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Upper KlamathLake Drainage
North Fork Sprague River
Upper Klamath Lake Drainage LandCover Assessment
Methodology
Slide 1-15
Land Cover Assessment MethodologyStep 1. Land cover polygons and stream polylines are digitized from 1998 color aerialphotos. All digitized polygons are drawn to capture visually like land cover features. Alldigitized line work is completed at 1:5,000 or less.Step 2. Basic land cover types are developed and assigned to individual polygons. Theland cover types used in this effort are aggregate land cover groups, such as: conifers,hardwoods, shrubs, etc.Step 3. Through simple assumptions regarding land cover succession and by examiningland cover types adjacent to major anthropogenic disturbance areas (i.e. clearcuts, roads,cultivated fields, etc.), it is possible to develop a rule set that can be used to estimatepotential land cover conditions. For example, small conifers are assumed to have thepotential to become large conifers. A high and low range is developed in areas whereuncertainty remains about land cover succession or the potential for recovery.Step 4. Automated sampling is conducted on classified land cover spatial data sets in 2-dimensions. Every 100 feet along the stream (i.e. in the longitudinal direction), bothstream banks are sampled every 15 feet, starting at the channel edge, out to 135 feet.This sampling rate results in 950 measurements of land cover per every mile of stream.Step 5. Ground level land cover data is statistically summarized and sorted by land covertype. Median values for land cover height and density can then be used to describe landcover classifications.Step 6. Land cover physical attributes can then be described in 2-dimensions sinceautomated sampling occurs in both the longitudinal and transverse directions.
Slide 2-15
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Step 1Digitize Land
CoverPolygons
and StreamPolyline at
1:5,000
Slide 3-15
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Pasture/Cultivated FieldRoadLarge MixSmall MixLarge HardwoodSmall HardwoodLarge ConiferSmall ConiferShrubs - UplandShrubs - WetlandGrasses - UplandGrasses - WetlandWaterDeveloped - Residential;25% Distribution of Shrubs75% Distribution of Shrubs
Step 2Classify Land
Cover
Land Cover Types
Slide 4-15
Potential ConditionHigh Range
Potential ConditionLow Range
Step 3Develop Potential Land Cover Condition
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Slide 5-15
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Step 4Sample Land Cover
Data Sets Red dots are stream datanodes placed at
100 foot intervals in thelongitudinal direction
Green dots representtransverse sample points for
land cover that occur atstream data nodes
Slide 6-15
Gram
inoid&
Forb
Wetland
Shrub
Dryland
Shrub
Conifers
Deciduous
Western
Juniper
Land
Cov
er H
eigh
t (fe
et)
Step 5Assign Physical Attributes to Classifications
Ground level landcover data isstatistically
summarized andsorted by
vegetation type.Median valuesallow a general
description basedon site specific
data collected inthe study area.
Vegetation heightis used here as an
example.
Slide 7-15
Using the medianvalues for each landcover type, vegetationheight can be assigned tosampled land cover data sets.The derived data is 2-dimensional sincesampling occurs in the longitudinal and transverse directions.
34.232.3
30.529.0
27.626.1
24.322.6
20.919.0
17.215.6
14.411.7
10.28.6
7.05.4
3.51.6
120'
15'
60'
0
10
20
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50
60
70
80
Step 62-Dimensional Analysis of Land Cover Attributes
Cur
rent
Con
ditio
n Ve
geta
tion
Heig
ht (f
t)
River Miles
Distan
ce fr
om
Chann
el Edg
e(ft
)
Example - North Fork Sprague Vegetation Height
120’
120 ’
0’ 0’
Slide 8-15
Upper Klamath Lake Drainage LandCover Assessment
Results
South Fork Sprague RiverSlide 9-15
Fish
hole
Cre
ek
Trou
t Cre
ek
Slide 10-15
N.F
. Spr
ague
Riv
er
S.F.
Spr
ague
Riv
er
Slide 11-15
Syca
n R
iver
- U
pper
Syca
n R
iver
- Lo
wer
Slide 12-15
Spra
gue
Riv
er -
Upp
er
Spra
gue
Riv
er -
Mid
dle
Slide 13-15
Spra
gue
Riv
er -
Low
er
Slide 14-15
Will
iam
son
Riv
er -
Upp
er
Will
iam
son
Riv
er -
Low
er
Slide 15-15