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Attributed North American Bat Monitoring Program (NABat) Master Sample and Grid-Based Sampling Frame


Publication Date


Talbert, C., and Reichert, B., 2018, Attributed North American Bat Monitoring Program (NABat) Master Sample and Grid-Based Sampling Frame: U.S. Geological Survey data release,


The NABat sampling frame is a grid-based finite-area frame spanning Canada, the United States, and Mexico consisting of N total number of 10- by 10-km (100-km2) grid cell sample units for the continental United States, Canada, and Alaska and 5- by 5-km (25km2) for Hawaii and Puerto Rico. This grain size is biologically appropriate given the scale of movement of most bat species, which routinely travel many kilometers each night between roosts and foraging areas and along foraging routes. A Generalized Random-Tessellation Stratified (GRTS) Survey Design draw was added to the sample units from the raw sampling grids ( This dataset represents the final 2018 NABat Sampling grid with various landscape level [...]

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Point of Contact :
Brian E Reichert
Originator :
Colin Talbert, Brian E Reichert
Metadata Contact :
Colin Talbert
Publisher :
U.S. Geological Survey
Distributor :
U.S. Geological Survey - ScienceBase
USGS Mission Area :
SDC Data Owner :
Fort Collins Science Center

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FinalAttributedNABatGrids.png thumbnail 141.31 KB image/png


The GRTS design provides solutions to several practical challenges faced by bat surveyors that are not provided by more familiar designs such as simple random, stratified, and systematic sampling. The GRTS design allows for sample site additions and deletions, supports unequal-probability selection of survey locations, and provides an approximately unbiased neighborhood-weighted variance estimator that takes advantage of the spatial structure present in the surveyed population. Attributions and extraneous cells were added to assist users of the frame.
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  • Fort Collins Science Center (FORT)
  • USGS Data Release Products

Associated Items



Additional Information


Type Scheme Key
DOI doi:10.5066/P9RRWXL6

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