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Noggrannhetskontroll av laserdata för ny nationell höjdmodell
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
2010 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [sv]

Ny nationell höjdmodell är ett projekt som utförts av Lantmäteriet på begäran av regeringen sedan år 2009 och beräknas vara färdigt år 2016. Datainsamling sker med hjälp av flygburen laserskanning. Syftet med studien är att kontrollera noggrannheten av laserdata som ska användas för framställning av ny nationell höjdmodell i Sverige. Noggrannhetskontrollen utfördes på området Årsunda – Ockelbo (syd – nord) och Storvik – Forsbacka (väst – öst). Kvalitetskontroll av laserdata/Digital höjdmodell (DHM) har varit en viktig fråga i flygburen laserskanning genom åren. Vid noggrannhetskontroll val-des att utgå ifrån ett mätningsutförande med profiler enligt Teknisk specifikation SIS-TS 21145:2007 ”Byggmätning – Statistisk provning av digital terrängmodell”. Markslagstyper som undersökts är as-faltyta, barrskog, gräsyta, kalhygge, lövskog, mosse och ängsmark. Mjukvaran TerraScan användes för noggrannhetskontroll av laserdata. Lantmäteriet har som krav att RMS ej får överstiga 0,2 m på öppna, plana och väldefinierade ytor. Detta krav uppfylls för alla markslagtyper. Noggrannheten i laserdata påverkas bl.a. kuperingsgrad och vegetation. Ytterligare studier är önskvärda för jämförelse mellan olika grader av kupering i samma markslagstyp.

Abstract [en]

The new national elevation model is a project undertaken by the National Land Survey at the request of the government since 2009 and is expected to be completed in 2016. Data collection is performed by means of airborne laser scanning. The purpose of this study is to verify the accuracy of laser data to be used for the production of new national height model in Sweden. Accuracy assessment was con-ducted in the area Årsunda – Ockelbo (south-north) and Storvik – Forsbacka (west-east). Quality as-surance of laser data/Digital elevation model (DEM) has been an important issue in airborne laser scanning through the years. The accuracy assessment was conducted using measurement of profiles according to Technical Specification SIS-TS 21145:2007 “Engineering survey for construction works – Statistical test of digital terrain model”. The terrain types investigated is asphalt, coniferous forest, grass surface, clear cut forest, deciduous forest, bog and grassland. TerraScan software was used for accuracy assessment of laser data and measurements of reference points. National Land Survey has announced that RMS should not exceed 0.2 m in open, flat and well-defined surfaces. This demand is met for all land types. The accuracy of laser data is influenced by the variation of the elevations and the density of the vegetation. Further studies are needed for comparison of different degrees of terrain roughness in similar terrain types.

Place, publisher, year, edition, pages
2010. , viii+45+bilagor p.
Keyword [sv]
laserscanning, ny nationell höjdmodell, noggrannhetskontroll
National Category
Geotechnical Engineering
Identifiers
URN: urn:nbn:se:hig:diva-10480OAI: oai:DiVA.org:hig-10480DiVA: diva2:444023
Subject / course
Geomatics
Educational program
Geomatics – bachelor’s programme (swe or eng)
Uppsok
Technology
Supervisors
Examiners
Available from: 2011-09-28 Created: 2011-09-27 Last updated: 2011-09-28Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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