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SUMMARY:EESS talk on "In situ and in orbit: Optical properties of surface 
 waters"
DTSTART:20210323T121500
DTEND:20210323T130000
DTSTAMP:20260508T065954Z
UID:c87f3164e24b5eab33b23e2b46e425c9d9c4937f4b1299d32e58bb85
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr Daniel Odermatt\,Tenure Track Group leader\, Remote Sensing
  Group\, Dept. of Surface Waters\, EAWAG\nAbstract:\nThe maturing of optic
 al satellite Earth observation technologies is closely linked to the devel
 opment of field spectroradiometers that measure comparable parameters in s
 itu. For surface water applications\, the most comprehensive reference dat
 asets are acquired by above-surface spectroradiometers mounted on jetties 
 or buoys. These datasets consist of accurate reflectance measurements\, wh
 ich are used for satellite sensor vicarious calibration by all major space
  agencies.\nThe Thetis profiler next to the LéXPLORE platform in Lake Gen
 eva is currently limited to below-surface reflectance measurements\, but i
 t simultaneously acquires absorption and scattering properties. This provi
 des an unprecedented basis for the interpretation of reflectances\, includ
 ing vertical gradients of several bio-physical indicators at sub-diel scal
 e. It furthermore allows for an optical closure via radiative transfer sim
 ulations\, and hence a detailed description of reflectance measurement unc
 ertainties. In this manner\, we can optimize the measurements’ comparabi
 lity with daily observations by the Sentinel-3 satellites\, and thereby mi
 tigate the technical limitations of below-surface measurements.\nBased on 
 Thetis measurements as well as longer but less comparable water quality mo
 nitoring time series\, we currently develop daily primary productivity est
 imates for Switzerland’s largest 20 lakes. The productivity estimated by
  a bio-optical model\, and the underlying chlorophyll-a and Secchi depth e
 stimates from 300 m resolution Sentinel-3 data are made available in www.d
 atalakes-eawag.ch\, within a few hours after acquisition.\nWe envision a s
 imilar system for Sentinel-2 based 20 m turbidity estimates in smaller lak
 es and at higher elevations\, where ground reference measurements and othe
 r ancillary data is currently missing. While preparing to acquire such mea
 surements during the next two summers\, we compiled an inventory of more t
 han 1200 lakes that formed in the Swiss Alps since the Little Ice\, as a r
 esult of the ongoing deglaciation.\n\nShort biography:\nDaniel Odermatt is
  a Tenure Track Group Leader in the Surface Waters department at Eawag. He
 ’s a geographer and glaciologist who is specialized in optical Earth obs
 ervation. He received his Ph.D. from the University of Zurich for a thesis
  on water quality remote sensing. As a Marie-Curie IAPP postdoctoral fello
 w and company founder\, Daniel spent more than five years in the private i
 ndustry where he developed\, on behalf of the European Space Agency (ESA)\
 , global scale satellite Earth observation applications for biodiversity c
 onservation and sustainable development. He recently developed an open sou
 rce Python library (https://gitlab.com/eawag-rs/sencast) to carry on such 
 applications with ESA’s Sentinel satellite data. At closer range\, Danie
 l is exploiting bio-optical measurements and modeling for Swiss lakes.
LOCATION:ZOOM https://epfl.zoom.us/j/84677261593
STATUS:CONFIRMED
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