Table 2.

Random Forest model classification results for the model training study site in Algeria and when applied to the additional study site scene in Niger. Omission errors for model detection of oil exploration and extraction sites from field-derived locations. Additional ‘novel’ model-detected sites in Niger that were not known from original field-derived location data are also listed; these were visually validated using an RGB visualization (7, 4 and 2 bands) of the original Landsat 7 ETM+ scene.

area	field-detected sites	model-detected sites	omission error (%)	novel sites
Algeria	1 (2)a	3	0	0
Niger	7	4	43	3

^aAdditional sites in brackets determined via high-resolution Google Earth imagery.