Walter Debruyn

TL;DR: This letter introduces a statistical procedure to provide band settings for a specific classification task and results on a vegetation classification task show an improvement in classification performance over feature selection and other band selection techniques.

TL;DR: This communication studies the detection of vegetation stress in hyperspectral data and uses the complete reflectance spectrum and its wavelet representation to detect fruit tree stress detection.

TL;DR: In this article, the possibilities of the combined use of airborne hyperspectral data and airborne laserscanning data to study sand dynamics on the Belgian backshore and foreshore were addressed.

TL;DR: APEX is a dispersive pushbroom imaging spectrometer operating in the spectral range between 380 - 2500 nm as discussed by the authors. But the spectral resolution will not be better than 10 nm in SWIR and < 5 nm in the VNIR range of the solar reflected range.

Abstract: Over the past few years, a joint Swiss/Belgium ESA initiative resulted in a project to build a precursor mission of future spaceborne imaging spectrometers, namely APEX (Airborne Prism Experiment). APEX is designed to be an airborne dispersive pushbroom imaging spectrometer operating in the solar reflected wavelength range between 4000 and 2500 nm. The system is optimized for land applications including limnology, snow, and soil, amongst others. The instrument is optimized with various steps taken to allow for absolute calibrated radiance measurements. This includes the use of a pre- and post-data acquisition internal calibration facility as well as a laboratory calibration and a performance model serving as a stable reference. The instrument is currently in its breadboarding phase, including some new results with respect to detector development and design optimization for imaging spectrometers. In the same APEX framework, a complete processing and archiving facility (PAF) is developed. The PAF not only includes imaging spectrometer data processing up to physical units, but also geometric and atmospheric correction for each scene, as well as calibration data input. The PAF software includes an Internet based web-server and provides interfaces to data users as well as instrument operators and programmers. The software design, the tools and its life cycle are discussed as well.