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Structural complexity in ecosystems creates an assortment of microhabitat types and has been shown to support greater diversity andabundance of associated organisms. The 3D structure of an environment also directly affects important ecological parameters such ashabitat provisioning and light availability and can therefore strongly influence ecosystem function. Coral reefs are architecturallycomplex 3D habitats, whose structure is intrinsically linked to the ecosystem biodiversity, productivity, and function. The field ofcoral ecology has, however, been primarily limited to using 2-dimensional (2D) planar survey techniques for studying the physicalstructure of reefs. This conventional approach fails to capture or quantify the intricate structural complexity of corals that influenceshabitat facilitation and biodiversity. A 3-dimensional (3D) approach can obtain accurate measurements of architectural complexity,topography, rugosity, volume, and other structural characteristics that affect biodiversity and abundance of reef organisms. Structurefrom-Motion (SfM) photogrammetry is an emerging computer vision technology that provides a simple and cost-effective methodfor 3D reconstruction of natural environments. SfM has been used in several studies to investigate the relationship between habitatcomplexity and ecological processes in coral reef ecosystems. This study compared two commercial SfM software packages, AgisoftPhotoscan Pro and Pix4Dmapper Pro 3.1, in order to assess the cpaability and spatial accuracy of these programs for conducting 3Dmodeling of coral reef habitats at three spatial scales

the international archives of the photogrammetry, remote sensing and spatial information sciences/international archives of the photogrammetry, remote sensing and spatial information sciences

COMPARISON OF COMMERCIAL STRUCTURE-FROM-MOTION PHOTOGRAMMETY SOFTWARE USED FOR UNDERWATER THREE-DIMENSIONAL MODELING OF CORAL REEF ENVIRONMENTS