Creating and sharing knowledge for telecommunications

Parallel Sparse Unmixing of Hyperspectral Data

Alves, J.M.R.A ; Nascimento, J. ; Bioucas-Dias, J. ; Plaza, A. ; Silva, V.

Parallel Sparse Unmixing of Hyperspectral Data, Proc IEEE International Geoscience and Remote Sensing Symp.- IGARSS, Melbourne, Australia, Vol. -, pp. 1446 - 1449, July, 2013.

Digital Object Identifier: 10.1109/IGARSS.2013.6723057

unmixing of remotely sensed hyperspectral data on commodity
graphics processing units (GPUs) is presented.
A semi-supervised approach is adopted, which relies on the increasing availability of spectral libraries of materials measured on the ground instead of resorting to endmember extraction methods. This method is based on the spectral unmixing by splitting and augmented Lagrangian (SUNSAL) that estimates the material’s abundance fractions. The parallel method is performed in a pixel-by-pixel fashion and its implementation properly exploits the GPU architecture at low level, thus taking full advantage of the computational power of GPUs. Experimental results obtained for simulated and real hyperspectral datasets reveal significant speedup factors, up to 164 times, with regards to optimized serial implementation.