{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,17]],"date-time":"2026-04-17T09:12:52Z","timestamp":1776417172822,"version":"3.51.2"},"reference-count":78,"publisher":"MDPI AG","issue":"11","license":[{"start":{"date-parts":[[2018,11,9]],"date-time":"2018-11-09T00:00:00Z","timestamp":1541721600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>This study was an evaluation of the spectral signature generalization properties of coral across four remote Pacific Ocean reefs. The sites under consideration have not been the subject of previous studies for coral classification using remote sensing data. Previous research regarding using remote sensing to identify reefs has been limited to in-situ assessment, with some researchers also performing temporal analysis of a selected area of interest. This study expanded the previous in-situ analyses by evaluating the ability of a basic predictor, Linear Discriminant Analysis (LDA), trained on Depth Invariant Indices calculated from the spectral signature of coral in one location to generalize to other locations, both within the same scene and in other scenes. Three Landsat 8 scenes were selected and masked for null, land, and obstructed pixels, and corrections for sun glint and atmospheric interference were applied. Depth Invariant Indices (DII) were then calculated according to the method of Lyzenga and an LDA classifier trained on ground truth data from a single scene. The resulting LDA classifier was then applied to other locations and the coral classification accuracy evaluated. When applied to ground truth data from the Palmyra Atoll location in scene path\/row 065\/056, the initial model achieved an accuracy of 80.3%. However, when applied to ground truth observations from another location within the scene, namely, Kingman Reef, it achieved an accuracy of 78.6%. The model was then applied to two additional scenes (Howland Island and Baker Island Atoll), which yielded an accuracy of 69.2% and 71.4%, respectively. Finally, the algorithm was retrained using data gathered from all four sites, which produced an overall accuracy of 74.1%.<\/jats:p>","DOI":"10.3390\/rs10111774","type":"journal-article","created":{"date-parts":[[2018,11,13]],"date-time":"2018-11-13T03:27:31Z","timestamp":1542079651000},"page":"1774","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Evaluation of Spatial Generalization Characteristics of a Robust Classifier as Applied to Coral Reef Habitats in Remote Islands of the Pacific Ocean"],"prefix":"10.3390","volume":"10","author":[{"given":"Justin J.","family":"Gapper","sequence":"first","affiliation":[{"name":"Computational and Data Sciences Graduate Program, Schmid College of Science and Technology, Chapman University, Orange, CA 92866, USA"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9876-3705","authenticated-orcid":false,"given":"Hesham","family":"El-Askary","sequence":"additional","affiliation":[{"name":"Center of Excellence in Earth Systems Modeling &amp; Observations, Chapman University, Orange, CA 92866, USA"},{"name":"Schmid College of Science and Technology, Chapman University, Orange, CA 92866, USA"},{"name":"Department of Environmental Sciences, Faculty of Science, Alexandria University, Moharem Bek, Alexandria 21522, Egypt"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0174-7002","authenticated-orcid":false,"given":"Erik","family":"Linstead","sequence":"additional","affiliation":[{"name":"Schmid College of Science and Technology, Chapman University, Orange, CA 92866, USA"},{"name":"Machine Learning and Assistive Technology Lab (MLAT), Chapman University, Orange, CA 92866, USA"}]},{"given":"Thomas","family":"Piechota","sequence":"additional","affiliation":[{"name":"Schmid College of Science and Technology, Chapman University, Orange, CA 92866, USA"}]}],"member":"1968","published-online":{"date-parts":[[2018,11,9]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"9","DOI":"10.3354\/meps10157","article-title":"Herbivory Effects on Benthic Algal Composition and Growth on a Coral Reef Flat in the Egyptian Red Sea","volume":"476","author":"Jessen","year":"2013","journal-title":"Mar. 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