3D Laser Scanning Survey Provider in London UK

The fast-moving pace of  building survey technology means there’s always something new, better, faster, more efficient. A step-change in the surveying industry is happening right now. The emergence of the 3D  laser scanning surveys in recent years offers us massively improved detailing and accuracy in our measured building surveys and with hugely reduced survey times. That is why Callidus has invested heavily in the most modern 3D laser scanning equipment and software to stay on top of the surveying industry. Callidus is committed to producing the most accurate building and laser scanning survey in London and across UK. The laser scanner, right now, is unquestionably the way to fulfil that commitment.

3D laser scanning allows us to capture hundreds-of-thousands of coordinated points per second that describe a building with high accuracy in 3D. This ‘point-cloud’ data-set can be manipulated and sliced at will to form the foundation of the drawings you want to see. Plans, elevations, sections – all drawn from high-density, spacially accurate data.

Below are some of the other specific areas of Callidus expertise. Click on the links to see how we could be helping your next project:

Laser scanning is the modern method of spatial data collection on a site. Current laser scanning equipment is capable of measuring and recording millions of discrete data points within its field of ‘vision’ which build up a point-cloud depicting the buildings/structures you are looking to capture. Each point comes with elements of data including X,Y & Z coordinates (relative to the scanner location), reflective intensity (giving an indication of the type of surface of the scanned element) and colour (when combined with colourisation functionality). Each scanning project will contain a number of point clouds collected from individual scanner locations. The individual point clouds are stitched (registered) together to produce one homogenous point cloud, creating a full, spatially-accurate 3D depiction of the surveyed entity.

Sadly, there is not yet a button we can press to create 2D or 3D drawings from point-cloud data!

Once the point clouds have been registered and placed in their correct location in digital space (often using GPS references taken on site), they can be inserted into CAD software. The point clouds can be sliced into manageable portions (for example, a thin, horizontal section at 1.5m above finished floor level). Lines are then drawn in CAD to accord with point data. Each ‘slice’ of data can be created to produce plans (horizontal slice), cross sections and elevations (vertical slices).
Not only can the point clouds depict walls, windows and doors, the data is sufficiently detailed to be able to clearly see any internal and/or external elements of detail in high resolution. Architectural mouldings, power sockets, exposed wires, individual bricks etc. can all be picked out in fine detail and drawn accordingly.

There are many reasons why laser scanning has become the go-to method of data capture in modern building surveys. Some of the main benefits are listed below:
– Very fast data collection – vast quantities of information can be captured in just a couple of minutes.
– Survey elements captured in fine detail.
– Non-contact – we do not need physical access to an element of detail to be able to measure it.
– Hazardous environments can be measured while keeping personnel at a safe distance.

The two main settings on a laser scanner are resolution and quality. The resolution refers to the density of point spacings within a scan. These can be likened to DPI (dots per inch) on a printer. The quality refers to how accurate the distance taken to each point is. Higher quality requires multiple verifications for each point’s distance. Between high- and low-quality settings we are looking at the scan ‘noise’ difference (on a flat surface) of roughly +/-3mm and +/-7mm at internal scales.
A high quality, high resolution scan could take over an hour. For most survey purposes we can use quality and resolution settings that will give us scans of between 2 and 5 minutes each. These are dense and accurate enough to be able to detail an architectural moulding with good precision at close range (below 5m).
As a guide to the Callidus methodology, a typical 4-5 bedroom London dwelling can be scanned with up to 100No. scans. This would take-in all typical internal detail over 4 floors (including loft), all external elevations and the extents and detail of an average sized garden. We would expect to complete this in 5-7 hours. This will provide a comprehensive point cloud which we can translate in to a high-calibre survey. Time reductions can be made on site by reducing the resolution, quality and/or number of scans, but the detail and/or accuracy of the final drawn product will be reflected.