Irrigated/Non-Irrigated/Non-irrigated Polygonsirrigated Polygons

BackgroundBackground

Digitizing EffortDigitizing Effort

StatusStatus

FutureFuture

Farm Service Farm Service AgencyAgency

• Creates CLU (common land unit)

• Administer crop compliance

responsibilities

• CLU metadata circa 2005

2 year

editing

effort18

Counties

Over214,000polygon

s

Clipped to

model extent

Datasetuseful for

Otherprojects

Evolution of CLU Evolution of CLU editingediting

•As-is•15-class land classification•Balance•Close enough

DIGITIZING DIGITIZING EFFORTEFFORT

NDVINDVINormalized 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

NDVIDate #1

NDVIDate #2

NDVIDate #3

NDVI255

Spectralclasses

Per pixelClassification

Per FieldClassification

(75%)

FinalReview

NON-IRRIGATEDNON-IRRIGATED

IRRIGATEDIRRIGATED

SEMI-IRRIGATEDSEMI-IRRIGATED

STATUSSTATUS

IRRIGATION STATUSIRRIGATION STATUS

IrrigatedNon-irrigatedSemi-irrigated

FUTUREFUTURE

2002 CLU edits2002 CLU edits•Work with NDVI images to find changes between years

•1-meter statewide NAIP was flown this summer – near-infrared band included

QUESTIONS?