wingtra One - Mapping Recommendations; Original Data Quality; Image Quality; Light Condition

MappingRecommendations
Thereareseveralrecommendationswecanprovidetoaidyouingeneratingandevaluatingmaps
withWingtraOne.
OriginalDataQuality
ThequalityofthedatacollectedbyWingtraOneisaveryimportantelementinobtaininganaccurate
map.Imagequality,lightcondition,andflightpathoverlaparethethreefactorswhicheffectthemost
onthequalityoftheoriginaldata.
Imagequality
Highresolutionimagesareessentialtoensureasuccessfulstitching(orthophotogeneration).Allof
ourcameraswerethoroughlychosentoguaranteehighqualityimages.Especiallyforprojectswith
highrequirements,itisadvisabletousethefirst-ratesensorRX1RII.Formoredetailsaboutour
diverserangeofsensoroptions,checkoutourhomepage.
Lightcondition
Thedefaultcamerasettingsprovidedbyuscoveralargerangeoflightconditions.Nevertheless,itis
advisabletochecktheimagesafterthefirstflighttomakesuretheimagesarenotunderexposedor
overexposed.Theorthomosaicgenerationfavorsimageswithmanydistinctivefeatureswhichare
constantoverallimages.Therefore,flyingonabrightbutcloudydaywouldbeidealtoprevent
shadowing.Shadowsdarkenareaswhichreducethevisabilityoffeatures.Additionally,itresultsin
appearancechangesbetweenimages,asthepositionofthesunchangesduringtheflight.
Overlap
Thedefaultoverlap(frontandside)parametersaresetto70%,whichisagoodcompromisebetween
stitchingrobustnessanddatavolume.Increasingtheoverlapsimprovesthestitchingqualitybutatthe
sametimetheprocessingtime,includinggeotagging,willincreaseaswell.Thesideoverlapis
additionallylinkedtotheflightdurationasthenumberofrowsincreases.Ontheotherside,thefront
overlapisonlyaffectingthenumberofimages.
Geolocationaccuracy
Flightimagerycanbegeotaggedaftertheflight.Moredetailsaboutthecoordinatesystemofthe
geotagscanbefoundintheImagePostprocessingSoftwareChapter.WhenflyingwithaWingtraOne
withoutPPKthegeotaggingaccuracyofsingleimagesisintherangeofafewmeters.Whenflying
withaWingtraOnewithPPKanabsolutegeotaggingaccuracydownto1cmcanbeachieved.With
bothoptions,theresultingproductshaveahighrelativeaccuracy,whichallowstomeasurelengthsor
volumesaccurately.
Forprojects,wherehighabsoluteaccuracyisrequired,youcaneitheruseaWingtraOnePPKoryou
canaddgroundcontrolpoints(GCPs).WhenflyingwithaWingtraOnewithoutPPK,werecommend
touseatleast5GCPsand3checkpoints.Distinctiveandstablefeaturesonthegroundor
additionallyaddedmarkscanbeused.Thepointsshouldbemeasuredaccuratelyandplacedinorder
thateachpointisvisibleonmultipleimages.MostpostprocessingsoftwareallowtheimportofGCP
coordinatesandprovideaninterfacetomarkthemintheimages.Makesuretospecifythecoordinate
systemandheightsystemcorrectly.
MappingRecommendations
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