ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci., III-7, 33-40, 2016
http://www.isprs-ann-photogramm-remote-sens-spatial-inf-sci.net/III-7/33/2016/
doi:10.5194/isprs-annals-III-7-33-2016
 
07 Jun 2016
SPECTRAL BAND SELECTION FOR URBAN MATERIAL CLASSIFICATION USING HYPERSPECTRAL LIBRARIES
A. Le Bris1, N. Chehata2,3, X. Briottet4, and N. Paparoditis1 1Université Paris-Est, IGN/SR, MATIS, 73 avenue de Paris, 94160 Saint Mandé , France
2IRD/UMR LISAH El Menzah 4, Tunis, Tunisia
3Bordeaux INP, G&E, EA 4592, 33600, Pessac, France
4ONERA, The French Aerospace Lab, 2 avenue Edouard Belin, BP 74025, 31055 Toulouse CEDEX 4, France
Abstract. In urban areas, information concerning very high resolution land cover and especially material maps are necessary for several city modelling or monitoring applications. That is to say, knowledge concerning the roofing materials or the different kinds of ground areas is required. Airborne remote sensing techniques appear to be convenient for providing such information at a large scale. However, results obtained using most traditional processing methods based on usual red-green-blue-near infrared multispectral images remain limited for such applications. A possible way to improve classification results is to enhance the imagery spectral resolution using superspectral or hyperspectral sensors. In this study, it is intended to design a superspectral sensor dedicated to urban materials classification and this work particularly focused on the selection of the optimal spectral band subsets for such sensor. First, reflectance spectral signatures of urban materials were collected from 7 spectral libraires. Then, spectral optimization was performed using this data set. The band selection workflow included two steps, optimising first the number of spectral bands using an incremental method and then examining several possible optimised band subsets using a stochastic algorithm. The same wrapper relevance criterion relying on a confidence measure of Random Forests classifier was used at both steps. To cope with the limited number of available spectra for several classes, additional synthetic spectra were generated from the collection of reference spectra: intra-class variability was simulated by multiplying reference spectra by a random coefficient. At the end, selected band subsets were evaluated considering the classification quality reached using a rbf svm classifier. It was confirmed that a limited band subset was sufficient to classify common urban materials. The important contribution of bands from the Short Wave Infra-Red (SWIR) spectral domain (1000–2400 nm) to material classification was also shown.
Conference paper (PDF, 958 KB)


Citation: Le Bris, A., Chehata, N., Briottet, X., and Paparoditis, N.: SPECTRAL BAND SELECTION FOR URBAN MATERIAL CLASSIFICATION USING HYPERSPECTRAL LIBRARIES, ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci., III-7, 33-40, doi:10.5194/isprs-annals-III-7-33-2016, 2016.

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