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  1. Towards achieving continental scale field validation and multi-sensor interoperability of satellite derived surface reflectance in AustraliaMedhavy Thankappan1, Guy Byrne1, Fuqin Li1, Simon Oliver1, Tim Malthus2 , Cindy Ong2 , Ian Lau21Geoscience Australia 2Commonwealth Scientific and Industrial Research Organisation

  2. Outline • Digital Earth Australia • National validation campaign Protocols /planning / logistics Validation sites Field instrument calibration Data collection - Lake George • National spectral data repository • Multi-sensor interoperability • Summary

  3. Australian digital infrastructure for analysis of Earth observations Aim - to streamline government business and support economic growth Provide Australian industry with standardised, analysis ready data for innovative products / services Australian Government funding of $15.3M over two years Digital Earth Australia http://www.ga.gov.au/about/projects/geographic/digital-earth-australia

  4. National validation campaign • Continental scale validation of surface reflectance • Project Agreement with GA (16 Feb 2018), for CSIRO to coordinate field data collection • Two phases of field data acquisition, near-coincident with satellite overpass • Field data to be managed as a national collection

  5. Protocols/ planning / logistics • Best practice protocols for validation • Field data collection schedule linked to satellite overpass calendars • Common protocols for coordinated data acquisition by multiple teams • Multi-temporal field data

  6. Validation sites

  7. Field instrument calibration • QA/QC of field spectroradiometers • Dark noise, noise equivalent delta radiance (NE L), wavelength check, signal-to-noise ratio • Cross calibration of instruments / reference panels NE L Dark noise

  8. Recent field testsat Lake George, NSW

  9. Early results from field testing • Tested measurement protocols and instruments in the field • Spectral data collection Reflectance Reflectance Central Wavelength (nm) Wavelength (nm)

  10. Validation system elements 1 3 4 Protocols and sampling strategy QA4EO protocols, best practice guidelines for EO validation Validation system Validation campaigns Sampling strategy for field measurements Scheme for airborne measurements Database sub-system Coordinated ground airborne and satellite based data collection in line with sampling strategy and protocols 2 Field sites for observing multiple variables (Supersites) and instruments Scale transform sub-system Field / airborne measurements at different scales Upscaling Accuracy evaluation sub-system Field instrument calibration / cross calibration

  11. National spectral data repository • Proposal to establish a national spectral library for validation • Host field and reference spectral data obtained by spectroradiometers using SPECCHIO • Community based governance model with open access

  12. Multi-sensor interoperability of Analysis Ready Data • Sensitivity Analysis for: • Solar angle: BRDF normalized to 25, 45 (control) and 70 degrees. • Aerosol change: aerosol optical depth 0.05, 0.15, 0.25. 0.5 (control: best observed) • Water vapour: 0.5, 2, 3.5 (control: NCEP) • BRDF: temporal average (control: MODIS MCD43)

  13. Temporal stability of Analysis Ready Data • GA NBAR/T/Lambertian and LEDAPS/LaSRC • Statistical summaries: • Invariant targets within scene • Points coincident with field spectra • Polygonal statistics over homogenous targets • Tools for future inter-comparison e.g. GA NBAR vs sen2cor

  14. Summary • The Digital Earth Australia initiative is supporting continental scale validation of surface reflectance using best practice protocols • A nationally coordinated effort will enable field data collection synchronous with satellite overpass, across multiple sites • Field data will be managed as a national collection with open access, and contribute to development of an end-to-end validation system • Work on interoperability of multi-source Analysis Ready Data is progressing and will benefit from field validation

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