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Attributed North American Grid-Based Offshore Sampling Frames: Alaska and Canada

Metadata Updated: October 29, 2023

This sampling frame is a set of grid-based, finite-area frames spanning the offshore areas surrounding Alaska and Canada, and is intended for use with the North American Bat Monitoring Program (NABat). Alaskan and Canadian waters are combined into a single grid. A Generalized Random-Tessellation Stratified (GRTS) Survey Design draw was added to the sample units from the raw sampling grids ( The GRTS survey design algorithm assigns a spatially balanced and randomized ordering (GRTS order) to each cell within its respective framework. Grid cells are prioritized numerically; the lower the number, the higher the sampling priority. Cells can then be selected for monitoring following the GRTS order, ensuring both randomization and spatial balance. Monitoring within this standardized framework allows statistical inference to non-surveyed locations and ensures the validity of analyses at regional and range-wide scales. NABat is a continental collaboration including state and provincial, federal, and local agencies intended to standardize the collection and storage of bat data. Grid boundaries are based on World Exclusive Economic Zone oceanic political boundaries and extend into the shoreline 30 kilometers.

Access & Use Information

Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Metadata Created Date June 1, 2023
Metadata Updated Date October 29, 2023

Metadata Source

Harvested from DOI EDI

Additional Metadata

Resource Type Dataset
Metadata Created Date June 1, 2023
Metadata Updated Date October 29, 2023
Publisher U.S. Geological Survey
Identifier USGS:64235916d34e807d39bba2bc
Data Last Modified 20230407
Category geospatial
Public Access Level public
Bureau Code 010:12
Metadata Context
Metadata Catalog ID
Schema Version
Catalog Describedby
Harvest Object Id c4ee7c06-bc30-4d8a-8d48-d5559612552f
Harvest Source Id 52bfcc16-6e15-478f-809a-b1bc76f1aeda
Harvest Source Title DOI EDI
Metadata Type geospatial
Old Spatial -180.0,39.6395,-36.123,85.0
Publisher Hierarchy White House > U.S. Department of the Interior > U.S. Geological Survey
Source Datajson Identifier True
Source Hash ae302aea497b5ac257ea9f2db09993b33d9ae3afd368c3ca81be76d8a52d5425
Source Schema Version 1.1
Spatial {"type": "Polygon", "coordinates": -180.0, 39.6395, -180.0, 85.0, -36.123, 85.0, -36.123, 39.6395, -180.0, 39.6395}

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