sp day TPRa

"This is a contour feature set depicting a surface of predicted migration intensity (Target Passage Rate, TPR) in units of targets per hour. Predictions are based on data collected from 25 Spring and 22 Fall locations throughout the Great Lakes by the US Fish and Wildlife Service Avian Radar Team. Predictions were generated by interpolating overall TPR from field sites during this time period and season, with landscape variables (% water cover, % forest cover, night light illumination, latitude, longitude, and proximity to a Great Lake) as spatial predictors of TPR. Fields Value_Min and Value_Max contain the minimum and maximum predicted TPR values for each of 20 passage rate categories. Fields SE and CoV contain the standard error and covariance of the predicted TPR for each cell. See Supplementary Information for details.

The purpose of this dataset is to provide a broad view of differences in aerial migration intensity across the Upper Midwest Great Lakes region. This dataset may be used to identify general areas of greater and lesser airspace use by birds and bats. These estimates may also reflect differences in potential stopover intensity or use of terrestrial resources."