HIGHROC Products

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High spatial resolution : S2/MSI

General information:

  • sensor: Sentinel-2 / MSI (MultiSpectral Instrument)
  • spatial resolution: 10m
  • temporal resolution: 10 days at the equator
  • parameters: Rrs, SPM, Turbidity, Chlorophyll-a, RGB images
  • regions processed: see map below

Map processed regions for S2/MSI
Regions where HIGHROC S2/MSI products are available

Examples of products

RGB + TSM Gironde
S2/MSI image of the Gironde Estuary on 2017/02/18. Left: real color image. Right: Suspended particulate matter (mg/L)

RGB + TSM + CHL Herault
S2/MSI Image of the south of Montpellier and surrounding of Sète with the mouth and plume of the Hérault on 2016/15/10. Lakes are also visible with from West to East: “étang de Thau”, “Lac de Vic’ and “Etang de l’Or”. Left panel: real color image. Middle panel: suspended particulate matter (mg/L). Right Panel: Chlorophyll-a concentration (mg/m3). Turbid waters are observed all along the coast due to resuspension of sediments by strong winds. The chlorophyll map is interesting with rather high concentrations offshore where the water is not turbid. In lakes, chlorophyll concentration increases from West to East.

Product Validation

First results on product validation show an uncertainty of about 30% on water leaving reflectance. Validation of SPM, chlorphyll-a and turbidity products is still ongoing.

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High spatial resolution : L8/OLI

General information:

  • sensor: Landsat8 / OLI (Operational Land Imager)
  • spatial resolution: 30m
  • temporal resolution: 16 days at the equator
  • parameters: Rrs, SPM, Turbidity, RGB images
  • regions processed: see map below

Map processed regions for S2/MSI
Regions where HIGHROC L8/OLI products are available

Examples of products

RGB + TSM Gironde (L8)
L8/OLI image of the Gironde Estuary on 2017/01/26. Left: real color image. Right: Suspended particulate matter (mg/L)

Product Validation

First results on product validation show a uncertainty of about 17% on water leaving reflectance with a good correlation between in situ and satellite measurements (r2=0.95). Regarding SPM, validation exercises in the Rhone River, Gironde Estuary and Bourgneuf Bay give 38%, 35% and 31% error respectively. Validation of the L8/OLI products in the Norwegian region is still ongoing.

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Moderate spatial and temporal resolution : MODISaqua and VIIRS

General information:

  • sensor: MODISaqua (Moderate Resolution Spectroradiometer)
    • and VIIRS (Visible Infrared Imaging Radiometer Suite)
  • spatial resolution: 500m (MODIS), 750m (VIIRS)
  • temporal resolution: 1 to 2 days
  • parameters: Rrs, SPM, Turbidity, Chlorophyll-a, RGB images
  • regions processed: see map below

Map processed regions for S3p Map processed regions for S3p
Regions where HIGHROC MODIS and VIIRS products are available

Examples of products

CHL + TSM (SNS) MODIS
Chlorophyll-a concentration and Suspended Particulate Matter concentration from MODIS-Aqua in the Southern North Sea on 2017/05/26.

Product Validation

Uncertainty on remote sensing reflectance varies with bands and regions. Lowest uncertainties are generally obtained for the blue bands (443nm) with values ranging between 43% in the Gironde Estuary to 15% in the Rhone River plume, in the Southern North Sea uncertainty is estimated to 29%. Lowest uncertainties are observed for the green band (555nm) and range between 6% (Rhone River plume) and 18% (Southern North Sea). Suspended particulate matter products have varying uncertainties: 9% in the Southern North Sea, 18% in the Rhone River Plume. Chlorophyll concentration and turbidity products could only be validated in the North Sea and Norwegian waters. In the North Sea, an uncertainty of 28% is observed for chlorophyll-a. In Norwegian waters, chlorophyll-a is generally overestimated by satellite products especially in regions of low salinity. Regarding turbidity, an overestimation is observed in both regions although seasonal variability is well reproduced.

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High temporal resolution : MSG/SEVIRI

General information:

  • sensor: Spinning Enhanced Visible and Infrared Imager (SEVIRI) onboard Meteosat Second Generation
  • spatial resolution: 3km at equator
  • temporal resolution: 15 minutes
  • parameters: Rrs, SPM, Turbidity
  • regions processed: see map below

Map processed regions for SEVIRI
Regions where HIGHROC SEVIRI products are available

Examples of products

SPM / 4 regions
SEVIRI products for Suspended Particulate Matter (mg/L). A: Southern North Sea, 2017/04/02 12:00; B: Bay of Biscay, 2017/04/08 08:15; C: Skagerrak, 2017/04/10 09:30; D: Gulf of Lion, 2017/04/09 12:00.

Product Validation

Please note that validation is still ongoing. Present results will be confirmed and completed in the future.

SPM products have been validated in the North Sea region. Results show a slight underestimation of SPM by SEVIRI products and a coefficient of correction of 0.56.