Hanjin Information Systems &
Telecommunication Co., Ltd.
Hanjin Information Systems & Telecommunication
Co., Ltd. (HIST), a Korean manufacturer of aerial
laser-scanning systems, created a one-meter gridded digital elevation, one-meter contour line
ortho-mosaic image of the city of the EXPO
Science Park in the northern part of Daejeon City. It
took eight months to make the required 3D laser
scanning and ortho-mosaic images of Daejeon
City (540 square kilometers).
Most of the 3D modeling was done in a
MicroStation-based mapping environment. HIST
first separated bare ground (no buildings and
vegetation) and buildings within the aerially surveyed point-cloud data. The bare ground data
was processed to make the very detailed one-meter-by-one-meter gridded topography data.
Then HIST mapped the digital image inDescartes.
Aerial images taken with an aerial laser scanner
provided a good background view and was helpful in building shape detailing. This draped mosaic image of 50-centimeter resolution is a part of the
image. The use of ground elevation data and aerial
images makes the image appear more realistic. ;
3D documentation of a High-Voltage Substation
GEOSPATIAL MODELING
imp GmbH
The firm used MicroStation to texture each of the
virtual components with photographs of the real-world components, resulting in a 3D model presented as a virtual-reality environment, a 3D PDF
file, and an animation.
Germany-based imp GmbH has been using laser-scanning technology the past four years for the
documentation and planning of overhead transmission lines and substations. In addition to the
traditional way of documentation (top view and
cross sections), the firm has developed a 3D
model out of the 3D laser scanning point cloud.
The major challenge of this pilot project was to
show the possibilities of virtual reality 3D models
as a form of combined documentation.
In constructing 3D models, the firm uses
MicroStation as the underlying 3D modeling software, along with external applications and custom MDL applications. In some workflows, about
three-quarters of the work is done through automated routines. ;
One aspect of this project was to develop a 3D
component library by enhancing an existing 2D
cell library combined with the 3D laser data. The
required accuracy of the model had to be one to
two centimeters.
