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- W597291953 abstract "En karta ar en farskvara som ar i standigt behov av ajourhallning. Ajourhallning gors normalt med traditionella metoder: fotogrammetriska och/eller geodetiska. Men i och med att utvecklingen gar framat har intresset for en ny metod, UAS (Unmanned Aerial Systems), okat. UAS ar en relativt ny fotogrammetrisk metod dar obemannade flygfarkoster anvands. Detta examensarbete har utvarderat vilken osakerhet vanligt forekommande detaljer i en karta kan fa i framstallda produkter som genererats med hjalp av UAS-bilder som georefererats med naturliga stodpunkter. Produkterna som framstalldes var en digital ytmodell och ett ortofoto och togs fram i datorprogrammet Agisoft Photoscan. Bilderna som bearbetades i denna studie erholls fran Swecos UAS-flygning och var tagna over deponiomradet Fagelmyra i Ornas, Dalarnas lan. I den digitala ytmodellen och i ortofotot mattes detaljer in for att sedan kontrolleras mot kontrollpunkter inmatta med natverks-RTK (Real-Time Kinematic). Studien visade att detaljer inmatta i den digitala ytmodellen och ortofotot resulterade i en osakerhet pa 0,28 m respektive 0,08 m i plan. Varfor osakerheterna skiljer sig mellan den digitala ytmodellen och ortofotot kan ha att gora med att det ar svart att identifiera objekt i den digitala ytmodellen. Utifran denna studie kan det konstateras att UAS och georeferering med naturliga stodpunkter lampar sig for kartering av mindre omraden. Dessutom kan det konstateras att UAS ar effektiv och relativt enkel teknik. %%%% A map is in constant need of being updated. Map updating is normally performed with traditional methods such as photogrammetric and/or geodetic. But by technical development the interest in new methods has increased, like in UAS (Unmanned Aerial Systems). UAS is a relatively new photogrammetric method using unmanned aerial vehicles (UAV). The purpose of this study is to evaluate what uncertainty common details in a map can get in generated from UAS images georeferenced with natural ground control points. The products that were generated was a digital surface model and an orthophoto and was produced in the software Agisoft Photoscan. The images that were processed in this study were obtained from Sweco’s UAS flight and taken over landfill area Fagelmyra in Ornas, Dalarna county. In the digital surface model and the orthophoto details were measured and controlled against check points surveyed with Network RTK (Real-Time Kinematic). The study has shown that the surveyed details in the digital surface model and ortohophoto resulted in a planimetric uncertainty of 0.28 m and 0.08 m, respectively. The reason for why the uncertainties for the digital surface model and orthophoto are different may be that it is difficult to identify objects in the digital surface model. Based on this study it can be concluded that UAS and georeferencing with natural ground control points is suitable for mapping of smaller areas. In addition, it can be concluded that UAS is efficient and relatively easy technique." @default.
- W597291953 created "2016-06-24" @default.
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- W597291953 date "2013-01-01" @default.
- W597291953 modified "2023-09-27" @default.
- W597291953 title "Osäkerhet vid fotogrammetrisk kartering med UAS och naturliga stödpunkter" @default.
- W597291953 cites W186669090 @default.
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- W597291953 hasPublicationYear "2013" @default.
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