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Soft classification based Sub-pixel allocation model

Kumar, Uttam and Mukhopadhyay, C and Raja, Kumar S and Ramachandra, TV (2008) Soft classification based Sub-pixel allocation model. In: In Proceedings of the International Conference on Operations Research for a growing nation in conjunction with the 41st Annual Convention of Operational Research Society of India, Tirupati, AP, India, Tirupati, AP.

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Land cover (LC) refers to what is actually present on the ground and provide insights into the underlying solution for improving the conditions of many issues, from water pollution to sustainable economic development. One of the greatest challenges of modeling LC changes using remotely sensed (RS) data is of scale-resolution mismatch: that the spatial resolution of detail is less than what is required, and that this sub-pixel level heterogeneity is important but not readily knowable. However, many pixels consist of a mixture of multiple classes. The solution to mixed pixel problem typically centers on soft classification techniques that are used to estimate the proportion of a certain class within each pixel. However, the spatial distribution of these class components within the pixel remains unknown. This study investigates Orthogonal Subspace Projection - an unmixing technique and uses pixel-swapping algorithm for predicting the spatial distribution of LC at sub-pixel resolution. Both the algorithms are applied on many simulated and actual satellite images for validation. The accuracy on the simulated images is ~100%, while IRS LISS-III and MODIS data show accuracy of 76.6% and 73.02% respectively. This demonstrates the relevance of these techniques for applications such as urban-nonurban, forest-nonforest classification studies etc.

Item Type: Conference Paper
Keywords: Soft classification;sub-pixel;orthogonal subspace projection;pixel-swapping;resolution
Department/Centre: Division of Interdisciplinary Sciences > Management Studies
Date Deposited: 27 Sep 2011 08:55
Last Modified: 27 Sep 2011 08:55
URI: http://eprints.iisc.ac.in/id/eprint/40921

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