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Attributed North American Grid-Based Offshore Sampling Frames

Updated: May 2, 2023

We have made available a sampling frame set of grid-based, finite-area frames spanning the offshore areas surrounding Canada, the United States (including Hawaii/Alaska), Mexico, and the Caribbean. These offshore grids are intended for use with the North American Bat Monitoring Program (NABat). Like NABat's continental Master Sample, the offshore sampling grids have been attributed via a Generalized Random-Tessellation Stratified survey design (see data release detailed explanation). Grid boundaries are based on World Exclusive Economic Zone oceanic political boundaries and extend into the shoreline 30 kilometers.


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