Table 1 Summary of maximum likelihood results for classifications with a null class (A) and without a null class (B).

From: Delineating Areas of Past Environmental Degradation near Smelters using Rock Coatings: A Case Study at Rouyn-Noranda, Quebec

coated rock correctly classified

coated rock misclassified as uncoated rock

coated rock misclassified as uncoated urban

coated rock assigned to null class

(A) With Null Class

78.3%

6.7%

4.4%

10.5%

(B) Without Null Class

90.5%

7.2%

2.2%

n/a

  1. Classes mislabelled as coated bedrock for the classification with a null class: none. Classes mislabelled as coated bedrock for the classification without a null class: uncoated bedrock (4.9%), shallower water (0.4%), uncoated urban 0.2%). Though the classification without a null class has a higher proportion of coated bedrock test pixels that were correctly classified as such, it is also characterized by problematic false positives involving other classes, most notably the uncoated bedrock class.
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