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Landsat Data Continuity Mission

Landsat Data Continuity Mission. Linking Thermal and Reflective Properties to Assess Water Resources. John Schott RIT. Overview. * Use aerial imagery to describe 3D fluid flow in plumes. Visible Image of Charlotte Pier. Profile: 3D Model of Fluid Flow and Sediment Transport.

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Landsat Data Continuity Mission

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  1. Landsat Data Continuity Mission Linking Thermal and Reflective Properties to Assess Water Resources John Schott RIT

  2. Overview * Use aerial imagery to describe 3D fluid flow in plumes. Visible Image of Charlotte Pier Profile: 3D Model of Fluid Flow and Sediment Transport Thermal Image of Charlotte Pier

  3. The Procedure: Reflective • 3 major constituents in water: CHL, CDOM, SM. • Varying the concentrations of the 3 constituents results in different reflective spectra.

  4. The Procedure: Reflective • We can create a LUT of the various spectra. • We use the LUT to tell us the concentration of the 3 constituents in an imaged water pixel.

  5. The Procedure: Reflective ST image data λ TRUE min [(ST - SP)2 ] FALSE LUT SQ Error [CHL] [TSS] [CDOM] [ C ] [CDOM ] [ SM ] Sp predicted

  6. The Procedure: Thermal Data • We want to develop a hydrodynamic model of subsurface flow. • Invert image data to surface temperatures. • Varying Inputs (flow rate, met data, etc) of hydrodynamic model, we can use thermal data to “calibrate” model.

  7. The Procedure: Thermal Data • Use hydrodynamic model to predict 3D distribution of sediment in receiving waters. • Use reflective data to “calibrate” prediction. Adjust loadings until predicted optical properties match observation.

  8. Where Are We Now? AVIRIS Resample ETM+ Hydrolight NEXT

  9. Where are we now? • How does each sensor perform in detecting a pixel’s concentration of the 3 constituents? • 200 pixels tested and each sensor’s performance evaluated.

  10. Where are we now? • AVIRIS has smallest RMS error followed by Next, then ETM+. • We want to retry process with quantization. • Does 12-bit quantizer in ‘Next’ further drive down RMS.

  11. Where are we now? • Above numbers represent the standard deviation of the LUT’s error in picking correct constituent concentration. • We want to retry process with quantization. • Does 12-bit quantizer in ‘Next’ further drive down standard deviation.

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