22 May 2014 Land cover classification in multispectral satellite imagery using sparse approximations on learned dictionaries
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Techniques for automated feature extraction, including neuroscience-inspired machine vision, are of great interest for landscape characterization and change detection in support of global climate change science and modeling. We present results from an ongoing effort to extend machine vision methodologies to the environmental sciences, using state-of-theart adaptive signal processing, combined with compressive sensing and machine learning techniques. We use a modified Hebbian learning rule to build spectral-textural dictionaries that are tailored for classification. We learn our dictionaries from millions of overlapping multispectral image patches and then use a pursuit search to generate classification features. Land cover labels are automatically generated using CoSA: unsupervised Clustering of Sparse Approximations. We demonstrate our method on multispectral WorldView-2 data from a coastal plain ecosystem in Barrow, Alaska (USA). Our goal is to develop a robust classification methodology that will allow for automated discretization of the landscape into distinct units based on attributes such as vegetation, surface hydrological properties (e.g., soil moisture and inundation), and topographic/geomorphic characteristics. In this paper, we explore learning from both raw multispectral imagery, as well as normalized band difference indexes. We explore a quantitative metric to evaluate the spectral properties of the clusters, in order to potentially aid in assigning land cover categories to the cluster labels.
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Daniela I. Moody, Daniela I. Moody, Steven P. Brumby, Steven P. Brumby, Joel C. Rowland, Joel C. Rowland, Garrett L. Altmann, Garrett L. Altmann, } "Land cover classification in multispectral satellite imagery using sparse approximations on learned dictionaries", Proc. SPIE 9124, Satellite Data Compression, Communications, and Processing X, 91240Y (22 May 2014); doi: 10.1117/12.2049843; https://doi.org/10.1117/12.2049843

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