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ApplicationResearchofGreenVegetationExtractionMethodBasedonUAVImage

  

  1. (1.FacultyofGeomaticsEngineering,KunmingMetallurgyCollege,Kunming650033,China;
    2.NanjingShuweiSurveying&MappingCo.Ltd.,Nanjing211808,China;
    3.TheFirstSurveyingandMappingInstituteofQinghaiProvince,Xining810000,China;
    4.CollegeofPublicAdministration,NanjingAgriculturalUniversity,Nanjing210095,China)
  • Online:2020-04-03 Published:2020-04-03

Abstract: Inthispaper,thevegetationindexsuitableforUAVimageextractionisobtainedthroughtheanalysisandcomparisonofvariousvegetationindexesthroughdatastatistics.Firstly,grayimagesweregeneratedforeachvisiblevegetationindexbyUAVimages.Then,vegetationandnonvegetationpixelclassificationthresholdsareobtainedaccordingtohistogram bimodalmethodoriterativethresholdmethod, andtheoptimalthresholdisusedtoextractvegetationinformationfrom thegrayscaleimagesofvegetationindex.Finally,theprecisionofvegetationinformationextractionindexesarecompared.ItshowsthattheaccuracyofEXGandVDVIishigherthanothervegetationindexes.InordertoverifytheaccuracyofEXGandVDVI,anotherorthophotoimageisselectedfromthesameperiodimagesandextractedvegetationinformationwiththesamemethod.TheresultshowsthatEXGandVDVIbasedonUAVimagescanaccuratelyextractvegetationinformationwithanextractionaccuracyofmorethan90%,whichbecomeanimportanttechnicalmeanstoextractgreenvegetationcoveragebyusingUAVimages.

Key words: UAVimage, vegetationindex, classificationthresholds

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