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Milton defra
- 1. Calibration of remotesensing systems • Field measurements to provide data for atmospheric correction. • Field and laboratory calibration of sensors.
- 2. Validation of EOdata products Biomonitoring of Volatile Organic Compounds (VOC) • Approached by Infoterra Ltd to investigate whether the spectral reflectance of common plant species is affected by exposure to VOCs. • Client : Astra Zeneca PLC (manuf. plant in Macclesfield). control treated treated control Reported results from Astra-Zeneca pilot study
- 3. Methods : jointfield expt with CEH Edinburgh • Six Open-Top Chambers (OTC) • VOC concentrations carefully controlled • Plants grown in trays • Moved indoors to measure spectra • 3 OTC = treatment • 3 OTC = controls • 15 plants per species in each • Measured twice during season
- 4. Over 1000 leafspecimens were measured VOCs : a mixture of Acetone (0.03 mg m-3 ), Acetonitrile (0.0008 mg m-3 ), Dichloromethane (0.0008 mg m-3 ), Ethanol (IMS) (0.004 mg m-3 ), MTBE (0.025 mg m-3 ) and Toluene (0.0015 mg m-3 ). Large database of high quality reflectance spectra...
- 5. Karen at thebeginning of the experiment... and after measuring her 1000th dandelion leaf...
- 6. 0 10 20 30 40 50 60 400 800 12001600 2000 2400 Mean reflectance of leaves from control and treated Dock plants in July. Samples collected from visually senescent leaves have been omitted to demonstrate that mean reflectance of treated and control green leaves is very similar across all wavelengths measured. Treatment Control Reflectance(%) Wavelength (nm)
- 7. control treated treated control • Stray lighterror within the spectroradiometer? • Incorrect removal of the dark current? • One for the Journal of Irreproducible Results... Highlights the need to establish protocols and publicise best practice if remote sensing is to be trusted as a scientific tool.
- 8. Network for Calibrationand Validation of Earth Observation data • Knowledge transfer network. • Around 25 partners - universities, industry and government. • Disseminate best practice through meetings, website & field experiments.
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- 11. © Ordnance Survey,2006 Study area for NCAVEO 2006 Field Experiment
- 12. Aims of NCAVEO2006 Experiment • To determine the accuracy and precision of radiance and reflectance products derived from airborne and satellite sensors (e.g. CASI, CHRIS/PROBA, SPOT). • To validate examples of three products derived from EO data: • Leaf Area Index map • Vegetation Index map (MTCI) • Land Cover map • To document and share emergent best practice in EO product validation. • To consolidate and grow the community of data providers and users interested in quality assurance of EO data products. • To investigate the feasibility of establishing a long-term calibration & validation site in southern England.
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Editor's Notes
- #11Â Welcome to this meeting to begin to plan the 2006 NCAVEO Field Experiment. The NCAVEO Steering Cttee felt that in addition to annual meetings and the forthcoming conference on cal/val (Dec 2006), there should be an opportunity for some hands-on knowledge transfer. Hence this community-led experiment.
- #12Â The orginal plan was to use the Barton Bendish site in Norfolk. Problems with that led to a move to Chilbolton in Hampshire. The area is chalk download south-west of Basingstoke. A wild and desolate part of southern England (relatively speaking...).
- #14Â Welcome to this meeting to begin to plan the 2006 NCAVEO Field Experiment. The NCAVEO Steering Cttee felt that in addition to annual meetings and the forthcoming conference on cal/val (Dec 2006), there should be an opportunity for some hands-on knowledge transfer. Hence this community-led experiment.