US Fish and Wildlife Service"This is a contour feature set depicting a surface of predicted migration intensity (Window Passage Rate, WPR) in units of targets per square km per hour. Predictions are based on data collected from 23 spring and 22 fall locations throughout the Great Lakes by the US Fish and Wildlife Service Avian Radar Team. Predictions were generated by sampling targets from the lowest 4 of 11 areas (""windows"") of radar return arrayed altitudinally with consistently low interference (radar ""clutter""). This method allowed for greater comparability among sites as it helps control for site effects in radar returns due to clutter. Window data were further corrected for level of effort (e.g. time radar on, precipitation interference) for each site. Predictions were generated by interpolating overall WPA during this season with landscape variables (% water cover, % forest cover, night light illumination, latitude, longitude, and proximity to a Great Lake) as spatial predictors of WPR. Fields Value_Min and Value_Max contain the minimum and maximum predicted WPR values for each of 20 passage rate categories. Fields SE and CoV contain the standard error and covariance of the predicted WPR 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. "ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/d23d714bffb744668b3789f49b8bc71f_0engU.S. Fish and Wildlife Service Open DataPublicsp WPRa lo [United States]Web servicesUnited StatesLast Modified: 2021-02-08