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GOES-R HES-CW Applications, Products and Performance Requirements

GOES-R HES-CW Applications, Products and Performance Requirements. Curtiss O. Davis Code 7203 Naval Research Laboratory Washington, DC 20375 curtiss.davis@nrl.navy.mil (202) 767-9296. NOAA HES-CW Applications. Water quality monitoring Coastal hazard assessment Navigation safety

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GOES-R HES-CW Applications, Products and Performance Requirements

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  1. GOES-R HES-CW Applications, Products and Performance Requirements Curtiss O. Davis Code 7203 Naval Research Laboratory Washington, DC 20375 curtiss.davis@nrl.navy.mil (202) 767-9296

  2. NOAA HES-CW Applications • Water quality monitoring • Coastal hazard assessment • Navigation safety • Human and ecosystem health awareness • Natural resource management in coastal and estuarine areas • Climate variability prediction (e.g., carbon cycle) • Landscape changes • Coral reef detection and health appraisal

  3. Products • Chlorophyll • Reflectance • Turbidity • Particulate absorption • Dissolved absorption • Diffuse attenuation • Backscatter • Fluorescence • TSM • POC • Other?

  4. HES-CW Measurements • Calibrated at sensor radiances for all channels • Either the threshold 14 channels and possibly the additional goal channels • Measurements are geo-located to approximately 1 Ground Sample Distance (GSD) • Methods for on-orbit calibration and validation of products are not clearly defined at this time. • Methods for atmospheric correction are not clearly identified at this time.

  5. Key Threshold and Goal Requirements

  6. More Requirements • Sampling Frequency: • Threshold requirement is to sample the entire U.S. coastal waters once every three hours • Goal is hourly • Additional sampling for selected regions at higher frequency • Daylight hours only • May be adjusted for cloud cover; use Advanced Baseline Imager (ABI) to select cloud free areas for imaging • Simultaneity for imaging spectral channels • Some instrument designs (e.g. filter wheel spectrometer) image channels sequentially • Current requirement is 15 sec based on the simultaneity requirement for ABI which is based on the speed of high altitude clouds; can this be relaxed to 20 or 30 seconds? • Many other requirements for stability, jitter, etc.

  7. Frequency of Sampling • Threshold requirement is to sample all U. S. coastal waters (except Alaska which is not imaged) once every three hours during daylight • Additional hourly sampling of selected areas • Goal requirement is hourly sampling of all U.S. coastal waters • Frequency of sampling may be tied to HES architecture • If HES is one instrument then sampling of coastal waters will be strictly limited to fit around the Disk Sounding task that will take up to 50 min and is required hourly. • Separate HES-CW instrument could offer much more flexibility. • May mean accepting threshold requirements for SNR, etc. • Additional goal requirement of Open Ocean (OO) sampling • Is this a priority, or is MODIS, etc. adequate? • Should we recommend selected areas, such as the Caribbean, Bahamas, South American Coast, etc.?

  8. Multispectral or Hyperspectral? • Are the threshold 14 channels adequate? • Are they the right channels? • What channels should we trade or add? • 380 nm? 360 nm? • Given the option to add something we should go for hyperspectral in the VNIR • Each channel must be justified by its use.

  9. Signal-to-Noise Ratio (SNR) • Threshold requirement is 300:1 for ocean radiances • Initial requirement for SeaWiFS; but SeaWiFS performance greatly exceeded this (more like 450:1) • Goal requirement is 900:1 for ocean radiances • Exceeds MODIS SNR • Difficult and costly to achieve • SNR goes up as the square root of the signal • The main noise source is shot noise • Do we need more than the threshold 300:1? If so are we happy with 400:1?, 500:1? • Is the threshold ok for some channels, but not others? If so which channels do we need more SNR?

  10. Spatial Resolution • The spatial resolution is at Nadir (over the Equator) so it degrades by latitude in U. S. coastal waters. • The threshold requirement is 300 m at nadir; order 400-450 m in U. S. Coastal waters. • Is this adequate? • The goal requirement is 150 m (200 m over U. S.). It will be very expensive to achieve this higher resolution. • Cost goes as the square of the spatial resolution improvement • May not be possible for our SNR, etc. • Will compete with frequency of coverage, SNR, and number of bands.

  11. Use Existing Data Sets to Demonstrate Science and Products SeaWiFS 1 km data PHILLS-2 9 m data mosaic Near-simultaneous data from 5 ships, two moorings, three Aircraft and two satellites collected to address issues of scaling in the coastal zone. (HyCODE LEO-15 Experiment July 31, 2001.) Sand waves in PHILLS-1 1.8 m data Fronts in AVIRIS 20 m data

  12. HES-CW Ocean and Cloud Radiance Values

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