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Quality comparison of automatic3D city house modelling methodsfrom laser data
KTH, School of Architecture and the Built Environment (ABE), Transport and Economics (closed 20110301), Geodesy (closed 20110301).
2007 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Today there are different methods to automatically generate 3D models from laser data, whichgive varying results. The two methods used in this study are, a fully automatic methoddeveloped by the Swedish Defence Research Agency, FOI, and a semiautomatic methodwithin the program Terra Scan which is developed by Terrasolid, a Finnish company.The report describes the way these methods have been implemented, and it evaluates theoutput quality of each model set created from specified criteria.In order to be able to verify the quality, a statistical model was created with the purpose ofusing it for other situations as well in the future.The modelling methods gave different results and both had their strengths and theirweaknesses, which makes them applicable for different tasks. The strength in FOI’s method isthat it could recreate even more advanced buildings and still get a good visual impression, e.g.Stockholm’s central station.One advantage with the method used in Terra Scan is that it has good capabilities and tools toedit the models, which makes it possible to vary the quality depending on the purpose.In order to generate the best result this method is not supposed to be used in an automaticway.

Abstract [sv]

Idag finns många metoder för att automatiskt generera 3D husmodeller, med varieranderesultat. Dels har försvarets forsknings institution, FOI, utformat en helautomatisk metod förgenerering av husmodeller och dels har det Finska bolaget Terrasolid en metod i sinprogramvara Terra Scan för att rekonstruera byggnadsmodeller.Denna rapport bygger på utvärdering av dessa två metoders modelleringsförfaranden, därmetodernas utformning gås igenom och kvaliteten kontrolleras. För att kunna kontrollerakvaliteten hos modellerna byggs en statistisk modell upp som har för avseende att kunnaanvändas vid framtida bruk som ett verktyg för kvalitets kontroll.Kvaliteten hos de båda metoderna gav varierande resultat och båda metoderna hade sinastyrkor och svagheter, vilket gör dem användbara för olika situationer. En styrka i FOI’smetod var att den kunde modellera även mer komplexa byggnader med svårare utformning, såsom Stockholms Centralstation.Positivt med metoden i Terra Scans är att det finns bra editerings verktyg så att kvaliteten kanvarieras enkelt beroende på krav men på bekostnad av en tids parameter. För att få ut de bästaresultaten med denna metod krävs manuell editering.

Place, publisher, year, edition, pages
2007.
Series
TRITA-GIT EX ; 07-08
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-199834OAI: oai:DiVA.org:kth-199834DiVA, id: diva2:1065451
Supervisors
Available from: 2017-01-19 Created: 2017-01-16 Last updated: 2017-01-19Bibliographically approved

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Type fulltextMimetype application/pdf

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Geodesy (closed 20110301)
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