United States

The NABat program uses a “Master Sample” approach with a grid-based frame. This approach assigns a spatially balanced and randomized ordering of all 10X10 km grids from a finite grid-based sampling frame using a Generalized Random-Tessellation Stratified (GRTS) survey design. The data contained here are provisional NABat “Master Sample” grid packages. There are two primary “Master Sample” grid packages available: Continental United States (CONUS) and Alaska/Canada. To access the “Master Sample” grid package representing the entire continental Unites States, please download the “complete_conus_mastersample_10km.zip” file. This compressed file includes shape files of the entire geographic extent of the finite grid-based sampling frame, [...]