Blar i NTNU Open på forfatter "Kong, Gefei"
-
Automatic building outline extraction from ALS point cloud data using generative adversarial network
Kong, Gefei; Fan, Hongchao; Lobaccaro, Gabriele (Peer reviewed; Journal article, 2022)The generation of building footprints from laser scanning point clouds or remote sensing images involves three steps: segmentation, outline extraction and boundary regularization/generalization. Currently, existing approaches ... -
Detecting vertices of building roofs from ALS point cloud data
Kong, Gefei; Zhao, Yi; Fan, Hongchao (Peer reviewed; Journal article, 2023)Roof vertex information is vital for 3D roof structures. Reconstructing 3D roof structures from point cloud data using traditional methods remains a challenge because their extracted roof vertices are affected by uncertainty ... -
Future Swedish 3D City Models—Specifications, Test Data, and Evaluation
Uggla, Maria; Olsson, Perola; Abdi, Barzan; Axelsson, Björn; Calvert, Matthew; Christensen, Ulrika; Gardevärn, Daniel; Hirsch, Gabriel; Jeansson, Eric; Kadric, Zuhret; Lord, Jonas; Loreman, Axel; Persson, Andreas; Setterby, Ola; Sjöberger, Maria; Stewart, Paul; Rudenå, Andreas; Ahlström, Andreas; Bauner, Mikael; Hartman, Kendall; Pantazatou, Karolina; Liu, Wenjing; Fan, Hongchao; Kong, Gefei; Liu, Hang; Harrie, Lars (Peer reviewed; Journal article, 2023)Three-dimensional city models are increasingly being used for analyses and simulations. To enable such applications, it is necessary to standardise semantically richer city models and, in some cases, to connect the models ... -
An Interactive platform for low-cost 3D building modeling from VGI data using convolutional neural network
Fan, Hongchao; Kong, Gefei; Zhang, Chaoquan (Journal article, 2021)The applications of 3D building models are limited as producing them requires massive labor and time costs as well as expensive devices. In this paper, we aim to propose a novel and web-based interactive platform, VGI3D, ... -
PH-shape: an adaptive persistent homology-based approach for building outline extraction from ALS point cloud data
Kong, Gefei; Fan, Hongchao (Peer reviewed; Journal article, 2023)Building outline extraction from segmented point clouds is a critical step of building footprint generation. Existing methods for this task are often based on the convex hull and α-shape algorithm. There are also some ... -
Solar energy digitalization at high latitudes: A model chain combining solar irradiation models, a LiDAR scanner, and high-detail 3D building model
Manni, Mattia; Nocente, Alessandro; Kong, Gefei; Skeie, Kristian Stenerud; Fan, Hongchao; Lobaccaro, Gabriele (Peer reviewed; Journal article, 2022)Solar mapping can contribute to exploiting more efficiently the solar energy potential in cities. Solar maps and 3D solar cadasters consist of visualization tools for solar irradiation analysis on urban surfaces (i.e., ...