Professional Surveying Services

3D laser scanning

3D laser scanning captures spatial data by the use of laser light. The shape, position and spatial locations of objects are recorded by millions of points. The scanner’s ability to see everything in its line of sight and create a point cloud (a set of vertices in a 3D coordinate system, defined by X, Y, Z coordinates) has revolutionized spatial data collection.

Laser scanners

Laser scanners send up to a million laser beams a second out from a mirror that rotates vertically at high speed; the main body of the scanner slowly rotates horizontally at the same time to obtain a full 360 degree scan of everything surrounding the scanner up to 120m way. The result is a "point cloud" with millions of points depicting the surveyed building and its surrounds in minute detail.

How we doing it?

• Agree on specification for laser scan and completed BIM model, including level of detail and scope of work
• Establish accurate quality checked control network
• 3D laser scan internally and externally
• Register scan clouds together and quality check accuracy
• Use quality checked point cloud to create the 3D intelligent BIM model using Autodesk Revit
• Create a range of deliverables from the completed BIM model
• Archive and maintain the BIM model and scan cloud for future additions or later project phases

Traditional surveying comparing with cutting edge technology

When we are surveying with traditional total station surveying methods we are actually measuring specified points on key features. Using this coordinates in Auto Cad we are designing DWG and latter on importing into REVIT and building our BIM. models from there.

Laser Scanners measure millions of points per second , millions of points across whole building/structure surfaces. Laser Scanner they just get everything, while total station measure what you want.

Sometimes it's quicker to use the old methods, rather than the laser scanner, the great advantage of scanning is its speed on site. You collect absolutely everything very quickly. While there will be blind spots as laser scanners work on line-of-sight you get most things.

UPG Surveying has the capability and resources to provide a comprehensive and accurate Topographical Survey of your works area to a level of detail that meets with your specifications.

Our Topographical survey will provide you with a detailed picture of a specified land take. All features are surveyed to a high level of detail and accuracy, drawn to a specified layer coding system.

Final survey drawings can be supplied as hard copies and the captured digital information can be provided in either 2D or 3D in file formats such as DWG, DXF, DWF, and PDF.

UPG Surveying utilise two key detection techniques in the location of underground services. The initial approach will incorporate electronic detection of underground services using the principle of electromagnetism. This technique works on the basis that a current flowing along the conductor creates a magnetic field. When a receiver is swept across the field it will detect the signal. In principle the centre line of the buried service is where the response from the field is shown at its maximum strength on the receiver. This technique makes use of both active and passive radiated energy to detect buried services. An active signal is one that has been artificially generated by the transmitter by either direct connection or induction. A passive signal relates to the naturally transmitted signal on a buried conductor and is detected by observing the 50Hz energy or reradiated VLF radio energy present.

The main disadvantage of electromagnetic location is its inability to locate non-metallic services. In this instance we would introduce ground penetrating radar (GPR) techniques to enhance overall coverage of the survey information.

When all underground services have been identified & marked on the ground, depending on the clients specification, a GPS survey may be completed, recording positioning points ready for data transfer. The data received will be overlaid onto a topographic base plan & imported in to AutoCAD format.

• ground level
• interior photos
• manhole opening size
• depth of invert
• depth of chamber
• crown level
• incoming -outgoing pipes