Zoom Logo

NHERI Lehigh Seminar Series - Shared screen with speaker view
Lehigh University
12:27
Welcome to today's NHERI Lehigh Seminar Series continuing with Dr. Yelda Turkan's presentation. We will begin shortly after 4pm EST. Please hold all questions to the end of the presentation. You may write your question in chat or raise your hand or unmute yourself at that time. If there are any technical issues, please use the chat window. Thank you.
Yanlin Guo
32:23
How much computational time does it take to build 1) 3D point cloud and 2) photo realistic model using LiDAR?
Brett Baker
33:38
I am guessing it depends on the software. There are automated cloud based systems associated with drone vendors that do it automatically.
Farid Javadnejad
42:00
Yanlin, you may consider the following factors:- Data collection (depends on the equipment performance and the size of AOI).- Point cloud registration and creating unified point cloud (depends on data size, i.e., number of points and processing speed).- Generating 3D mesh or CAD models (level of automation and processing speed)- Generating BIM by adding metadata (level of automation).
Brett Baker
45:01
Does the BIM model equate with as-built information? I am wondering if there is a difference if that affects the results?
Brett Baker
45:55
Have you used drones for rapid post EQ damage analysis and if so what is your opinion it as a recon method?
Yanlin Guo
46:08
Thanks!
Yanlin Guo
47:02
Do you convert BIM model to structural model for analysis?
Yanlin Guo
47:40
Thanks!
Brett Baker
48:15
Thx!
Ebrahim
48:18
How do you measure deformation in point clouds, is it based on change detection?
Anna
49:41
Ebrahim -- typically, the point clouds are "meshed" together to form a plane. Point normals are then assessed at each point to determine deformation in the plane.
Brett Baker
50:19
I thought BIM were created before construction and used in construction, thus my confusion with post construction as-built.
Ebrahim
51:12
Anna, thanks.