SPATIO-TEMPORAL ANOMALY DETECTION FOR ENVIRONMENTAL IMPACT ASSESSMENT: A CASE OF AN ABANDONED COAL MINE SITE IN TURKEY


Soydan H. , Koz A., Duzgun H. S.

Conference on Remote Sensing and Modeling of Ecosystems for Sustainability XIV, California, Amerika Birleşik Devletleri, 09 Ağustos 2017, cilt.10405 identifier identifier

  • Cilt numarası: 10405
  • Doi Numarası: 10.1117/12.2276080
  • Basıldığı Şehir: California
  • Basıldığı Ülke: Amerika Birleşik Devletleri

Özet

The main purpose of this research is to determine the anomalies regarding the coal mining operations in an abandoned coal mine site in central Anatolia by multi-temporal image analysis of Landsat 4-5 surface reflectance data. A wellknown anomaly detection algorithm, Reed-Xioli (RX), which calculates square of Mahalanobis metrics to calculate the likelihood ratios by normalizing the difference between the test pixel and the background to allocate anomaly pixels, is implemented across the time series. The experimental results reveal especially the profound land use -land cover change in time series, pointing out critically abandoned regions that need immediate rehabilitation action. The rate of anomaly scores together with their relation to mine development over the focused time spectrum discloses a linearity trend as of the operations are ceased at the end of 1990s, which is indicative of the capacity of the applied method. The performance of the algorithm is also quantified with Receiver Operating Characteristics (ROC) curves and precision-recall graphs to reveal its capability on Landsat Thematic Mapper (TM) multispectral image series. The resulting plots show the increasing capability of the hyperspectral anomaly detection technique in multi-temporal data set, with a steady and slight increase in performance between 2000 and 2012 after the end of the mining activities, which substantiates the success of global RX algorithm to identify the mining-induced land use and land cover anomalies.