Hyperspectral Remote Sensing of Cotton Crops: Detecting Cotton Stress and Canopy Water Content

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Hyperspectral Remote Sensing of Cotton
CropsDetecting Cotton Stress and Canopy Water
Content

• Susan Ustin and Jonathan Greenberg
• CSTARS, U.C. Davis

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Comparison of multispectral and hyperspectral
sensors
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Does hyperspectral data give a grower more
information than multispectral?
True Color Image of Cotton Fields
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Can continuum removal values serve as a proxy for
pressure bomb measurments?
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Can continuum removal data assist in timing
defoliant application?
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What is next?

• Ground truth 2000 AVIRIS images with pressure
  bomb readings.
• Determine the effectiveness of continuum removal
  analysis in predicting pressure bomb readings and
  true leaf water content across the entire growing
  season with field spectrophotometers.
• Determine the relationship between red edge
  position and chlorophyll content.
• Increase the temporal coverage of the Sheely
  fields through the use of a UAV (currently under
  development).
• Test the effectiveness of hyperspectral remote
  sensing in detecting insect-specific stress.

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What do we need?

• A highly georectified image (lt 2 m.) of the
  Sheely fields for use in ground truthing aerial
  imagery.
• High resolution satellite imagery like IKONOS (at
  right) will probably be the best route for a
  georectified base image.
• Field researchers taking GPS readings of their
  point samples, beginning this coming growing
  season.
• Standardized form of data sharing.

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What do you need?

• We have compiled a relatively complete database
  from the 1999 and 2000 growing seasons field
  research, organized by field and subfield.
• CSTARS members could potentially train field
  researchers in the use and application of GPS.
• We can provide ground spectrophotometer and
  aerial hyperspectral AVIRIS data.
• We have developed software for determining red
  edge and continuum removal values for
  hyperspectral data.