Human settlement expansion is one of the most pervasive forms of land cover change in the Gauteng province of South Africa. A method for detecting new settlement developments in areas that are typically covered by natural vegetation using 500 m MODIS time-series satellite data is proposed. The method is a per pixel change alarm that uses the temporal autocorrelation to infer a change index which yields a change or no-change decision after thresholding. Simulated change data was generated and used to determine a threshold during an off-line optimization phase. After optimization the method was evaluated on examples of known land cover change in the study area and experimental results indicate a 92% change detection accuracy with a 15% false alarm rate. The method shows good performance when compared to a traditional NDVI differencing method that achieved a 75% change detection accuracy with a 24% false alarm rate for the same study area.

Item Type:	Refereed Article
Keywords:	autocorrelation, change detection, MODIS, time-series
Research Division:	Engineering
Research Group:	Electrical and Electronic Engineering
Research Field:	Electrical and Electronic Engineering not elsewhere classified
Objective Division:	Expanding Knowledge
Objective Group:	Expanding Knowledge
Objective Field:	Expanding Knowledge in Engineering
Author:	Salmon, BP (Dr Brian Salmon)
Author:	Olivier, JC (Professor JC Olivier)
ID Code:	79451
Year Published:	2012
Web of Science® Times Cited:	12
Deposited By:	Engineering
Deposited On:	2012-09-12
Last Modified:	2017-11-06
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