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Sample Design: ID-TwinFallsDistrict

Study Design: BLM AIM Assessment, Inventory, and Monitoring (AIM) of Wadeable Lotic Systems

Sample Design: ID-TwinFallsDistrict
ID: 2555
State: Finalized
  • State: Finalized
  • Owner: Scott Miller
  • Spatial Design Category: Generalized Random Tessellation Stratified (GRTS)
  • Data Repository: <none>
  • Snapshot: 5/8/2016
  • Snapshot by: Scott Miller
  • Sites in Design: 20
  • 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.



Sample Design Parameters

Start Year


Study Design

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





Map of Sites

Stratum Panel Occasion

Area of Inference


AOI Notes


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

Details of this master sample:


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 2,555 sites:

Criteria Group 1
  BLM District Is Equal To Twin Falls District Office

Target Population

Perennial BLM streams and rivers in the Twin Falls District, ID


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
  Stream_Order_Group 3 Values: Large Streams (3&4), Rivers (5+), Small Streams (1&2)
Attributes # Sites In Frame Frame Length (km) Stratum Attributes Panels
Stream_Order_Group Stratum Name Stratum Abbr. Default
Small Streams (1&2) 1484 0 Small Streams (1&2) S0 4
Large Streams (3&4) 622 0 Large Streams (3&4) S1 1
Rivers (5+) 449 0 Rivers (5+) S2 0
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: 2,555
Number of sites after generating the GRTS sample: 20
Number of oversamples: 15
Number of panels: 1
Number of strata: 3




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

  Schema   Attribute   Description