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Framställning av primärkarta över Furuviks djurpark, Gävle, med hjälp av UAS
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
2016 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [sv]

Syftet med detta arbete har vart att ta reda på vilken osäkerhet man kan få i plan och höjd vid kartering med UAS. Arbetet kommer redogöra för hur en karta (primärkarta) framställs över en avgränsad del av Furuviks djurpark, belägen i södra delen av Gävle kommun, med hjälp av UAS. Flygningen skedde på en solig dag med flyghöjden 112 m.

En digital höjdmodell (DEM) och en ortofotomosaik skapades i PhotoScan utifrån de bilder som togs under flygningen över studieområdet. Primärkartan digitaliserades sedan i ArcMap utifrån ortofotomosaiken med höjdangivelse utifrån DEM. Vid inmätningar av stöd och kontrollpunkter användes en GNSS-mottagare med antenn från Leica ansluten till SWEPOS Nätverks-RTK (Real Time Kinematic).

Kontroll av den genererade DEM gjordes i analogi med SIS-TS 21144:2013 där den totala medelavvikelsen i området blev -0,006 m med en standardosäkerhet på 0,047 m. Vid en analys av medelavvikelsen i höjd för varje enskild kontrollprofil, uppstår ett fenomen. De profilerna där flygblocken överlappade varandra hade ett höjdvärde som låg över den genererade DEM medan de övriga profilernas höjdvärden låg under DEM. Detta fenomen kan ha orsakats av skuggområden i bilderna vid bildmatchningen utförd i PhotoScan.

Kartan kontrollerades i plan där en lägeskontroll av de digitaliserade kartobjekten genomfördes. Ett Root Mean Square error (RMS-värde) beräknades fram till 0,054 m vilket är något högre än det i HMK-Geodatakvalitet rekommenderade för primärkartor på 0,050 m.

Även tidsåtgången med kartering med hjälp av UAS undersöktes i detta arbete. 70 procent av den totala tidsåtgången för förberedelser, flygning och insamling av data gick till inmätningen av flygsignalerna med GNSS-RTK i denna studie.

Abstract [en]

Map production by using unmanned aircraft, is a method that is of high interest in the world. There are different names for the technology that manages the unmanned aircraft. Unmanned Aerial System (UAS) refers to the vehicle and the systems that are necessary to control the vehicle from distance. An UAS position and orientation are known in the air by the integrated GNSS- and navigation systems.

The purpose of this work, is to find out which uncertainty one can get in plan and elevation using UAS. The work will describe how a map (ground map) is produced, using UAS, over a limited area of Furuvik Zoo, located in the southern part of the municipality of Gävle. The flight took place on a sunny day with the flying altitude 112 m.

A digital elevation model (DEM) and an orthophoto is created in Photo Scan based on the images that were taken during the flight over the study area. The ground map was digitized in ArcMap with altitude readings based on the digital elevation model. During the measurements of ground control targets and control points, a GNSS receiver with antenna of the model Leica connected to SWEPOS Network RTK (Real Time Kinematic) was used.

Control of the produced DEM was made in analogy with SIS TS 21144:2013 where the average height deviation of the area was 0,006 m with a standard uncertainty of 0,047 m. In an analysis of the mean deviation in height of each control profile, a phenomenon arises. The control profiles located in the area where the two flying areas overlapped has a height value over the generated DEM while the other profiles had a height value lower than the generated DEM. This phenomenon may have been caused by the shadow areas in images during the image matching in PhotoScan.

The ground map produced in this study was controlled in plane where the position control of the digitized map objects were carried out. A root mean square error (RMS-value) was calculated to be 0,054 m, which is slightly higher than that in HMK-Geodatakvalitet recommended for ground maps (0,050 m).

The time needed for mapping using the UAS were also examined in this work. Our study shows that 70 percent of the total time required for preparation, flight and data collection went to the measuring of ground control targets with GNSS-RTK.

Place, publisher, year, edition, pages
2016. , 28+bilagor p.
National Category
Other Civil Engineering
Identifiers
URN: urn:nbn:se:hig:diva-22040OAI: oai:DiVA.org:hig-22040DiVA: diva2:945217
External cooperation
AB Furuviksparken
Subject / course
Lantmäteriteknik
Educational program
Surveying
Supervisors
Examiners
Available from: 2016-07-02 Created: 2016-06-30 Last updated: 2016-07-02Bibliographically approved

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