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

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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