SWOT and User Needs Workshop, DLR Oberpfaffenhofen, 5-6 July 2006 HYRESSA - HYperspectral REmote Sensing in Europe specific Support Actions Data Processing Eduardo de Miguel Remote Sensing Laboratory INTA - Spain

SWOT and User Needs Workshop, DLR Oberpfaffenhofen, 5-6 July 2006 HYRESSA - HYperspectral REmote Sensing in Europe specific Support Actions Introduction Data processing = Data calibration + quality control + data transformation + information retrieval Both at user side and provider side

SWOT and User Needs Workshop, DLR Oberpfaffenhofen, 5-6 July 2006 HYRESSA - HYperspectral REmote Sensing in Europe specific Support Actions Data Processing Usual DP tasks at provider side: – Radiometric calibration – Geometric correction – Atmospheric correction (might be included in radiometric correction) – Evaluating product accuracy (quality control) Unusual DP tasks at provider side: – Data transformations (PCA, MNF, spectral resampling…)

SWOT and User Needs Workshop, DLR Oberpfaffenhofen, 5-6 July 2006 HYRESSA - HYperspectral REmote Sensing in Europe specific Support Actions Data Processing Usual DP tasks at user side: –Data transformations –Endmember selection –Spectral unmixing, spectral matching... –Classification –Feature detection –Running models –…

SWOT and User Needs Workshop, DLR Oberpfaffenhofen, 5-6 July 2006 HYRESSA - HYperspectral REmote Sensing in Europe specific Support Actions Standard tools –Radiometric calibration: linear models –Geometric correction: direct geo-referencing –Atmospheric correction: MODTRAN and relatives (ATCOR, ACORN, FLAASH), ATREM, vicarious calibration (empirical line) –Temperature/emissivity separation: TES, others??

SWOT and User Needs Workshop, DLR Oberpfaffenhofen, 5-6 July 2006 HYRESSA - HYperspectral REmote Sensing in Europe specific Support Actions Standard tools –Spectral tools: … –Transforms: … –Classification: … –Filters and convolutions: … (See ENVI as show-case of standard tools)

SWOT and User Needs Workshop, DLR Oberpfaffenhofen, 5-6 July 2006 HYRESSA - HYperspectral REmote Sensing in Europe specific Support Actions Standard tools –Quality control & accuracy measures: ?? –Metadata definition: none (ISO19115??) –Metadata documentation/distribution: none –Data inventory/catalogues: none

SWOT and User Needs Workshop, DLR Oberpfaffenhofen, 5-6 July 2006 HYRESSA - HYperspectral REmote Sensing in Europe specific Support Actions SWOT Strengths and Weakness (I) –Geo-registration procedures satisfactory. (It is re-sampling correctly addressed?) –Radiometric/atmospheric correction is often close to 5% error in reflectance units. –Reporting geometric accuracy is not clear. –Reporting radiometric accuracy requires ground spectra / temperature.

SWOT and User Needs Workshop, DLR Oberpfaffenhofen, 5-6 July 2006 HYRESSA - HYperspectral REmote Sensing in Europe specific Support Actions SWOT Strengths and Weakness (II) –BRDF effects (and emission angular effects) are still outside of the standard processing pipeline. –Temperature/Emissivity algorithms far from being operational. –Metadata are not provided in a regular basis nor in a standard way

SWOT and User Needs Workshop, DLR Oberpfaffenhofen, 5-6 July 2006 HYRESSA - HYperspectral REmote Sensing in Europe specific Support Actions

SWOT and User Needs Workshop, DLR Oberpfaffenhofen, 5-6 July 2006 HYRESSA - HYperspectral REmote Sensing in Europe specific Support Actions Developments A review of DP topics in the 2004 EARSel SIG IS workshop and the 2006 IGARSS. –Endmember extraction, spectral unmixing, advanced classification procedures… –BRDF modelling –Compression –Others –Nothing on quality/accuracy measures and metadata

SWOT and User Needs Workshop, DLR Oberpfaffenhofen, 5-6 July 2006 HYRESSA - HYperspectral REmote Sensing in Europe specific Support Actions Discussion Points It is geometric resampling a problem? How to evaluate the geometric accuracy? Which is the way to reduce the 5% error in atmospheric correction? Should the spectral unmixing be performed at the provider side? (it is affected by instrument features, like PSF and spatial sampling)

SWOT and User Needs Workshop, DLR Oberpfaffenhofen, 5-6 July 2006 HYRESSA - HYperspectral REmote Sensing in Europe specific Support Actions Discussion Points It is worth to put effort on data compression? When will be BRDF correction a common practice? What is the users feeling about metadata? … (Your entry here)