Spectral angle mapper and object-based classification combined with hyperspectral remote sensing imagery for obtaining land use/cover mapping in a Mediterranean region

Abstract

In this study, we test the potential of two different classification algorithms, namely the spectral angle mapper (SAM) and object-based classifier for mapping the land use/cover characteristics using a Hyperion imagery. We chose a study region that represents a typical Mediterranean setting in terms of landscape structure, composition and heterogeneous land cover classes. Accuracy assessment of the land cover classes was performed based on the error matrix statistics. Validation points were derived from visual interpretation of multispectral high resolution QuickBird-2 satellite imagery. Results from both the classifiers yielded more than 70% classification accuracy. However, the object-based classification clearly outperformed the SAM by 7.91% overall accuracy (OA) and a relatively high kappa coefficient. Similar results were observed in the classification of the individual classes. Our results highlight the potential of hyperspectral remote sensing data as well as object-based classification approach for mapping heterogeneous land use/cover in a typical Mediterranean setting.

Keywords:

• Hyperion
• spectral angle mapper
• object-based classification
• hyperspectral
• land cover/use mapping

Acknowledgements

The authors wish to thank the United States Geological Survey (USGS) and Google Earth for the datasets. The authors express their gratitude to the anonymous reviewers for their constructive comments and suggestions. Dr. Petropoulos thanks INFOCOSMOS E.E. (http://www.infocosmos.eu) for organizational support during his participation in this work.