irrigated/non-irrigated polygons
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
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?