Rekonstrukcija zgradb in goratih predelov v oblakih točk LiDAR

Slemenik, Matej (author), Marolt, Matija (mentor), Bohak, Ciril (comentor)

Z razvojem tehnologije LiDAR je postala izdelava natančnih 3D modelov mest in zemeljskega površja bistveno lažja kot v preteklosti. Kljub temu, da so podatki, ki nastanejo s pomočjo laserskega skeniranja sistemov LiDAR zelo natančni in fleksibilni, pa imajo tudi nekatere pomanjkljivosti. Površinam objektov, ki jih ni mogoče zaznati iz zraka, manjkajo nekateri podatki - točke, ki se v rekonstrukciji objektov vidijo kot luknje. V magistrskem delu podajamo rešitev, s katero je mogoče zaznati in zapolniti luknje v stenah zgradb ter površju goratih predelov. Luknje se zapolnijo tako, da se obstoječemu modelu oblaka točk doda nove točke na ustrezna mesta. Pri dodajanju novih točk v stene zgradb si pomagamo s topografskimi podatki, kjer lahko določamo robne koordinate tlorisa zgradb, kar določa mejo dodanih točk. Dodajanje novih točk v gorate predele naredimo s poenostavitvijo obstoječega modela točk tako, da naredimo različne pravokotne projekcije na ravnino. V 2D prostoru nato poiščemo lokacije koordinat območij lukenj, višino pa jim določimo s pomočjo interpolacije sosednjih točk.

• Language: Slovenian
• Keywords: računalniška grafika, 3D oblaki točk, LiDAR, rekonstrukcija objektov, datoteka LAS
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: FRI - Faculty of Computer and Information Science
• Year: 2020
• PID: 20.500.12556/RUL-114505
• COBISS.SI-ID: 1538545347
• Publication date in RUL: 03.03.2020

SLEMENIK, Matej, 2020, Rekonstrukcija zgradb in goratih predelov v oblakih točk LiDAR [online]. Master’s thesis. [Accessed 31 March 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=114505

Secondary language

• Language: English
• Title: Reconstruction of buildings and mountainous areas in LiDAR point clouds

Abstract

Accurate 3D model reconstruction of cities and Earth's surface has become increasingly more accessable and undemanding due to the development of LiDAR technology. Even though the data colleted from LiDAR scanning systems is very accurate, precise and flexible, it has its shortcomings. Areas of objects that are impossible to scan from airborne sensors contain missing point data, which are regared as holes in the proccess of object reconstruction. In this thesis we propose an algorithm for detection and filling missing points in models of building walls and mountainous surface areas. Our solution assumes filling empty spaces of point clouds with newly created points. Adding new points to building walls is made based on topographical data, that is used for determining building borders and coordinates for point insertion. Adding new points to mountainous surface areas is made possible with the help of a simplified point model, that is constructed with plane projection. After determining coordinates of new points on a plane, we calculate point heights based on interpolation of neighbouring points.

• Keywords: computer graphics, 3D point clouds, LiDAR, object reconstruction, LAS file