1 / 9

Become “spectrally aware” !

A validation case study conducted at the Southern Great Plains site using high spectral resolution measurements to determine the IR emissivity of grass vegetation and bare soil. Aircraft validation measurements show a linear combination of vegetation and bare soil, with best fit obtained when spectral variance in emissivity is minimized.

lilliano
Download Presentation

Become “spectrally aware” !

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. 12 m 9 m 4 m UW AERIbago Become “spectrally aware” ! 1.0 Grass Vegetation Emissivity Bare Soil • ARM SGP site is dominated by two land cover types “grass vegetation” and “bare soil”. • U. of Wisconsin measured the IR emissivity at high spectral resolution. 0.75 500 3000 Wavenumber (cm-1)

  2. Tskin = 295.4 K Validation Case Study: Southern Great Plains Site S-HIS Observation • Best fit to Tskin when spectral variance in emissivity is minimum.

  3. 12 m 9 m Aircraft validation measurements are consistent with a linear combination of vegetation and bare soil. Pure Vegetation 1.0 Aircraft S-HIS LSE S-HIS OBS Bare Soil 0.85 Wavenumber (cm-1)

  4. Infrared Radiative Transfer Equation (lambertian surface) SurfaceEmission Surface Reflection Ndn (60deg) Skin Temperature & Surface Emissivity

  5. Emissivity Survey • ARM SGP site is dominated by two land cover types “pasture” and “wheat”. • Notice that the measured wheat field emissivity can be approximated by a linear combination of pure scene types; bare soil and grass.

  6. IR Land Surface Signatures: QUARTZ 0.5 Solid > 75 m Coarse R > 2 m & < 75 m Fine 0.0 0.5 R 0.0 • QUARTZ Reflectivity (JPL Spectral Library from Lab Tests).

  7. IR Land Surface Signatures: QUARTZ 1.0 1-R Solid Coarse > 75 m > 2 m & < 75 m Fine 0.5 1.0 1-R 0.5 • QUARTZ Emissivity (JPL Spectral Library from Lab Tests).

  8. IR Land Surface Signatures: JPL Library 0.5 Granite Sandy Loam R Quartz (coarse grain) 0.0 0.5 R 0.0 • QUARTZ Emissivity (JPL Spectral Library from Lab Tests).

  9. IR Land Surface Signatures: JPL Library 1.0 1-R 0.5 1.0 1-R Granite Sandy Loam Quartz (coarse grain) 0.5 • QUARTZ Emissivity (JPL Spectral Library from Lab Tests).

More Related