What to think about regarding different methods when hiring a construction surveyor

Posted on: 4 November 2015

Construction surveyors use a variety of different methods to survey a construction site or a building. One of the newer methods of surveying is to use a 3D laser scanner. If you're going to hire a construction surveyor to survey your project, it might be good to know what hiring a surveyor using a 3D laser scanner means. Comparing it to other commonly used methods might give you an idea how the surveying of your project is conducted and why hiring a surveyor using 3D scanning methods might be an advantage to your project.

Direct survey with a portable laser

One other common way of conducting surveys is direct survey with a portable laser. This is the least complicated method of surveying, as it is done by hand with a laser measuring tool. It's done by measuring thickness of walls and spaces between structures. It's however only appropriate for small spaces, as it isn't very accurate without multiple measurements of all similar structures in a building. That means it can also take some time to finish.

Surveying with total station integrated with direct survey

Another type on surveying is surveying with total station integrated with direct survey. This type of survey is conducted in two steps, a topographic survey and a direct survey. The first thing that is done is surveying of the different structures using a total station, which brings highly precise results. Then the topographic survey is conducted by linking the geographical properties of the site with the structures. With a good total station this method can be very effective, but the survey isn't very detailed as the survey is rather general when it comes to details. It suffers from the same downsides as the direct survey with a portable laser, as the surveyor will have to measure data by hand multiple times to acquire correct results.

3D laser scanning

Surveying with a 3D laser scanner is highly detailed even when surveying large structures. It can do this by gathering clouds of information regarding areas the surveyor has programmed beforehand. It then compares these clouds to each other to work out relationships between different areas of information. The hardware obtains only geometric information of the area or object being scanned. If you're interested in colours or other visual elements of the surveyed area, many 3D laser scanners come with a built in camera. This method is also a lot faster than the other types of surveying. It's brings back more detailed data, making it implausible that the surveyor needs to come back to do more readings or double check the acquired data. There is no need to do a direct survey, so the surveyor won't have to physically touch any of the measured structures, which makes it functional also in unreachable locations. 

Contact a local professional, such as Transit Technical Services, for more information.