Iranian Journal of Remote Sensing and GIS

Iranian Journal of Remote Sensing and GIS

Evaluating and Improving the Functionality of Simulated Annealing Algorithm for Sub-pixel Land Cover Mapping Using Multispectral Imagery

Document Type : علمی - پژوهشی

Authors
Jadidi Milad Niroumand 1
Mehdi Mokhtarzade 2
Mahmood Reza Sahebi 3
1 MSc Student, Department of Remote Sensing Engineering, K. N. Toosi University of Technology
2 Associated Professor, Department of Remote Sensing Engineering, K. N. Toosi University of Technology
3 Assistant Professor, Department of Remote Sensing Engineering, K. N. Toosi University of Technology
Abstract
The mixed pixels are considered as a major challenge in land cover mapping procedure from satellite imagery. Developments of the spectral unmixing and soft classification methods have provided the possibility for estimation of class proportions within the pixels. However, sub-pixel land cover mapping requires the spatial allocation of the sub-pixels. Recently, the Super Resolution Mapping (SRM) techniques have been developed for optimization of the sub-pixels spatial arrangement using the outputs of soft classifiers and based on the concepts of spatial dependency. In this research, the overall capability of the simulated annealing algorithm was evaluated through sub-pixel land cover mapping of the study area. To do so, a novel method was proposed for generating new solutions in each step of the algorithm and then the results were compared to the traditional method. On the other hand, the effective parameters on the performance of the algorithm (e.g. zoom factor, cooling function type, static and dynamic iterations) were investigated. According to the obtained results, higher values of zoom factor yields more promising overall accuracy . Also, the geometric function was found as the optimal cooling function with respect to the overall accuracy and processing speed. Meanwhile, dynamic iterations demonstrated more accuracy than the static case. As another key result of the paper, the proposed method for generating the new solutions in simulated annealing algorithm is led to increasing of the overall accuracy and also reducing the processing time of algorithm up to 50 percent. The most accurate result of the proposed algorithm, which was obtained for the that case of being independent from soft classifier, is determined 94.97 percent
Keywords
Land cover
Sub-pixel
Soft Classification
Simulated Annealing
Cooling Function
Zoom Facto
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