case study #3 identifying tree species from€¦ · case study #3 identifying tree species from...
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Case Study #3 Identifying Tree Species From
Geiger-Mode LiDAR Data: Compatibility and Accuracy Assessment
CAPITOL STATE FOREST
OLYMPIA, WASHINGTON
ILM
F 20
17: I
DEN
TIFY
ING
TIM
BER
SPEC
IES
FRO
M L
IDAR
DA
TA –
CAS
E ST
UDY
FE
BRU
ARY
14, 2
017
27
Project Area and Species
FEBRUARY 14, 2017 28
Project area 19.5 ha (48.1 acres) • On the western edge of
the Capitol State Forest • Flown August 2016 (leaf-
on) at a height of 8,000 ft AGL.
• 25 ppm • Four species found by the
field crew on site but only three in suitable amounts
Red Alder Douglas Fir Hemlock Cedar
Project Timeline
FEBRUARY 14, 2017 29
Nothing like a deadline!
Jan 3 Conference call Harris, Object Raku, Forsite Consultants
Jan 4 Statement of Work drafted,
discussed, revised
Jan 10 Forsite field
crew on site to collect ground
truth
Jan 13 First ground
samples rec’d by Object Raku
Jan 19 Forsite field
crew completes collection
Jan 23 Full collection
set rec’d by Object Raku
Jan 30 Object Raku completes
ground truth processing
Feb 1 Object Raku completes
calibration tests
Feb 10 Object Raku completes
accuracy testing
Ground truth sample collection
FEBRUARY 14, 2017 30
Field samples collected TSI ground truth
• Over 1,000 collected
GPS points for trees at and beneath canopy level.
• 501 samples trees processed as ground truth for use in TSI.
• Measured heights for 100 trees had an absolute error margin of 1.3m against an average height of 28m
Ground truth calibration
FEBRUARY 14, 2017 31
If Incorrect, selected:
GT TSI Correct Inc
TSI Select Over or Under % Correct % Precision FD CE HW DR
FD 256 260 246 10 4 96.1% 94.6% FD N/A 0 6 4 CE 5 4 4 1 -1 80.0% 100.0% CE 1 N/A 0 0
HW 119 111 104 15 -8 87.4% 93.7% HW 10 0 N/A 5 DR 120 125 116 4 5 96.7% 92.8% DR 3 0 1 N/A
500 500 470 30 94.0%
Species Legend
CW Western Red Cedar
FD Douglas Fir
HW Western Hemlock
DR Red Alder
32
Height Volume
Metrics & Measurements
SLOPE (%) ASPECT (deg) MIN AVERAGE MAX MIN AVERAGE MAX 3.5 48.5 164.8 0 188 315
NUMBER OF POINTS PER TREE MIN AVERAGE MAX 176 2,362 7,460
HEIGHT DISTRIBUTION (m) 5 To 9 10 To 14 15 To 19 20 To 24 25 To 29 30 To 34 35 - UP 3.6% 4.6% 10.0% 13.6% 18.2% 35.6% 14.5%
CANOPY AREA DISTRIBUTION (m2) 0 To 9 10 To 19 20 To 29 30 To 39 40 - UP 34.7% 57.9% 7.2% 0.2% 0.0%
HEIGHT (m) ELEVATION (m) MIN AVERAGE MAX MIN AVERAGE MAX 6.0 27.7 44.0 23.2 64.5 111.8
LIVE CANOPY DISTRIBUTION 0 To 9 10 To 19 20 To 29 30 To 39 40 To 49 50 To 59 60 To 69 70 To 79 80 To 89 90 - 100 1.1% 6.0% 36.7% 37.0% 11.8% 4.8% 1.3% 0.7% 0.7% 0.1%
Experiment set-up
FEBRUARY 14, 2017 33
Ground Truth by Group # Experiment sub-areas • The douglas fir,
hemlock, and alder were divided up into three sample groups.
• We then created 12 sub-areas to better manage the analysis and highlight any trends.
Accuracy Testing – Sample 1 on Sample 2
FEBRUARY 14, 2017 34
Species Legend
FD Douglas Fir
HW Western Hemlock
DR Red Alder
Areas 1 2 3 4 5 6 7 8 9 10 11 12
Sample 1 ground truth trees available
to be used in the TSI model
Sample 1-FD 6 7 1 8 1 1 10 13 6 17 10 14
Sample 1-HW 3 4 5 1 4 17 2 4 1 1 1 1
Sample 1-DR 4 5 7 9 7 2 4 1 0 0 5 0
Sample 2 - FD 4 4 1 6 0 0 6 9 4 11 6 9 Sample 2 - HW 2 3 3 1 3 11 2 1 0 0 0 0 Sample 2 - DR 3 3 5 6 4 1 3 0 0 0 4 0
AVG HGT 21.1 18.3 17.5 26.0 26.1 29.1 30.6 33.8 36.8 32.3 31.7 30.0 AVG ELEV 106.9 103.6 98.6 66.9 70.7 46.7 41.7 75.1 83.2 65.1 65.5 77.2
AVG INTENSITY 8.0 10.5 10.0 7.5 7.4 6.8 6.8 7.0 6.8 6.4 6.8 8.8
# > 80%
AVG PTS PER TREE 3,162 2,725 2,777 3,171 3,267 3,627 3,717 4,548 5,482 3,917 4,066 3,582 Areas
AVG FD HW DR Model 1 2 3 4 5 6 7 8 9 10 11 12 7 84% 83% 77% 93% 1b-304CNSR_GRP2 80% 70% 89% 77% 75% 75% 91% 100% 100% 73% 80% 100%
Accuracy Testing – Sample 1 & 2 on Sample 3
FEBRUARY 14, 2017 35
Areas 1 2 3 4 5 6 7 8 9 10 11 12
Sample 1 & 2 ground truth trees available to be used in the TSI
model
Sample1+2-FD 10 11 2 14 1 1 16 22 10 28 16 23
Sample1+2-HW 5 7 8 2 7 28 4 5 1 1 1 1
Sample1+2-DR 7 8 12 15 11 3 7 1 0 0 9 0
Sample 3 - FD 5 8 1 6 0 0 10 14 8 17 11 14 Sample 3 - CE 0 0 0 0 0 0 0 0 0 0 0 0
Sample 3 - HW 3 4 6 1 5 16 3 4 1 1 1 1
AVG HGT 21.1 18.3 17.5 26.0 26.1 29.1 30.6 33.8 36.8 32.3 31.7 30.0 AVG ELEV 106.9 103.6 98.6 66.9 70.7 46.7 41.7 75.1 83.2 65.1 65.5 77.2
AVG INTENSITY 8.0 10.5 10.0 7.5 7.4 6.8 6.8 7.0 6.8 6.4 6.8 8.8
# > 80%
AVG PTS PER TREE 3,162 2,725 2,777 3,171 3,267 3,627 3,717 4,548 5,482 3,917 4,066 3,582 Areas
AVG FD HW DR Model 1 2 3 4 5 6 7 8 9 10 11 12 7 80% 75% 82% 89% 23-482CNSR_GRP3 85% 88% 85% 75% 82% 89% 64% 76% 88% 72% 79% 80%
Species Legend
FD Douglas Fir
HW Western Hemlock
DR Red Alder
FEBRUARY 14, 2017 ILMF 2017: IDENTIFYING TIMBER SPECIES FROM LIDAR DATA – CASE STUDY 36
Cam Brown, MF, RPF Strategic Planning Forester Salmon Arm, BC Office: 250-832-3366 (ext 220) Cell: 250-833-6631
Mike Parlow Managing Director Qualicum Beach, BC Cell: 250-954-7850