Tian, Jiaojiao3; Nielsen, Allan Aasbjerg1; Reinartz, Peter3
1 Department of Applied Mathematics and Computer Science, Technical University of Denmark2 Image Analysis & Computer Graphics, Department of Applied Mathematics and Computer Science, Technical University of Denmark3 German Aerospace Center
The goal of this paper is to develop an efficient method for forest change detection using multitemporal stereo panchromatic imagery. Due to the lack of spectral information, it is difficult to extract reliable features for forest change monitoring. Moreover, the forest changes often occur together with other unrelated phenomena, e.g., seasonal changes of land covers such as grass and crops. Therefore, we propose an approach that exploits kernel Minimum Noise Fraction (kMNF) to transform simple change features into high-dimensional feature space. Digital surface models (DSMs) generated from stereo imagery are used to provide information on height difference, which is additionally used to separate forest changes from other land-cover changes. With very few training samples, a change mask is generated with iterated canonical discriminant analysis (ICDA). Two examples are presented to illustrate the approach and demonstrate its efficiency. It is shown that with the same amount of training samples, the proposed method can obtain more accurate change masks compared with algorithms based on k-means, one-class support vector machine, and random forests.
Ieee Transactions on Geoscience and Remote Sensing, 2014, Vol 52, Issue 11, p. 7130-7139
Geoscience; Signal Processing and Analysis; Accuracy; Change detection; Digital surface model (DSM); Feature extraction; Forest; Kernel; Kernel Minimum Noise Fraction (kMNF); Noise; Noise measurement; Optical stereo data; Support vector machines; Training