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Sample Design: BLM_WY_Rawlins_draft1

Sample Design: BLM_WY_Rawlins_draft1
ID: 2514
State: Finalized
  • State: Finalized
  • Owner: Jennifer Courtwright
  • Spatial Design Category: Generalized Random Tessellation Stratified (GRTS)
  • Data Repository: <none>
  • Snapshot: 3/15/2016
  • Snapshot by: Jennifer Courtwright
  • Sites in Design: 90
  • 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.

Description

Study area: Rawlins FO

Target population all perennial streams in the Rawlins FO

Already have 8 WRSA points in this FO

Sample Design Parameters


Start Year

2016

Study Design

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Photos

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Documents

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Map of Sites

Stratum Panel Occasion

This sample design is based on master sample: Bureau of Land Management Lotic

Details of this master sample:



Frame

This sample design started with an initial frame of 67,033 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 1,239 sites:

Criteria Group 1
           
  NHD Feature Code Descriptions Is Equal To Perennial stream/river AND
  BLM Field Office Is Equal To Rawlins Field Office

Target Population

All perennial streams in the Rawlins FO


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 (2 Year(s))
# Panel Name Panel Abbr. 1 2
1
Year1
Year1
2
Year2
Year2

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
  StreamOr_1 6 Values: 1, 2, 3, 4, 5, 6
Attributes # Sites In Frame Frame Length (km) Stratum Attributes Panels
StreamOr_1 Stratum Name Stratum Abbr. Year1 Year2 # of Sites
1 585 0 1.0 S0 10 10
2 335 0 2.0 S1 5 5
3 141 0 3.0 S2 3 2
4 102 0 4.0 S3 2 1
5 64 0 5.0 S4 1 2
6 12 0 6.0 S5 0 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: 1,239
Number of sites after generating the GRTS sample: 90
Number of oversamples: 48
Number of panels: 2
Number of strata: 6

Shapefile

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Distribution

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


  Schema   Attribute   Description

PROJCS["USA_Contiguous_Albers_Equal_Area_Conic_USGS_version",GEOGCS["GCS_North_American_1983",DATUM["D_North_American_1983",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Albers"],PARAMETER["False_Easting",0.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",-96.0],PARAMETER["Standard_Parallel_1",29.5],PARAMETER["Standard_Parallel_2",45.5],PARAMETER["Latitude_Of_Origin",23.0],UNIT["Meter",1.0]]