image description
Sample Design: Rock Springs 2017
ID: 2643
State: Finalized
  • State: Finalized
  • Owner: Scott Miller
  • Spatial Design Category: Generalized Random Tessellation Stratified (GRTS)
  • Data Repository: <none>
  • Snapshot: 5/2/2017
  • Snapshot by: Scott Miller
  • Sites in Design: 120
  • Has Location Privacy: No

Expand All | Collapse All

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 1,348 sites:

Criteria Group 1
  BLM Field Office Is Equal To Rock Springs Field Office

Target Population

BLM perennial streams and rivers in the Rock Springs FO, WY

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 (1 Year(s))
# Panel Name Panel Abbr. 1
Year 1
Year 2
Year 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
  Stream_Order_Group 3 Values: Large Streams (3&4), Rivers (5+), Small Streams (1&2)
  PGSGPH_EIS_HAB 2 Values: In GRSG Priority Habitat, NOT IN
Attributes # Sites In Frame Frame Length (km) Stratum Attributes Panels
Stream_Order_Group PGSGPH_EIS_HAB Stratum Name Stratum Abbr. Year 1 Year 2 Year 3 # of Sites
Large Streams (3&4) In GRSG Priority Habitat 323 0 Large Streams (3&4)-In GRSG Priority Habitat LS-PHMA 3 3 4
Large Streams (3&4) NOT IN 239 0 Large Streams (3&4)-NOT IN LS 3 2 2
Rivers (5+) In GRSG Priority Habitat 74 0 Rivers (5+)-In GRSG Priority Habitat RV-PHMA 1 0 1
Rivers (5+) NOT IN 52 0 Rivers (5+)-NOT IN RV 0 1 1
Small Streams (1&2) In GRSG Priority Habitat 350 0 Small Streams (1&2)-In GRSG Priority Habitat SS-PHMA 3 4 3
Small Streams (1&2) NOT IN 310 0 Small Streams (1&2)-NOT IN SS 3 3 3
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: 1,348
Number of sites after generating the GRTS sample: 120
Number of oversamples: 80
Number of panels: 3
Number of strata: 6




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

  Schema   Attribute   Description