About laser scanning
Posted: Mon Dec 23, 2024 4:44 am
Having presented his topic, Alexander Korzhov, BIM coordinator at Infrastroyproekt with an education in applied geodesy, admitted that point cloud modeling for facades and other elements is not really that different.
Content
About laser scanning
About photogrammetry
What is a point cloud?
On creating facade models from point clouds
What's the bottom line?
But before he elaborated on his views, he decided to tell the attendees of the March BIM breakfast how phone number in uae a point cloud can be obtained, the pros and cons of each approach, and what problems can be encountered when creating a 3D model based on this data.
Play: Video
"Laser scanning is an indirect way of measuring the distance from the laser beam source point to another surface. If you know the coordinates of the radiation source point, then using a direct geodetic problem you can determine the coordinates of the point on the surface of the object," explained Alexander Korzhov.
Among the types of scanning work, he identified two categories:
Airborne laser scanning (ALS)
When using VLS, you can cover a large area, which is ideal for inspecting linear and area objects. And as a radiation source, you can use not only UAVs, but even airplanes and helicopters. The disadvantages of this approach are its high cost and the increased fragility of cheaper radiation source carriers.
Terrestrial laser scanning (TLS)
NLS is great for working both outside and inside the building. The scanning equipment is quite compact and can sometimes be transported directly in the operator's hands. And to start scanning, you only need to have access to the surface being scanned. Among the disadvantages of NLS: the need to purchase additional scanners and auxiliary devices when measuring large and tall buildings, as well as sometimes excessive detailing of objects compared to classic surveying with an electronic tachymeter.
Alexander Korzhov emphasized that, in his opinion, ground-based laser scanning is superior to aerial scanning, since the safety of scanners in ground-based laser scanning is much higher, unlike aerial scanning, during which the UAV can collide with a bird or fly away in an unknown direction.
Content
About laser scanning
About photogrammetry
What is a point cloud?
On creating facade models from point clouds
What's the bottom line?
But before he elaborated on his views, he decided to tell the attendees of the March BIM breakfast how phone number in uae a point cloud can be obtained, the pros and cons of each approach, and what problems can be encountered when creating a 3D model based on this data.
Play: Video
"Laser scanning is an indirect way of measuring the distance from the laser beam source point to another surface. If you know the coordinates of the radiation source point, then using a direct geodetic problem you can determine the coordinates of the point on the surface of the object," explained Alexander Korzhov.
Among the types of scanning work, he identified two categories:
Airborne laser scanning (ALS)
When using VLS, you can cover a large area, which is ideal for inspecting linear and area objects. And as a radiation source, you can use not only UAVs, but even airplanes and helicopters. The disadvantages of this approach are its high cost and the increased fragility of cheaper radiation source carriers.
Terrestrial laser scanning (TLS)
NLS is great for working both outside and inside the building. The scanning equipment is quite compact and can sometimes be transported directly in the operator's hands. And to start scanning, you only need to have access to the surface being scanned. Among the disadvantages of NLS: the need to purchase additional scanners and auxiliary devices when measuring large and tall buildings, as well as sometimes excessive detailing of objects compared to classic surveying with an electronic tachymeter.
Alexander Korzhov emphasized that, in his opinion, ground-based laser scanning is superior to aerial scanning, since the safety of scanners in ground-based laser scanning is much higher, unlike aerial scanning, during which the UAV can collide with a bird or fly away in an unknown direction.