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Table 3

The accuracy of different methods for water body extraction in urban areas

Serial numberMethodKappa (%)Overall accuracy (%)Misclassification error (%)Omission error (%)
Single-band threshold method based on B4 band 94.06 99.89 6.51 5.23 
Single-band threshold method based on B6 band 93.21 99.87 8.99 4.32 
Water index method based on NDWI 65.66 99.14 48.29 8.54 
Unsupervised classification method based on ISODATA algorithm 84.24 99.66 26.25 1.36 
Unsupervised classification method based on K-means algorithm 76.79 99.46 37.1 0.56 
Supervised classification based on SVM 91.63 99.85 1.31 14.35 
Decision tree model method based on multi-band combined operation 94.41 99.90 4.42 6.6 
Serial numberMethodKappa (%)Overall accuracy (%)Misclassification error (%)Omission error (%)
Single-band threshold method based on B4 band 94.06 99.89 6.51 5.23 
Single-band threshold method based on B6 band 93.21 99.87 8.99 4.32 
Water index method based on NDWI 65.66 99.14 48.29 8.54 
Unsupervised classification method based on ISODATA algorithm 84.24 99.66 26.25 1.36 
Unsupervised classification method based on K-means algorithm 76.79 99.46 37.1 0.56 
Supervised classification based on SVM 91.63 99.85 1.31 14.35 
Decision tree model method based on multi-band combined operation 94.41 99.90 4.42 6.6 
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