Wyniki wyszukiwania dla: point%20cloud

• Point cloud unification with optimization algorithm

  Publikacja

  • W. Błaszczak-bąk
  • A. Sobieraj-Żłobińska

  - Technical Sciences / University of Warmia and Mazury in Olsztyn - Rok 2015

  Terrestrial laser scanning is a technology that enables to obtain three-dimensional data – an accurate representation of reality. During scanning not only desired objects are measured, but also a lot of additional elements. Therefore, unnecessary data is being removed, what has an impact on efficiency of point cloud processing. It can happen while single point clouds are displayed – user decides what he wants...

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• Point cloud in archaeological and historical survey

  Publikacja

  • B. Wieczorek
  • A. Sobieraj-Żłobińska
  • A. Tryzna

  - Rok 2017

  In the last decade the potential of using the point clouds in archaeological research has been noted. Therefore, a number of guidelines concerning aspects of data acquisition (resolution and format) were developed. They also included the way of searching the imaged area to identify archaeological and historical cultural heritage sites. The purpose of this research was to analyze the point cloud for selected woodland survey. Forest...

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• Impact of optimization of ALS point cloud on classification

  Publikacja

  • W. Błaszczak-Bąk
  • A. Sobieraj-Żłobińska

  - Technical Sciences / University of Warmia and Mazury in Olsztyn - Rok 2013

  Airborne laser scanning (ALS) is one of the LIDAR technologies (Light Detection and Ranging). It provides information about the terrain in form of a point cloud. During measurement is acquired: spatial data (object’s coordinates X, Y, Z) and collateral data such as intensity of reflected signal. The obtained point cloud is typically applied for generating a digital terrain model (DTM) and a digital surface model (DSM). For DTM...

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• Proposition of aerial laser survey point cloud methodology modification

  Publikacja

  • W. Błaszczak-Bąk
  • A. Janowski
  • W. Kamiński
  • J. Rapiński

  - Rok 2010

  W rozdziale monografii autorzy sugerują nowe rozwiązanie - modyfikację metodologii analizy chmury punktów pozyskanej ze skaningu lotniczego w technologii LIDAR. Modyfikacja polega na poprzedzeniu procesu filtracji realizowanego w ETAPIE PRZETWARZANIA WSTĘPNEGO, algorytmem optymalizacji [Błaszczak 2006, Błaszczak, Kamiński 2007]. Głównym celem badań była kontrola wiarygodności i efektywności metodologii opracowania chmury punktów...

• Reconstruction Methods for 3D Underwater Objects Using Point Cloud Data

  Publikacja

  • M. Kulawiak
  • Z. Łubniewski

  - HYDROACOUSTICS - Rok 2015

  Existing methods for visualizing underwater objects in three dimensions are usually based on displaying the imaged objects either as unorganised point sets or in the form of edges connecting the points in a trivial way. To allow the researcher to recognise more details and characteristic features of an investigated object, the visualization quality may be improved by transforming the unordered point clouds into higher order structures....

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• From a Point Cloud to a 3D Model - an Exercise for Users of AutoCAD and Revit

  Publikacja

  • B. Kotarska-Lewandowska

  - The Journal of Polish Society for Geometry and Engineering Graphics - Rok 2017

  The paper presents a proposal of the topic of an exercise for students of building faculties as part of classes on 3D modelling. The task consists in creating a three-dimensional model based on the measurement obtained with the Leica P30 laser scanner. Due to the maximum number of points in the cloud in the presented programs, the output files must be properly cleared and reduced. The point cloud was pre-processed in Cyclone software....

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• 3D POINT-CLOUD SPATIAL EXPANSION BY TOTAL LEAST-SQUARES LINE FITTING

  Publikacja

  • P. S. Dąbrowski
  • M. Zienkiewicz

  - PHOTOGRAMMETRIC RECORD - Rok 2020

  Point-cloud spatial expansion (PCSE) allows the creation of a new pointcloud form that presents an alternative geometry of an entire object in a single spatial view. Spatial expansion facilitates the analysis process and introduces an additional spatial parameter describing the point cloud. An important element of the PCSE method is determining the position of the axis of symmetry of a symmetrical object: the procedure for determining...

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• Assessing historical church tower asymmetry using point cloud spatial expansion

  Publikacja

  • P. S. Dąbrowski
  • M. Zienkiewicz
  • L. Truong-hong
  • R. Lindenbergh

  - Journal of Building Engineering - Rok 2023

  Church towers are key cultural heritage. In theory, towers are vertical, while facade elements are symmetrically positioned around the tower axis. However, during service of a structure, building and lifetime conditions cause deviations, with associated risks. Laser scanning point clouds can be used to assess the structural state but a universal approach was missing. The proposed algorithm first estimates the tower inclination,...

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• 3d point-cloud spatial expansion by total least-squares line fitting

  Publikacja

  • P. S. Dąbrowski
  • M. Zienkiewicz

  - PHOTOGRAMMETRIC RECORD - Rok 2020

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• Assessing historical church tower asymmetry using point cloud spatial expansion

  Publikacja

  • P. S. Dąbrowski
  • M. Zienkiewicz
  • L. Truong-Hong
  • R. Lindenbergh

  - Journal of Building Engineering - Rok 2023

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