 This study compared three different methods for mapping mangroves in the Brisbane River area, southeast Queensland, Australia. The first method, spectral angle mapper, SAM, produced accurate class polygons with only a few unclassified pixels, overall accuracy of 69%. The second method, linear spectral unmixing, LSU, produced a patchy polygon pattern with many unclassified pixels, overall accuracy of 56%. Finally, the third method, object-based image analysis, OBIA, produced the most accurate results, overall accuracy of 76%. The OBIA method combined a rule-based and nearest neighbor classification method, resulting in the most accurate results. This article was authored by Mohammed Kamal and Stuart Finn.