Classification and change detection of salt cedar through CASI- 2 hyperspectral imagery in Lovelock, Nevada


Saltcedar (Tamarix) often forms monotypic stands and replaces cottonwoods, willows and other native riparian vegetation. Multitemporal Compact Airborne Spectrographic Imager (CASI-2) hyperspectral data were acquired on July 2, 2002, August 29, 2002, July 18, 2003 and September 10, 2003 at Lovelock Site, Nevada, USA. This paper mainly describes the methods used to map and detect the changes of salt cedar in Lovelock, Nevada from 2002 to 2003 for a large scale bio-control project. We compared band selection and feature extraction methods for classifying salt cedar at three different phases after releasing 1300 beetles in October 2001. The classification result indicated that the two methods are consistent. The PCA-based feature extraction methods also suggested a concise transform to detect the damage phases of salt cedars. The methods may be extended to other invasive species change detection applications using hyperspectral imagery.

Document Type

Conference Proceeding

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Journal Title

American Society for Photogrammetry and Remote Sensing - Annual Conference of the American Society for Photogrammetry and Remote Sensing 2006: Prospecting for Geospatial Information Integration