|
|
 |
|
Spatial Resources E-Newsletter investigates spatial technologies to provide objective,
independent information tailored specifically to your spatial information needs. Read past issues:
|
|
Aerial LIDAR Provides Fast, Economical, High-Accuracy,
Digital Terrain Models (11-1-2004):
A reliable source of accurate, 3-D digital elevation data at a fraction
of traditional mapping costs has been met by LIDAR with accuracies of better than 6 inches.
|
|
What is Terrestrial Laser Scanning?
(11-18-2004) This issue focuses
on terrestrial laser scanning, a technology that creates accurate three-dimensional images of real-world objects and existing
conditions. A laser scanner records millions of highly accurate, unique points by sweeping its beam over a surrounding scene
or object. The scanners X,Y,Z measurements are recorded and displayed as a "point cloud" which can be viewed, measured
and navigated as a 3D model providing incredible insight to the scene.
|
|
This issue provides an overview of rapid prototyping
technology to create physical 3D scale-models. (11-25-2004) The building of scale models as a fundamental planning, design and communication tool is well ensconced
in the architecture industry. Other than architecture and the military, scale-model building has not been exploited by many
applications. However, with technologies such as laser
scanning, LIDAR, close range photogrammetry, and 3D computer modeling capabilities, many of the data capture and creation
issues have been addressed and rapid prototyping technology provides the solution to the laborious task of producing physical
scale models.
Airborne
LIDAR Surveys Electric Transmission Lines (2-3-2005):
Airborne Lidar is now a well proven technology for providing
accurate elevation models for transmission lines, allowing utilities to measure the shape of the ground below the transmission
line, the position of the towers and poles, the sag on the wires, and the up-growth of any vegetation incursions or other
possibly illegal incursions into the right of way. |
|
Terrestrial Laser Scanning Benefits Mining
(2-8-2005): In the real world of volume calculations, there are small changes on surface angles due to slumping of material
and other factors. Because Laser scanning collects so many points, these measurements are recorded and translated to the final
model. In a recent quarry test, manual readings from the stockpile toe and crest took four hours to collect 400 survey points.
In comparison, laser scanning captured more than 1.2 million coordinated survey points in one hour. Operator safety was enhanced
with Laser scanning because it was not necessary to physically access the stockpile.
|
|
LIDAR Surveys for
Pipelines and Exploration (2-15-2005): Petroleum and utility companies need precise knowledge of the topography when planning
the construction of pipelines, utility routes or the mapping of broad area exploration sites. Accurate terrain measurements
are critical to assess the feasibility of construction in a wide variety of terrains. Close-Range Photogrammetry Creates Accurate As-Built Survey of Cell Tower Antennas Close-Range Photogrammetry is an accurate, cost effective technique of
collecting measurements of real world objects and conditions, directly from photographs. Photogrammetry utilizes digital images
to obtain accurate measurements and geometric data of the object or area of interest, in order to provide spatial information
for engineering design, spatial surveys or 3D modeling. The benefits of close-range photogrammetry over other field procedures
are purported to be: Increased accuracy; complete as-built information; reduced costs; reduced on-site time; and effective
for small and large projects.The Art of LIDAR Feature Extraction Becomes Smooth as SILC.
Within the
last year or so, there has been a trend among a handful of aerial LIDAR service providers to commoditize the acquisition and
processing of LIDAR data. Unfortunately for the customers, and the industry in general, nothing could be further from the
truth.
click here to download SILC article in PDF format...
Multi-Sensor Data Fusion Provides the Means to Extract True Value From Remote Sensing Data
Current developments in the integration of multiple digital data sets such as hyperspectral imaging, color digital orthophotos
and airborne Lidar data are generating 3-D geospatial information that, previously,
has been unattainable.
The fusion of geospatial data from different sources allows the creation of thematic data layers and
structural features for urban and natural environments that can be critical elements of a geospatial database. These elements
include: building footprints, height and structural characteristics; feature composition and material maps; vegetation type,
height and density; and, natural and cultural land-use and cover information, providing a powerful toolkit to enable intelligent
data analysis.
click here to download sensor fusion article as PDF file ...
LIDAR
Provides Highly Acuracy Land Surface Elevations for Seismic Surveys
On seismic projects, the use of LIDAR
can result in extensive operational cost savings and improvements in data quality. In many environments, LIDAR can make a
significant contribution toward conducting a successful seismic program.
click here to download article as PDF file...
Click here to go to more newsletter articles...
Spatial Resources, LLC, PO Box 3623, Centennial, CO 80161; Phone: 720-934-2482; Fax: 303-721-9042
|
|
|
|
