Published March 6, 2018
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Satellite sensor requirements for monitoring essential biodiversity variables of coastal ecosystems

Creators

  • 1. University of South Florida
  • 2. University of California, Merced
  • 3. University of Maryland, College Park
  • 4. University of Southern California
  • 5. Johns Hopkins University
  • 6. University of California, San Diego
  • 7. Commonwealth Scientific and Industrial Research Organisation
  • 8. Stetson University
  • 9. HySpeed Computing, Miami, Florida, 33143, USA.
  • 10. United States Environmental Protection Agency
  • 11. Goddard Space Flight Center
  • 12. United States Naval Research Laboratory
  • 13. University of California, Los Angeles
  • 14. Goddard Institute for Space Studies
  • 15. City University of New York
  • 16. University of Maine
  • 17. California Institute of Technology
  • 18. Universities Space Research Association
  • 19. Geophysical Fluid Dynamics Laboratory
  • 20. University Corporation for Atmospheric Research
  • 21. Simón Bolívar University
  • 22. Lamont–Doherty Earth Observatory
  • 23. Oregon State University
  • 24. Roffer's Ocean Fishing Forecasting Service, 60 Westover Drive, West Melbourne, Florida, 32904, USA.
  • 25. Alfred Wegener Institute for Polar and Marine Research
  • 26. Stanford University
  • 27. University of Connecticut
  • 28. University of North Dakota
  • 29. University of California, Santa Barbara
  • 30. EcoQuants, 508 East Haley Street, Santa Barbara, California, 93103, USA.
  • 31. Florida Museum of Natural History
  • 32. Woods Hole Oceanographic Institution
  • 33. University of California, Santa Cruz
  • 34. University of Rhode Island
  • 35. WET Labs/Sea-Bird Scientific, P.O. Box 518, Philomath, Oregon, 97370, USA.
  • 36. Ames Research Center
  • 37. Bowdoin College
  • 38. University of Twente
  • 39. Intergovernmental Oceanographic Commission of UNESCO, Ocean Biogeographic Information System, Oostende, Belgium.
  • 40. Yale University

Description

The biodiversity and high productivity of coastal terrestrial and aquatic habitats are the foundation for important benefits to human societies around the world. These globally distributed habitats need frequent and broad systematic assessments, but field surveys only cover a small fraction of these areas. Satellite-based sensors can repeatedly record the visible and near-infrared reflectance spectra that contain the absorption, scattering, and fluorescence signatures of functional phytoplankton groups, colored dissolved matter, and particulate matter near the surface ocean, and of biologically structured habitats (floating and emergent vegetation, benthic habitats like coral, seagrass, and algae). These measures can be incorporated into Essential Biodiversity Variables (EBVs), including the distribution, abundance, and traits of groups of species populations, and used to evaluate habitat fragmentation. However, current and planned satellites are not designed to observe the EBVs that change rapidly with extreme tides, salinity, temperatures, storms, pollution, or physical habitat destruction over scales relevant to human activity. Making these observations requires a new generation of satellite sensors able to sample with these combined characteristics: (1) spatial resolution on the order of 30 to 100-m pixels or smaller; (2) spectral resolution on the order of 5 nm in the visible and 10 nm in the short-wave infrared spectrum (or at least two or more bands at 1,030, 1,240, 1,630, 2,125, and/or 2,260 nm) for atmospheric correction and aquatic and vegetation assessments; (3) radiometric quality with signal to noise ratios (SNR) above 800 (relative to signal levels typical of the open ocean), 14-bit digitization, absolute radiometric calibration <2%, relative calibration of 0.2%, polarization sensitivity <1%, high radiometric stability and linearity, and operations designed to minimize sunglint; and (4) temporal resolution of hours to days. We refer to these combined specifications as H4 imaging. Enabling H4 imaging is vital for the conservation and management of global biodiversity and ecosystem services, including food provisioning and water security. An agile satellite in a 3-d repeat low-Earth orbit could sample 30-km swath images of several hundred coastal habitats daily. Nine H4 satellites would provide weekly coverage of global coastal zones. Such satellite constellations are now feasible and are used in various applications.
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