image description
Sample Design: BLM_WY_Rawlins_draft1
  • ID: 2514
  • State: Finalized
  • Owner: Jennifer Courtwright
  • Collaborator(s): None
  • Spatial Design Category: Generalized Random Tessellation Stratified (GRTS)
  • Sites in Design: 132
  • Has Location Privacy: No
  • Data Repository: <none>
Basics

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

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

Initiation Year

2016

Retirement Year

Study Plan

BLM AIM Assessment, Inventory, and Monitoring (AIM) of Wadeable Lotic Systems v1.0

Data Repositories

<none>

Photos

<none>

Documents

<none>

Map of Sites

  • Stratum
  • Panel
  • Occasion
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Area of Inference

<none>

AOI Notes

<none>


Master Sample

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

Details of this master sample:



Frame Definition

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


Panels

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

Stratification

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 11 11
2 335 0 2.0 S1 6 6
3 141 0 3.0 S2 4 3
4 102 0 4.0 S3 2 3
5 64 0 5.0 S4 1 2
6 12 0 6.0 S5 0 1
TOTAL 0 km      

Generated Sample Sites

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: 132
Number of oversamples: 82
Number of panels: 2
Number of strata: 6

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Sample Sites

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.


Additional Design Documentation
Attributes
  Schema   Attribute   Description
Projection Details

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]]

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