What should be on your radar… Current research directions for enhanced forest inventory. Doug Pitt CFRU Workshop 2015 Orono, Jan. 22 Overview… Changes in cost:benefit Point clouds from photos Terrestrial LiDAR Species prediction Substrate prediction Growing the inventory Fibre attribute prediction Alternative platforms Habitat & ecological indicators Increased resolution; lower costs Despite rapid changes in technology, you will never be sorry for a WTW LiDAR acquisition today… M. Woods M. Woods LiDAR 2005 M. Woods LiDAR 2012 - Remote Sensing 4: 830-848 Signal waveform Point clouds from photos through photogrammetric pixel matching… M. Woods - Forests 4: 518-536 LiDAR DTM + Photos for updates? Photo point cloud Height (m) LiDAR point cloud Mean: 7.95 m Std_Dev: 6.66 m P50: 5.08 m P90: 17.85 m M. Woods Mean: 16.15m Std_Dev: 2.12 m P50: 15.98 m P90: 18.89 m LiDAR DTM + Photos for updates? Ave. DBH (cm) BA(m²/ha) PHOTO 30 Sawlog vol. (m³/ha) 50 250 40 200 30 150 20 100 10 50 25 20 15 10 10 15 20 25 30 0 0 10 20 30 40 50 0 0 50 100 150 LiDAR - Can. J. Rem. Sens. 40(3): 214-232 200 250 Terrestrial LiDAR… J-F Cote L-Architect… (LiDAR data to tree architecture) FPOptitek - Env. Modelling and Software 26: 761-777 - Agr. and Forest Meteorology 166: 72-85 - Remote Sensing 39(S1): 41-59 Species classification (ITC) M. Woods - P.E.R.S. 72: 1287-1297 - PCI software package …from LiDAR ? ~ 1 return /m2… 20m 20m - Woods et al. (in prep.) Actual (%) n = 346 plots; 86 used for validation: Predicted (%) H HC H: 91 4 HC: 100 CH: 9 9 C: 4 CH 4 C 82 96 … with higher resolutions M. Woods - Segma (Benoit St-Onge, UQAM) Substrate prediction WAM http://www.youtube.com/watch?v=LsnB9vV-QEY …building on WAM? Add slope, aspect, species preference… …to predict soil texture? @ 10-m pixel resolution – overall accuracy 79% - Geoderma 13-24: 239-240 Environmental input variables: • Elevation (10m) • Slope (%) • Surface shape (Curvature) • Mode of deposition (NOEGTS) • Landcover • Slope Position from TPI • (macro window = 1km) • (medium window = 500m) • (micro window = 20m) • Wetness Index Growing the inventory Site Index D. Pitt Age Height D. Pitt …fibre attribute prediction? Predicted Sb wood density (kg/m3) 700 600 500 400 400 500 600 700 Observed Sb wood density (kg/m3) D. Pitt - Forest Science 59: 231-242 - Canadian J. Forest Research 44: 416-475 Alternative platforms… NHRI Institut de recherche sur les feuillus nordiques Northern Hardwoods Research Institute D. Cormier Udayalakshmi.Vepakomma@fpinnovations.ca Gaetan.pelletier@umoncton.ca Sustainability; Habitat / indicators D. Pitt D. Pitt D. Pitt dthompso@NRCan.gc.ca The future is exciting… D. Pitt dpitt@NRCan.gc.ca …aiding photo interp.? LiDAR Predicted GMV Raster Use LiDAR rasters to create polygons? Better DTM! M. Woods Ontario Base Map (20-m) If there’s one good reason to invest in LiDAR, this is it! LiDAR (1-m) So what is LiDAR? Rapid pulses of laser light Sensor records return times, converted to distances GPS= x, y, z Multiple returns 1st return 2nd Last J. White D. Pitt Basic products Digital Surface Model (DSM) Digital Terrain Model (DTM) B. St. Onge Canopy Height Model (CHM) LiDAR for EFI height Point clouds to inventory predictions... D(%) M. Woods LiDAR for EFI Predicted stand volume - total (m3/ha) Predicted Inventory attributes (e.g., GTV) are related to these point-cloud statistics... 350 Sb GTV (m3/ha) = 31.46 + 1.78(mean · p90) 300 250 200 tvol 150 1:1 100 50 0 0 50 100 150 200 250 300 350 Actual Actual stand volume - total (m3/ha) M. Penner