Mar 23 2020
2:30 pm - 4:00 pm
Track Names: Monday 2:30 - 4:00, STATEWIDE PROJECTS
Session Date: Mar 23 2020 2:30 pm - 4:00 pm
Exploring the Modernization of Forest Inventory Using Several Sources of Lidar and Stereo Satellite and Aerial Photography
Digital 3D data have become an integral part in modernizing forest inventory. However, platform and sensor characteristics, and field sampling techniques can affect the accuracy of model assisted forest inventories. This presentation will provide an overview of the objectives and results of a study implemented in northern Minnesota, where an area of approximately 20,000 acres had several overlapping types of 3D data, including: stereo aerial and satellite derived digital surface models, and three types of lidar data: high density QL1 linear lidar (55 points/m2), high density QL2 Single Photon Lidar (SPL; 33 points/m2), and low density QL3 linear lidar (1.5 points/m2). We evaluated aboveground forest biomass (AGB) models developed using stereo derived predictors, grid metrics derived from the three types of lidar, and field sampling data using 56 1/10 acre fixed radius forest inventory plots in a Random Forest modeling framework. The results show that high density linear lidar and SPL produced highly accurate models (followed by QL3 lidar and stereo derived models), and model accuracy was significantly higher for conifer plots compared to broadleaf plots for each type of 3D data. Further analyses of the models for stand-level estimates, as well as for other forest inventory metrics beyond AGB (e.g., site index, trees per acre, age, cover type, etc), are underway. Overall, the project results showed that using high density lidar for forest inventory can: cut inventory costs by about 55% (this includes both the cost of lidar and spatial analyses), enable the analysis of valuable three-dimensional information across all lands, make the forest inventory data available much faster than traditional field-based methods, and ultimately benefit many more agencies, organizations, and stakeholder groups who are hungry for an affordable way to modernize how forest inventory is conducted and are eager to use the value-added information provided by high density lidar.
Minnesota Department Of Natural Resources
The Florida Statewide Lidar Project
In 2017, Dewberry completed the ‘Florida Statewide Lidar Assessment’ Study for Florida Department for Environmental Protection to identify Florida’s business uses, requirements and benefits of topographic and bathymetric Lidar. This study and the impact of Hurricanes Irma and Michael in 2017 and 2018 led to a statewide topographic Lidar project that Dewberry is currently implementing. Dewberry has often been challenged by USGS, NOAA when unique approaches, techniques and tools are required for success. This project required > 34,000 sq. miles of airborne lidar to be collected over the Florida peninsula during a very wet winter season at the lowest tides and water levels possible, at enhanced QL1 specifications. Dewberry subcontracted lidar acquisition and a portion of lidar processing to Quantum Spatial Inc and Woolpert, as well as data acquisition to 6 other small-business partners. Over 10 lidar sensors and 6 ground survey crews were deployed simultaneously to cover the large area in the short weather window available in 2018-2019 winter season. There were unplanned challenges along the way, including a portion of the area of interest not having suitable ground conditions for collection in the season. Once data reached the data processing phase, the challenge of merging, clipping data into counties, and processing these data to meet specifications was unique. The Florida landscape is very complex with its millions of ponds and lakes, intricate coastlines, varying water levels, and emergent and floating vegetation. New processes and methodologies had to be deployed to meet the expectations and create usable data for the many stakeholders in Florida. This presentation will provide an overview of Dewberry’s experience in working in Florida on this lidar project including ground conditions and weather challenges, unique acquisition conditions, data handling, calibration and processing techniques, along with lessons learned during acquisition and processing.
Lidar Collection in Washington State
The Lidar Program at the Washington Geological Survey started in 2016 in order to map and survey natural hazards. This objective quickly expanded to include statewide coverage and collaboration with local, federal, and tribal agencies to support all state applications. Over the past four years, Washington has worked with the USGS 3D Elevation Program to complete wide area mapping, with the third and most ambitious project to date beginning in fall 2019. This presentation discusses Washington’s experience working with the 3DEP program, the state lidar plan moving forward, as well as the challenges and opportunities for lidar collection in the “Evergreen State”.
Washington Deparatment Of Natural Resources, Washington Geological Survey
Q&A and panel discussions with session presenters
There will be a 30 minute Q&A /panel discussion with the presenters of the Statewide Projects session.