Evaluation of Landscape Vegetation Inventory 2014 Forest Analysis & Inventory Branch (FAIB)
Jan 21, 2016
Evaluation of Landscape
Vegetation Inventory2014
Forest Analysis & Inventory Branch (FAIB)
Agenda
Overview of the LVI methodology and background of the LVI projects (Xiaoping)
Summary of the evaluation results
1. WL ground vs LVI estimates (Margaret)
2. WL ground vs kNN (IAN)
3. QN ground vs LVI (Xiaoping) Summary and next steps
• A new and low cost inventory at landscape level• Applications: TSR, silviculture and inventory planning,
strategic analysis• Completed Quesnel TSA west (1 million ha) in 2011• Williams Lake TSA west (1.7 million ha) 2014.
2. Landscape Vegetation Inventory (LVI)
LVI Design
Interpolation and classification
Classification map and attribute database
DCS Sampling
(attributes)
Landsat Segmentation
and Stratification(spatial)
Fo
rest
An
alys
is &
Inve
nto
ry
Bra
nch
INITIAL SEGMENTS PHOTO INTERPRETED SAMPLES
M
AT
CH
ING
U
NK
NO
WN
TO
KN
OW
N
SAMPLING
MAPPING
MAPPINGOPTIONS
2908 photo samples
• WL: 84 9-points clusters, plus 31 CMI plots • QN: 83 9-points clusters• Objectives:
- Primary: assess sample estimates at population level- Secondary: assess DCS photo interpretation and kNN
To integrate a ground sampling into LVI
3. Ground Sampling
Cost and Benefit Analysis• Landsat segmentation and classification done in-house
• The major cost components: photo acquisition, interpretation, kNN and analysis
WL: $0.12 /ha, QN: $0.10 /ha,
• Ground sampling: WL: $0.11/haQN: $0.12/ha
0 0.5 1 1.5 2 2.5 3 3.50
1
2
3
4
5
6
7
8
9
f(x) = 1.82312739558481 x − 0.108074142533151R² = 0.546218847599442
Dead Net Volume (Weighted 4plots+)
Photo
Gro
un
d
0 50 100 150 200 250 3000
50
100
150
200
250
300
350
WSV of All Seegments - MS
Photo Volume (m3/ha)
Gro
un
d V
olu
me
(m3/
ha)
0 50 100 150 200 250 3000
100
200
300
400
f(x) = 1.40345710747193 xR² = 0.838891402424212
WSV of DCS Seegments - MS
Photo Volume (m3/ha)
Gro
un
d V
olu
me
(m3/
ha)
0 20 40 60 80 100 1200
50
100
150
200
250
f(x) = 0.940748973120875 x + 11.0542946261751R² = 0.32102145293602
wsv of DCS - SBPS
Photo Volume (m3/ha)
Gro
un
d V
olu
me
(m3/
ha)
0 50 100 150 200 250 300 3500
100
200
300
400
500
wsv of All Segments - SBPS
Photo Volume (m3/ha)
Gro
un
d V
olu
me
(m3/
ha)
1. Overall LVI estimates of live tree volume, species, and height/age are in agreement with the ground
2. Photo interpretation significantly underestimates dead trees
3. Inconsistent utilization and net down processes in VDYP7 and ground compiler
4. Adjustment: dead volume, and live BA
5. Needs for improving interpretation of basal area and TPH
6. Improve classification (kNN and alternatives)
Summary
LVI Database: FLNR internal:
\\mitten.dmz\ftp\external\!publish\LVI\WL_database\LVI_database.gdb
External: http://www.for.gov.bc.ca/ftp/hts/external/!publish/LVI/WL_databases/LVI_database.gdb
The LVI polygon layer will be cut into VRIMS and published in LRDW after 2014 projection