Land cover classification in multispectral imagery using clustering of sparse approximations over learned feature dictionaries

TitleLand cover classification in multispectral imagery using clustering of sparse approximations over learned feature dictionaries
Publication TypeJournal Article
Year of Publication2014
AuthorsMoody, Daniela I., Brumby Steven P., Rowland Joel C., and Altmann Garrett L.
JournalJournal of Applied Remote Sensing
Volume8
Issue1
Pagination084793
Date PublishedJan-01-2014
ISSN1931-3195
Abstract

We present results from an ongoing effort to extend neuromimetic machine vision algorithms to multispectral data using adaptive signal processing combined with compressive sensing and machine learning techniques. 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, and topographic/geomorphic characteristics. We use a 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 unsupervised clustering of sparse approximations (CoSA). We demonstrate our method on multispectral WorldView-2 data from a coastal plain ecosystem in Barrow, Alaska. We explore learning from both raw multispectral imagery and normalized band difference indices. 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. Our results suggest CoSA is a promising approach to unsupervised land cover classification in high-resolution satellite imagery.

URLhttp://remotesensing.spiedigitallibrary.org/article.aspx?doi=10.1117/1.JRS.8.084793
DOI10.1117/1.JRS.8.084793
Short TitleJ. Appl. Remote Sens