@article{fdi:010095950,
  title = {{M}ultisource mapping of lagoon bathymetry for hydrodynamic models and decision-support spatial tools : the case of the {G}ambier {I}slands in {F}rench {P}olynesia},
  author = {{A}ndr{\'e}fou{\¨e}t, {S}erge and {B}ruy{\`e}re, {O}. and {T}rophime, {T}.},
  editor = {},
  language = {{ENG}},
  abstract = {{P}recise lagoon bathymetry remains scarcely available for most tropical islands despite its importance for navigation, resource assessment, spatial planning, and numerical hydrodynamic modeling. {H}ydrodynamic models are increasingly used for instance to understand the ecological connectivity between marine populations of interest. {I}sland remoteness and shallow waters complicate in situ bathymetric surveys, which are substantially costly. {A} multisource strategy using historical point sounding, multibeam surveys and well calibrated satellite-derived bathymetry ({SDB}) can offer the possibility to map entirely extensive and geomorphologically complex lagoons. {T}he process is illustrated here for the rugose complex lagoon of {G}ambier {I}slands in {F}rench {P}olynesia. {T}he targeted bathymetry product was designed to be used in priority for numerical larval dispersal modeling at 100 m spatial resolution. {S}patial gaps in in situ data were filed with {S}entinel-2 satellite images processed with the {I}terative {M}ulti-{B}and {R}atio method that provided an accurate bathymetric model (1.42 m {M}ean {A}bsolute {E}rror in the 0-15 m depth range). {P}rocessing was optimized here, considering the specifications and the constraints related to the targeted hydrodynamic modeling application. {I}n the near future, a similar product, possibly at higher spatial resolution, could improve spatial planning zoning scenarios and resource-restocking programs. {F}or tropical island countries and for {F}rench {P}olynesia, in particular, the needs for lagoon hydrodynamic models remain high and solutions could benefit from such multisource coverage to fill the bathymetry gaps.},
  keywords = {multibeam bathymetry ; satellite derived bathymetry ; {SHOM} ; pearl farming ; spatial planning ; hydrodynamic modeling ; {LIDAR} bathymetry ; {POLYNESIE} {FRANCAISE} ; {GAMBIER}},
  booktitle = {},
  journal = {{G}eomatics},
  volume = {5},
  numero = {4},
  pages = {81 [18 p.]},
  year = {2025},
  DOI = {10.3390/geomatics5040081},
  URL = {https://www.documentation.ird.fr/hor/fdi:010095950},
}