UAV LiDAR approach offers a low-cost mapping alternative, appropriate for developing countries
Edinburgh, UK March 25, 2014 – Carbomap, a UK forest mapping company, today announced that it has collaborated with lAvion Jaune S.A.R.L and IRD (Institut de recherche pour le dveloppement) in France to complete the first canopy height model from the Amazon rainforest using data from the first true UAV-ready LiDAR system (called YellowScan). This approach has never been applied before in tropical rainforest.
The project, CANOPOR, coordinated by IRD was funded through the Investissements dAvenir grant managed by Agence Nationale de la Recherche (Labex CEBA), focussed on the Paracou experimental forest site in French Guiana, which is managed by CIRAD (Centre de coopration internationale en recherche agronomique pour le dveloppement).
The project as a whole had a range of different objectives linked to many aspects of forest mapping. Carbomap used its unique processing chain to generate the canopy height model using a very high density point cloud.
Data for the canopy height model was collected by mounting the YellowScan system on a manned helicopter. The helicopter then replicated the flight parameters of a typical UAV drone, and provided proof-of-concept for this approach. The UAV approach is more adapted to this type of work, in comparison to the current industry standard which uses full size aircraft for Airborne Laser Scanning (ALS) surveys, for a number of reasons. Firstly the flight altitude of a UAV is significantly lower than that of a normal surveying aircraft, which helps to overcome problems of cloud and atmospheric interference in rainforest. UAVs also fly at much lower speeds than normal aircraft, meaning that a much higher point density can be achieved. The result is a highly cost-effective system that is especially appropriate for developing countries where airborne LiDAR is expensive to deploy.
To generate the canopy height model, Carbomap used its bespoke processing chain to extract the terrain level from the point cloud. The particular challenge of this project was the high density of the forest itself, which limited the ease of identifying the ground. To do this Carbomap developed an algorithm that is capable of retrieving the few points which correspond to the ground, to generate a digital terrain model (DTM). Once this was extracted the canopy height model was determined from the height of the trees above the ground.
The next stages in Carbomaps forest mapping workflow are the extraction of other forest metrics from the data. Examples of this are the amount of aboveground biomass or carbon stored within the forest area. If multiple datasets are available over time, then the changes in forest cover can be measured. Subsequently, the changes in forest carbon can also be measured.
This international collaboration, between the Edinburgh-based Carbomap and the French organisations LAvion Jaune S.A.R.L and IRD, demonstrates the international appeal for the further development of such forest mapping approaches.
Professor Iain Woodhouse, CEO of Carbomap said, "The exciting prospect here is that it demonstrated how a UAV LiDAR can map rainforests in 3D on the landscape scale. The UAV LiDAR approach offers a low cost alternative to sending people into the field to make measurements, yet it provides much higher detail than can be achieved with satellites.
Editorial note: Images available on request
About Carbomap Ltd
Carbomap is an environmental survey company which spun out of the University of Edinburgh in 2013. The company takes forward over four years of world-class research within the University in the development of a Multispectral Canopy LiDAR, a revolutionary, patent-pending laser scanning instrument designed to fill a gap in airborne forest survey requirements. Carbomap has a world beating team. The scientific founders have international reputations in remote sensing methodologies, satellite radar mapping, forest structure mapping, carbon sequestration and airborne survey. www.carbomap.com
About Carbomap’s technology
Carbomap is pioneering a state-of-the-art approach to measuring and mapping the world’s forest carbon called Multi Spectral Canopy LiDAR, which is optimised to measure forest properties by combining the proven strengths of hyper spectral sensing with the 3D structural information from LiDAR. Carbomap can provide forest managers, carbon traders and certifying authorities with independently verified, forest map products to support their strategic decision making. Carbon investors always need to carry out due diligence and ensure quality control to minimise the investment risk. Carbomap provides cost-effective and accurate forest information to support effective decision making.
Carbomap’s approach uses four wavelengths, which offers significant advantages over existing commercially available LiDAR systems which have only a single wavelength. In addition to generating 3D maps as standard, These four wavelengths are uniquely tuned to measure the health and function of trees, thus providing information from throughout the forest, including the under-canopy vegetation, which is important for the management of fire and invasive species such as rhododendron.
"This kind of information will provide improved capacity to conduct forest inventory and to comply with the increasingly demanding policy directives intended to promote sustainable forestry, increase carbon stocks and conserve biodiversity," said Prof. Woodhouse. "Our technology provides a cost reduction of at least 50% over traditional ground survey and also provides a level of forest information that cannot be achieved with other airborne scanning systems."
About LAvion Jaune S.A.R.L
Founded 2005 by three associates, LAvion Jaune S.A.R.L started as a development and service company based on UAV technology. Reality and opportunities made it evolve to a full aerial imagery service company using manned planes and helicopters as well as UAVs. Since the beginning, its commitment to fulfills high resolution and high quality radiometric requirements has fueled its research and development department.
About LAvion Jaunes technology
LAvion Jaune has created YellowScan, an all-in-one ultra-light laser scanner intended for UAVs and other ultra-light aircrafts. With less than 2 kg, YellowScan incorporates a laser scanner head, an inertial measurement unit and a high-grade GPS. YellowScan has low power consumption (20 Watt) and extremely compact dimensions (20 x 15 x 15 cm). YellowScan is the worlds lightest standalone surveying solution for drones and other ultralight aircrafts.
YellowScan is suited for very high resolution surveys. It can operates up to 150 m above ground level with a resolution of 10 cm. Typical scan angle measurement is 50.
The system provides up to 3 echoes per shot, allowing to get topographic information under vegetation cover.
About lInstitut de Recherche pour le Dveloppement
The IRD is a French research organisation, original and unique on the European development research scene. Emphasizing interdisciplinarity, the IRD has focused its research for over 65 years on the relationship between man and its environment, in Africa, Mediterranean, Latin America, Asia and the French tropical overseas territories. Its research, training and innovation activities are intended to contribute to the social, economic and cultural development of southern countries.
About the CEBA
The Center for the study of Biodiversity in Amazonia (CEBA) is a network of 11 internationally -recognized French research laboratories involved in biodiversity research in Amazonia in different aspects: biodiscovery, ecology, genetics, modelling, biodiversity & public health, social sciences, etc.
The teams of theCEBA, based in French Guiana, mainland France and the French Antilles, bring together astaff of around 150 people in total (researchers, engineers, PhD students, etc.). The CEBA fosters cutting-edge research on biodiversity in French Guiana and enables the partner teams to lead joint projects thanks to long-term funding.
The CEBA was labelledLaboratoire dExcellence in 2011 in the framework of the calls of proposals launched by the French National Research Agency (ANR) in theInvestissements dAvenirprogramme. It will conduct its activities from 2011 until 2019.
Contact information
Danny Sullivan, 0772 497 4255, dsullivan@pergali.com
Prof Iain Woodhouse, Carbomap, info@carbomap.com
Dr. Tristan Allouis, LAvion Jaune S.A.R.L., yellowscan@lavionjaune.fr
More information
Carbomap Ltd. : http://www.carbomap.com/
lAvion Jaune S.A.R.L : http://yellowscan.lavionjaune. com/
IRD : http://en.ird.fr/
CEBA : http://www.labex-ceba.fr/en
CIRAD : http://www.cirad.fr/en
