping agricultural tillage practice using hyperspectral remote sensing imagery is proposed, which has the potential to be implemented practically to provide rapid, accurate, and objective surveying data for precision agricultural management and appraisal from large-scale remote sensing images. It includes a local region filter [i.e., Gaussian low-pass filter (GLF)] to extract spatial-spectral features, a dimensionality reduction process [i.e., local fisher’s discriminate analysis (LFDA)], and the traditional k-nearest neighbor (KNN) classifier, and is denoted as GLF-LFDA-KNN. Compared to our previously used local average filter and adaptive weighted filter, the GLF also considers spatial features in a small neighborhood, but it emphasizes the central pixel itself and is data-independent; therefore, it can achieve the balance between classification accuracy and computational complexity. The KNN classifier has a lower computational complexity compared to the traditional support vector machine (SVM). After classification separability is enhanced by the GLF and LFDA, the less powerful KNN can outperform SVM and the overall computational cost remains lower. The proposed framework can also outperform the SVM with composite kernel (SVM-CK) that uses spatial-spectral features.

Paper Details

Date Published: 6 March 2015
PDF: 12 pages
J. Appl. Remote Sens. 9(1) 097298 doi: 10.1117/1.JRS.9.097298
Published in: Journal of Applied Remote Sensing Volume 9, Issue 1
Show Author Affiliations
Qiong Ran, Beijing Univ. of Chemical Technology (China)
Wei Li, Beijing Univ. of Chemical Technology (China)
Qian Du, Mississippi State Univ. (United States)
Chenghai Yang, Agricultural Research Service (United States)

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