Laser Scanning

Laser scanning is a method of accurately capturing 3 dimensional as-built data of large areas. The technology has been around for a few years now but its only within the last couple of years that clarity and accuracies are now so advanced that it can be adapted to the oil and gas industry. The Laser Scanner scans the required area at a speed of 120,000 points per second to produce what we call a “point cloud”.

A point cloud is a 3D representation of the area consisting of many millions of points each with x,y,z coordinates which are related back to the local coordinate system. This allows us to establish a coordinate value for any existing point within the area.

Part of the process is to set out a master control system of targets throughout the area to be scanned as multiple instrument set-ups are necessary to ensure a full 3D capture. Each target has a coordinate value based on the establish coordinate system and this allows us to bring all individual set-ups into a common system.


 

Objectives

  • Method of accurately capturing 3 dimensional as-built data of large areas.
  • Innovative capture and modelling of existing building conditions.

Applications

  • Historical building documentation
  • Facility condition visualization
  • Physical deviation assessment
  • Building Information Model (BIM) development
 

Advantages

The fastest scanners record up to one million data points per second. "Virtual Surveying" from the resulting point cloud is often much faster and more economical than conventional field measuring and surveying techniques.

Since millions of points are collected, statistical "best fit" positions and dimensions can be computed to locate features and determine feature sizes and shapes with very high accuracy - typically 2mm-4mm for each individual measurement point.
Three-dimensional coordinates (x,y,z or Northing, Easting & Elevation) are captured from all exposed surfaces within the scanner's range and field of view at a high level of detail, including poorly illuminated areas. Laser scanners can operate in total darkness or bright sunlight.
Laser scanners are non-contact measurement tools that can "see" up to 300 yards. Work interruptions or facility downtime to accommodate surveying is virtually eliminated.
Entering roadways, working from elevated positions or near hazards is largely eliminated. Scanner positions are typically located safely on the ground and in non-hazardous areas. True Point utilizes Class 1 Laser Scanners which means that the scanners are also eye safe. This is imperative for active sites so that areas do not need to be quarantined off during the scanning.
Scan data and derivative models can be re-used for later unanticipated inquiries, or even totally new projects. Return trips to the site are minimized or eliminated.
Laser scanning can support land surveying, 3-D modeling, Facility Information Management, Building Information Modeling (BIM), forensics, and much more.

Appendices