Image

Point Clouds: Laser Scanning vs UAS Photogrammetry

12 July 2018

Are photogrammetric point clouds superior to Lidar point clouds, or is it the other way around? To address this topic of ongoing debate, a study Switzerland-based study by Lerch Weber AG conducted a terrestrial laser scanning (TLS) survey together with an unmanned aerial system (UAS) photogrammetric survey of a gravel pit.

In modern surveying, the numerous measurement methods can be divided into two broad categories: 1) on-site surveying using GNSS receivers, total stations or levels, and 2) remote sensing methods using either laser scanners (Lidar) or photogrammetry. TLS and UAS photogrammetry are popular for many projects. Accuracy, point density, acquisition time, processing time and costs are all important criteria for evaluating performance. A comparison of TLS and UAS photogrammetry on a single project cannot give decisive answers, because the choice depends on the needs of the professional and the characteristics of the project. Nevertheless, a comparison can help to indicate the relative strengths and weaknesses of TLS and UAS photogrammetry (Figure 1), which was the goal of this study.

The comparison revealed that TLS is superior when the highest level of detail is required. For larger surveying projects, however, RTK-enabled UAS photogrammetry provides sufficient levels of detail and accuracy as well as greater efficiency and improved surveyor safety.

Click here for full details.

Source: GIM International
Photo credit: Lerch Weber AG

Read More
Image

Mapping Gisborne’s worst eroding land

Gisborne land adaptation shifts have received positive feedback from both the Eastland Wood Council and an environmental group. The region’s farmers and forestry companies might end up with designated land they can’t operate on under new council plans. Council chief ...
Read more
Image

Canadian developed Hydrogen-diesel system secured

HVMS, a leading provider in the decarbonisation of transportation, has announced the establishment of its partnership with Canadian company Diesel Tech Industries, to establish installation facilities for the Guardian Hydrogen Diesel System. This initiative marks a significant step towards advancing sustainable ...
Read more
Image

Australian timber framing industry gets a boost

Forest and Wood Products Australia (FWPA) is set to spearhead an initiative highlighting the advantages of timber framing in construction, promising a significant boost to its promotion efforts. First established in the Australian Forest Products Association’s Softwood Manufacturing Chamber, and funded by ...
Read more
Image

Who’s transforming our economy with renewable resources?

The opportunities for converting forestry fibre to renewable resources to replace fossil fuel based products are growing every year. The adoption of bioenergy and related technologies / products in New Zealand and internationally, sourced from forestry and wood products companies ...
Read more
Image

New trade agreement a boost for NZ wood processors

Increased export opportunities through the removal of tariffs for 41 wood products included within the ‘Agreement on Climate Change, Trade and Sustainability’ is welcomed by New Zealand’s wood processing and manufacturing industry. ‘Under brand New Zealand we have a leading story to ...
Read more
Image

Södra to become the largest producer of kraft lignin in the world

As a step in the strategy of getting more out of every tree, Södra is now establishing a new business to become a world leader in the production of kraft lignin. Södra’s production facility will be the first commercial facility ...
Read more
Image

NZ National Exotic Forest Description survey – data needed

On 1 April 2024, the Ministry for Primary Industries (MPI) sent out the 2024 National Exotic Forest Description (NEFD) survey. The survey is critical for informing wood availability forecasts, which underpin infrastructure and wood processing investment decisions, as well as contributing to a ...
Read more
Image

Unlimited potential of virtual reality for forest thinning

How a virtual reality (VR) and gaming engine could add another tool to the forestry training kit. A future where new foresters are trained to thin trees from the safety of a virtual reality forest before more advanced real-world training could be ...
Read more
Image

Growing the potential of NZ’s forestry sector in partnership

Forestry Minister, Todd McClay, has announced the start of the Government’s plan to restore certainty and confidence in the forestry and wood processing sector. “This government will drive investment to unlock the industry’s economic potential for growth,” Mr McClay says. ...
Read more