Open AccessCost-Effective Coastal Habitat Mapping: Detecting Intertidal Polychaete Aggregations with Low-Altitude Photogrammetry
Author(s) -
Renata Mamede da Silva Alves,
C. Van Colen,
Marijn Rabaut,
Alain De Wulf,
Magda Vincx,
Cornelis Stal
Publication year - 2019
Publication title -
photogrammetric engineering and remote sensing
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 127
eISSN - 2374-8079
pISSN - 0099-1112
DOI - 10.14358/pers.85.12.899
Subject(s) - intertidal zone , photogrammetry , habitat , digital elevation model , geography , polychaete , remote sensing , orthophoto , reef , terrain , calidris , environmental science , fishery , cartography , ecology , physical geography , oceanography , geology , biology
Intertidal polychaete aggregations may be protected in the European Union under the Habitats Directive framework as reef habitats. Remote reef mapping remains challenging due to severe and dynamic conditions, as well as cover and spatial resolution requirements. This study (1) evaluated kite aerial photography and low-altitude digital photogrammetry to map and monitor intertidal aggregations of a sessile tube-building polychaete, Lanice conchilega (L. conchilega), and (2) developed a protocol for its remote identification. Monthly campaigns yielded 12 aerial image sets which were processed using structure-from-motion into high-precision digital terrain models and orthophoto mosaics. Maximum likelihood classification distinguished L. conchilega from bare sediment with an accuracy of 70% ± 23.2%. Aggregations were delineated by extracting elements of positive elevation from local difference models. The method has proven useful to detect high-value aggregations, distinguishing these consistently. Nevertheless, systematic biases were present during delineation, and further characterisation of reference aggregations may improve detection.