NCTech iSTAR camera and the Topcon GLS-2000

NCTech iSTAR camera and the Topcon GLS-2000

One of the limitations of many terrestrial laser scanners is acquiring onboard photography that is representative of reality. This can be quite challenging and/or time consuming to achieve well – the main reasons are low resolution, poor exposure due to difficulties in obtaining accurate settings for a 360 degree scan, and the high chance of external noise in the form of traffic, inqusitive bystanders or careless scanner operatives. We have […]

Capturing Reality in the Medium Range

Capturing Reality in the Medium Range

After several months using a pre-production Topcon GLS-2000 laser scanner, we now have a full production model and have used it on a couple of medium-sized projects already, as well as some interesting tests. As the hardware for collecting large clouds of point data become more and more similar, the focus (pardon the pun) is shifted onto what one actually does with the data. Our next post will look at […]

Scanning Cardiff Bay with the Topcon GLS-2000

Scanning Cardiff Bay with the Topcon GLS-2000

Cardiff Bay is a great place to capture a wide variety of historic and modern buildings. We’ve used this as a test for all our scanning hardware, so started off with the Pierhead Building. This was built in 1897 as the headquarters for the Bute Dock Company and remains one of the most spectacular structures in the Bay due to its ornate terracotta detailing. The examples below were acquired with the […]

Laser Scanning and Conventional Surveying

Laser Scanning and Conventional Surveying

Laser scanning involves the collection of millions of accurate points from a single scan position. By ‘conventional surveying’ we refer to total station (TS) or GPS surveys where typically one or two operators are required to record individual points. Some of the advantages – from our point of view – of the scanning technique (also referred to as Terrestrial LiDAR) are: total coverage of all visible features meaning the risk […]

Topcon GLS-2000 Field Trial Report

Topcon GLS-2000 Field Trial Report

Earlier this week we teamed up with Topcon Europe’s scanning specialists who brought their pre-production Topcon GLS-2000 laser scanner to South Wales for some field testing and feedback. Having seen the official specs at the launch in Intergeo, we were keen to test out its capabilities for real on some familiar test sites. First off we visited the Museum of Welsh Life in St. Fagans to scan St. Teilo’s Church, […]

Topcon GLS-2000 Laser Scanner

Topcon GLS-2000 Laser Scanner

Topcon have launched the GLS-2000 laser scanner – building on the success of their current lineup. We’ve recently carried out the first field tests of this instrument and will be presenting them here very soon. In the meantime, keep an eye on our twitter accountfor the latest updates! TerraDat has confidently endorsed the Topcon GLS range of laser scanners since their introduction and has enjoyed the characteristic data quality, precision, ease […]

How fast is the Topcon GLS-2000 Scanner?

How fast is the Topcon GLS-2000 Scanner?

Not an official, or recommended test by any means, but the video below gives an idea of the time it takes to do a full 360 degree scan with this instrument in high speed, 12.5mm @10m resolution (including capturing images). The video was captured using a GoPro HD Hero 3+ taped onto the front handle of the scanner. Rather than sit through the entire real time scan we’ve sped it up […]

Target Scanning with the GLS-2000

Target Scanning with the GLS-2000

As mentioned in the previous post, the Topcon GLS-2000 is a survey grade instrument that can be attached to a standard tribrach to allow occupation and backsight measurements over a known point. Previous Topcon GLS scanners used a bespoke highly reflective target that could be attached (magnetically or adhesively) to a special T mount or any flat surface. Whilst testing a production Topcon GLS-2000 laser scanner, we spotted an option under […]

Laser scanning on busy roads

Laser scanning on busy roads

httpv://www.youtube.com/watch?v=dYeFvRv0x8I&rel=0 Laser scanning targets where there are high amounts of traffic (vehicle or pedestrian) can be problematic if maximum coverage is required. The Topcon GLS-1000 scanner has the facility to undertake “detailed” scan. In this mode, it repeats the data acquisition within the specified scan area two or three times. The final dataset will contain only the most distant returns and noise will be effectively removed. The example here was on […]

Improving visual clarity of point clouds using occlusion

Improving visual clarity of point clouds using occlusion

Complex architectural scenes suffer in clarity due to points in front of and behind other data. Occlusion culling has been implemented in ScanMaster to improve visual clarity in point clouds. The image below shows a point cloud of a complex building. The aim is to examine the wall either side of the archway (viewpoint and direction annotated). With occlusion “false”, it is difficult to see foreground pounts because of may […]