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Irrigated/Non-irrigated Polygons

Irrigated/Non-irrigated Polygons. Background Digitizing Effort Status Future. Farm Service Agency. Creates CLU (common land unit) Administer crop compliance responsibilities CLU metadata circa 2005. 2 year editing effort. 18 Counties Over 214,000 polygons. Clipped to model extent.

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Irrigated/Non-irrigated Polygons

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  1. Irrigated/Non-irrigated Polygons Background Digitizing Effort Status Future

  2. Farm Service Agency • Creates CLU (common land unit) • Administer crop compliance responsibilities • CLU metadata circa 2005

  3. 2 year editing effort 18 Counties Over 214,000 polygons

  4. Clipped to model extent Dataset useful for Other projects

  5. Evolution of CLU editing • As-is • 15-class land classification • Balance • Close enough

  6. DIGITIZING EFFORT

  7. NDVINormalized Difference Vegetation Index • A by-product of the METRIC processing • Exploits strong spectral reflectance difference between red and near-infrared measurements • Directly related to photosynthetic capacity and energy absorption • NDVI values fall between -1.0 and +1.0

  8. NDVI 255 Spectral classes NDVI Date #1 NDVI Date #2 NDVI Date #3 Per pixel Classification Per Field Classification (75%) Final Review

  9. NON-IRRIGATED

  10. IRRIGATED

  11. SEMI-IRRIGATED

  12. STATUS

  13. IRRIGATION STATUS Irrigated Non-irrigated Semi-irrigated

  14. FUTURE

  15. 2002 CLU edits • Work with NDVI images to find changes between years • 1-meter statewide NAIP was flown this summer – near-infrared band included

  16. QUESTIONS?

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