Različni pristopi k izdelavi popolnega ortofota

Abstract

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Language:	Slovenian
Year of publishing:	2008
Source:	Ljubljana
Typology:	2.11 - Undergraduate Thesis
Organization:	UL FGG - Faculty of Civil and Geodetic Engineering
Publisher:	[J. Hartman]
UDC:	528.7(043.2)
COBISS:	3964257
Views:	2234
Downloads:	528
Average score:	0 (0 votes)
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Secondary language:	English
Secondary title:	Different approaches to creating true orthophoto
Secondary abstract:	In the first, theoretical part of my diploma thesis main topic is presentation of different approaches to executing individual phases in procedure of creating true orthophotos. Firstly I explain main idea of (classical) orthophotos and its disadvatages, which caused the need of true orthophotos. I divide the whole procedure into seven steps: acquiring data for 3D model, 3D modelling, acquiring photographs, orto rectification, locating obscured areas, colour matching and mosaicking with feathering. In step of acquiring data for 3D model I explain acquisition with laser scanner and with image matching in greater detail. Both methods allow quick acquisition of great amount of points and are therefore very convenient for creating digital surface model (DSM). 3D modelling chapter amongst others introduces hybrid model, which is combination of triangular irregular network - TIN (accuracy) and grid (simple data structure). Five methods for obscured areas detection are presented: Z-buffer method, polygon based method, triangle based method, angle based method and height based method. In mosaicking phase three criteria for choosing homologous pixels (from overlaying orthophotos) are presented: distance to nadir, distance to obscured areas and angle between projetion ray and DSM. The main aim of practical part of diploma thesis was to create a true orhophoto of a simple object. I chose a section of façade of residential block with two balconies. DSM is described with five rectangules in 3D space. I chose angle method for obscured area detection and distance to nadir criterion for mosaicking. Colour matching and feathering were not applied.
Secondary keywords:	geodesy;graduation thesis;true orthophoto;digital surface model;obscured (occluded) areas;mosaicking;
File type:	application/pdf
Type (COBISS):	Undergraduate thesis
Thesis comment:	Univ. v Ljubljani, Fak. za gradbeništvo in geodezijo
Pages:	XII, 62 str., pril.
Type (ePrints):	thesis
Title (ePrints):	Različni pristopi k izdelavi popolnega ortofota
Keywords (ePrints):	geodezija;diplomska dela;UNI;popolni ortofoto;digitalni model površine;zakrita območja;mozaičenje;
Keywords (ePrints, secondary language):	geodesy;graduation thesis;true orthophoto;digital surface model;obscured (occluded) areas;mosaicking;
Keywords (ePrints, secondary language):	geodesy;graduation thesis;true orthophoto;digital surface model;obscured (occluded) areas;mosaicking;
ID:	8310711