Laird Van Damme Ian Gillies Shawn Mizon Brad …Ian Gillies Shawn Mizon Brad Chaulk Arnold Rudy Ben...
Transcript of Laird Van Damme Ian Gillies Shawn Mizon Brad …Ian Gillies Shawn Mizon Brad Chaulk Arnold Rudy Ben...
Aerial Mapping 1920s
Aerial Photography 1940s…FRI 1960s
Satellite Imagery 1970s-present (e.g. Landcover 28)
Digital Aerial Imaging late 1990s….eFRI 2005
Active Sensors 2000s(e.g. LiDAR, RADAR)
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NRCAN
•Remote Sensing Used for Maps, Stratification and Interpretation •Location Most Important Value versus volume (plot based CFI in US and Europe)
< 1 m
20-30 m
250 m
< 10 m
spat
ial r
eso
luti
on
low
high Orthophotos 30 cm (base data layer)
Landsat 30 m – (1/2 ha changes can be detected
MODIS 250 m
Source: MNR
Standard set 1961 SFLS > Innovation
Grid ( CFI ) LiDAR Softcopy
2004 MNR > ADS 40 A few minutes per stand SFMM Pinto Stand by Stand variance in leading species ( 60% correct) ADS 40 bandwidth will help improve species calls and heights (
X.Y.Z) Bowater Grid> Growing Stock and Species comp good Age> Not
so good> KBM/U of T research Ben Kuttner)
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Stand age estimates are relied upon to estimate volumes and to associate wildlife habitat values with stands, present and future
In many circumstances photo interpreted stand age estimates based on dominant and co-dominant trees fail to reflect stand structural conditions e.g., two-tiered stands vs. single cohort vs. complex
multicohort stands that may all get similar age estimates based on estimated age of dominants
Where possible, does it not make sense to measure stand structural complexity to complement stand age estimates ?
better volume estimates, growth estimates, etc.
ability to estimate piece size distributions
more precise measurement of habitat conditions
means to ensure the intent of age-based guidelines for maintaining structure and function are met.
Digital data allows for automated classification
(adapted from Boucher et al. 2003, Nguyen 2002)
Cohort I Cohort II Cohort III
Cohort I Cohort II Cohort III
Cohort or Structure Classes Rely on Interpretation
Airborne Laser Scanner (ALS) - Small footprint discrete return light detection and ranging (LiDAR):
Woods (MNR)
usgs.gov
msstate.edu
Stand Age = 109 SF1; Class = 3
MW2 & SF1 Results
PCA 1 (37%)
-1.5 -1.0 -0.5 0.0 0.5 1.0 1.5
PC
A 2
(3
1%
)
-1.5
-1.0
-0.5
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DTOT
Dlpct
Dmpct
Dspct
Skew
CV
S
H
E
rangedbh maxdbhc
w_scale
w_shape
CCR
CCH CCE
Cohort III
Cohort IICohort I
LEGEND Diameter class variables H - diversity E - eveness S - richness Skew - coefficient of skewness CV - coefficient of variation W_scale - Weibull (W.) scale W_shape – W. shape parameter Crown class (CC) variables CCE - eveness CCR - richness CCH – diversity Tree density variables Dspct - % 2.5-9.0 cm DBH Dmpct - % 9.0-21.0 cm DBH Dlpct% - > 21.0 cm DBH DTOT - Total trees/ha Disturbance History Symbols ■ = logged ● = un-logged natural
▲ = unknown
MWSF MEAN WEIBULL CURVES
DBH (cm)
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Tre
e d
ensity (
%)
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Class 1
Class 2
Class 3
TEM-01-090
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DBH class (cm)
Tre
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TEM-01-085
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2 6 10 14 18 22 26 30 34 38 42
DBH class (cm)
Tre
es/h
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TEM-01-095
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DBH class (cm)
Tre
es/h
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Class 1 Mixedwood
Class 2 Mixedwood
Class 3 Mixedwood
Class 1 Black Spruce
SB1 Class 2
TEM-01-019
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TEM-01-036
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Tre
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Class 2 Black Spruce
Class 3 Black Spruce
• The distribution of height returns (left) reflects differences in diameter distributions (right) among cohorts at the 400 m2 plot scale
• Discriminant classification function models can be used to select return height distribution summary variables to predict cohort structure class
DBH class
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Tre
es/h
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CHT512 Stand Age = 109 SF1; Class = 3
Cohort Classification using ALS LiDAR
Automatic Point Cloud Extraction: Software
Inpho Match-T DSM Parallax Pixel-based matching Uses multiple overlapping
images (stereomodels) “Robust Filtering
Techniques” DTM Toolkit – Classifies and
filters ground, vegetation and buildings Modified from Wu et. al. 2004
A comparison of LiDAR point clouds (left), ADS40 imagery-derived point clouds (middle) and ADS40 imagery (KBM U of T IRAP)
• Colour gradient represents height differences in point heights between photogtrammetry point cloud and Lidar point cloud • Note time lag between LiDAR and ADS40 4-5 yrs. •Largest differences seen in open, quickly regenerating areas (roadsides, cutovers)
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P1 P5 P10 P25 P50 P75 P90 P95 P99
Me
an 2
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0m
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Percentile
Inpho Height
LiDAR Height
Advances in Digital Photogrammetry
• Because LiDAR pulses can penetrate canopies and generate multiple returns whereas pixel matching produces only one height per x, y coordinate the lower percentile heights differ
Results from a 256 ha study area in the Romeo Mallete Forest near Timmins, ON
Despite the limitations of imagery point clouds compared to LiDAR point clouds we believe cohort classification using INPHO point clouds may be possible.
