Results 51 to 60 of about 149,782 (195)

A Survey of Methods for Constructing 3D Urban Models From Point Clouds

Computer Graphics Forum, EarlyView.
The survey outlines a general process for constructing 3D models from point clouds and categorizes the methods based on their use of templates, basic surface primitives, hybrid approaches, or linear primitives. Additionally, the survey reviews the datasets and benchmarks that are essential for testing and training the developed methods.
Chiara Romanengo, Silvia Biasotti, Bianca Falcidieno, Daniela Cabiddu, Elia Moscoso Thompson, Michela Spagnuolo   +5 more
wiley   +1 more source

TreeON: Reconstructing 3D Tree Point Clouds from Orthophotos and Heightmaps

Computer Graphics Forum, EarlyView.
Abstract We present TreeON, a novel neural‐based framework for reconstructing detailed 3D tree point clouds from sparse top‐down geodata, using only a single orthophoto and its corresponding Digital Surface Model (DSM). Our method introduces a new training supervision strategy that combines both geometric supervision and a differentiable shadow and ...
Angeliki Grammatikaki, Johannes Eschner, Pedro Hermosilla, Oscar Argudo, Manuela Waldner   +4 more
wiley   +1 more source

MAFNet: A multi-modal adaptive fusion network-based approach for individual building extraction from oblique photogrammetry

International Journal of Applied Earth Observations and Geoinformation
Oblique photogrammetry is a pivotal technique for generating high-precision 3D urban models. However, the resulting models often exhibit a shell-like, surface-only structure, lacking both physical separation and semantic distinction between individual ...
Yi Xie, Junyang Chen, Jun Zhang, Yinfeng Hao, Yangke Ying, Xiangyang Yang, Yong Zhang, Yadi Wang   +7 more
doaj   +1 more source

High-Precision Monitoring during the Installation of Large Steel Structures by UAV Nap-of-the-Object Photogrammetry [PDF]

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
This paper proposes and validates a method based on UAV nap-of-the-object photogrammetry for refined 3D digital modeling to achieve high-precision monitoring during the installation of large steel structures, offering a comparative analysis with ...
C. Liu, S. Wei, M. Zhang, Q. Yan, F. Yu
doaj   +1 more source

A Quadrifocal Tensor SFM Photogrammetry Positioning and Calibration Technique for HOFS Aerial Sensors

Remote Sensing, 2022
Nowadays, the integration between photogrammetry and structure from motion (SFM) has become much closer, and many attempts have been made to combine the two approaches to realize the positioning, calibration, and 3D reconstruction of a large number of ...
Tao Wang, Yan Zhang, Yongsheng Zhang, Ying Yu, Lei Li, Shaocong Liu, Xiang Zhao, Zhenchao Zhang, Longhui Wang   +8 more
doaj   +1 more source

Research on quality Inspection method of Topographic Map using oblique Photogrammetry

IOP Conference Series: Earth and Environmental Science, 2021
Abstract In view of the shortcomings of traditional methods in the quality inspection of large-scale topographic maps in Alpine area and high altitude areas, such as the difficulty of operation and the limited coverage of detection points, this paper puts forward the method of UAV tilt photogrammetry.
Yatong Chen, Jianjun Cao
openaire   +1 more source

SINGLE TREE THREE-DIMENSIONAL MODEL CONSTRUCTION AND IMPACT FACTOR EXTRACTION BASED ON OBLIQUE PHOTOGRAMMETRY [PDF]

, 2019
Based on the digital photogrammetry principle and the computer vision theory, this paper utilizes Unmanned Aerial Vehicle (UAV) oblique photogrammetry technology to construct vegetation canopy structure three-dimensional model and to extract three ...
Li, Dongsheng, Xi, Wenfei, Zhao, Zilong
core   +1 more source

Oblique Aerial Images: Geometric Principles, Relationships and Definitions

Encyclopedia
Aerial images captured with the camera optical axis deliberately inclined with respect to the vertical are defined as oblique aerial images. Throughout the evolution of aerial photography, oblique aerial images have held a prominent place since its ...
Styliani Verykokou, Charalabos Ioannidis
doaj   +1 more source

Vertical Measurements in Oblique Aerial Imagery

ISPRS International Journal of Geo-Information, 2014
This article first introduces oblique aerial imagery, then describes how vertical distances can be measured once the pixel distances of the original pictures are known.
Massimiliano Molinari, Stefano Medda, Samir Villani   +2 more
doaj   +1 more source

Spatial and temporal scales in plant phenotyping for crop water stress assessment: A review

The Plant Phenome Journal, Volume 9, Issue 1, December 2026.
Abstract Water stress is a major limiting factor for crop productivity worldwide, and its impacts are intensifying due to climate variability and increasing water scarcity. This review focuses on the spatial and temporal scales in plant phenotyping as a critical approach to improving crop water‐stress assessment and supporting precision water ...
Daniel Kingsley Cudjoe, Yazhou Sun, Sanai Li, Wenxuan Guo   +3 more
wiley   +1 more source