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Sample Design: King County, WA - Stratified Panel design
ID: 10
State: Finalized
  • State: Finalized
  • Owner: Matt Deniston
  • Spatial Design Category: Generalized Random Tessellation Stratified (GRTS)
  • Data Repository: <none>
  • Snapshot: 6/1/2012
  • Snapshot by: Matt Deniston
  • Sites in Design: 350
  • Has Location Privacy: No

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The details of this Sample Design, including all the parameters used to generate it, are included below. Sample designs must belong to a Study Design.


Started with the WA DNR master sample, and then refined the frame to only Municipal Watersheds in King County and streams of Strahler Order 0, 1, or 2. I then stratified based on Ecoregion and Strahler Order to ensure I got a spread of sites in the Puget Lowlands as well as in the Cascades.

Sample Design Parameters

Start Year


Study Design

Middle Fork Snoqualmie River ISEMP Field Manual of Scientific Protocols for Water Quality Surveys within the Upper Columbia Monitoring Strategy v1.0





Map of Sites

Stratum Panel Occasion

Area of Inference


AOI Notes


This sample design is based on master sample: Washington Statewide Master Sample

Details of this master sample:


This sample design started with an initial frame of 387,237 sites, based on its master sample. The criteria (based on the master sample's attributes) were then used to refine the sample frame down to 1,337 sites:

Criteria Group 1
  County Is Equal To King County AND
  Land Management Type Is Equal To Municipal Watershed

Criteria Group 2
  Strahler Order Is Equal To 0 OR
  Strahler Order Is Equal To 1 OR
  Strahler Order Is Equal To 2

Target Population


Panel designs can help address sampling objectives by increasing the total number of samples at a lower overall cost. A common panel structure involves one or more panels with a high revisit frequency (e.g. an “Annual” panel), and other panels with a lower revisit frequency (e.g. a three year “Rotating” panel).

Panel Sampling Occasion (3 Year(s))
# Panel Name Panel Abbr. 1 2 3
Rotating 1
Rotating 2
Rotating 3

This design uses the following attributes to create the stratification shown below. Each row in the table represents a stratum. This design’s panels are also shown in the table, even if it uses only a single, default panel.

Sample Attributes
  Attribute   Values In Frame
  STRAH_ORD 3 Values: 0, 1, 2
  ECOREG3_NM 3 Values: Cascades, North Cascades, Puget Lowland
Attributes # Sites In Frame Frame Length (km) Stratum Attributes Panels
STRAH_ORD ECOREG3_NM Stratum Name Stratum Abbr. Annual Rotating 1 Rotating 2 Rotating 3 # of Sites
0 Cascades 759 0 StrahlerOrder0-Cascades SO-Casc 10 5 5 5
0 North Cascades 243 0 StrahlerOrder0-North Cascades SO-NCas 10 5 5 5
0 Puget Lowland 24 0 StrahlerOrder0-Puget Lowland SO-PuSo 6 3 3 3
1 Cascades 167 0 StrahlerOrder1-Cascades S1-Casc 10 5 5 5
1 North Cascades 62 0 StrahlerOrder1-North Cascades S1-NCas 10 5 5 5
1 Puget Lowland 15 0 StrahlerOrder1-Puget Lowland S1-PuSo 4 2 2 2
2 Cascades 48 0 StrahlerOrder2-Cascades S2-Casc 10 5 5 5
2 North Cascades 8 0 StrahlerOrder2-North Cascades S2-NCas 2 1 1 1
2 Puget Lowland 11 0 StrahlerOrder2-Puget Lowland S2-PuSo 2 1 1 1
TOTAL 0 km      

Below is the complete list of sample sites that were drawn using the criteria for this sample design.

Number of sites before generating the GRTS sample: 1,337
Number of sites after generating the GRTS sample: 350
Number of oversamples: 190
Number of panels: 4
Number of strata: 9




The histogram charts below show the distribution of this sample design’s sites across the various panels and strata.

  Schema   Attribute   Description

PROJCS["NAD_1983_HARN_StatePlane_Washington_South_FIPS_4602_Feet", GEOGCS["GCS_North_American_1983_HARN", DATUM["D_North_American_1983_HARN", SPHEROID["GRS_1980",6378137.0,298.257222101]], PRIMEM["Greenwich",0.0], UNIT["Degree",0.0174532925199433]], PROJECTION["Lambert_Conformal_Conic"], PARAMETER["False_Easting",1640416.666666667], PARAMETER["False_Northing",0.0], PARAMETER["Central_Meridian",-120.5], PARAMETER["Standard_Parallel_1",45.83333333333334], PARAMETER["Standard_Parallel_2",47.33333333333334], PARAMETER["Latitude_Of_Origin",45.33333333333334], UNIT["Foot_US",0.3048006096012192]]