Cohort Classification Using Digital Photogrammetry
• Why? because imagery-derived point clouds accurately measure heights in upper canopy strata. Horizontal and vertical variability in upper canopy point heights are key variables
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LiDAR/imagery combo more common
Greater precision xyz possible but at greater cost.
Sensors are providing a wider range of wave length and increased accuracies at lower costs as technology advances
Create DEM using LiDAR Maintain FRI using DSMs from:
Satellite ( 50 cm stereo launched in 2013 $10MM)
ADS 40 (Band width advantage)
Digital Camera ( Point cloud advantage depending on resolution)
Photo-LiDAR
▪ Whatever is most cost effective
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SK old roads and X-ings inventory update 2011 Trial.
Recommend pre stratification with 60 cm and verify problems with 15 cm
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AB use of LSP for compliance tendered out 2010
Opportunities in ON
Utilization
Water crossings
Retention
Stump Heights
Rutting
Aggregate Pits
Dendron 1980-2010 35-70 mm LSPs Timber Appraisal FTG
R&B Cormier 2000-2010 70mm Boom-mounted Helicopter
Platform FTG
KBM/LU CARIS 1996-2011 Partnership program for
applied research Fixed wing Small format digital FTG
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Low cost alternative to rotary wing platform
Digital technology improving rapidly
3-6 cm resolution available fixed wing
Survey grade 1-2 cm available UAVs
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More reliable and less expensive than comparable satellite imagery
Dispersion of cut-blocks
Fixed orbit of satellites
Cloud cover
Data collection can be timed to coincide with weather windows
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Complete coverage of block at high resolution
Trial using plot based approach, following WSFG protocols
Softcopy stereo interpretation
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Observations compared to field plots
Heights – good agreement
Species compositions were very similar, especially on leading species
LSP underestimated stems/ha
LSP WSFG stocking estimates varied – likely based on actual plot locations, small stems
Ground sampling and existing records always helpful and necessary in some cases to make best call possible
80k ha in 2011
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Considerable interest from licensees
Lower cost than ground survey
Permanent, repeatable, verifiable record
Additional benefits of imagery (e.g. boundary update)
Satisfies reporting and planning requirements(???)
Leaf-off conditions critical for success in most cases
Obviously more information is better
All available records, ground work,etc.
Working with licensee more efficient
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Ground surveys may or may not still be needed
Still provides substantial information in all situations
Stratify to focus field efforts where required
Some silvicultural ground rules may have to be revisited to accommodate this system
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No system is perfect WSFG Bw9 Sb1 LSP-specific protocols?
Aerial versus ground won’t match in all situations
FRI is pps (baf 2 m2/ha) FTG also pps?
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Comes down to cost, risk, and value
Ocular assessments high risk
WSFG or similar high cost
LSP high value
Medium Cost/Risk alternative
Permanent record (auditable)
Not limited to FTG, revisit for other information
Growing use/acceptance (e.g. AB/SK)
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Aerial imaging and associated technologies advancing quickly
Costs trending down ▪ Example, LiDAR 4x increase in resolution and 50% reduction in costs
over 5 years
Spatial coverage at given resolution increasing
Spectral coverage likely to follow
Becoming more manageable to process/store/access data
Point cloud data can help in segmentation and classification
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