Route-level and Polygon Coverages
The BBS collects
information on roadside bird populations, and geographic information can be
displayed at a variety of scales. The most local scale is individual
survey routes, and route paths have been digitized using funding from the
USGS Electronic National Atlas. Maps are also commonly made by statistically "smoothing"
the route level data to provide maps of relative abundance and trends that are based on a grid superimposed
on the portion of
We have developed ARC shape files for both survey route paths and the grid, and these files are available from our ftp site.
We also provide summaries at these scales of relative abundance and trend for all bird species encountered on the BBS. Data are provided as text files, that can be associated with the shape files listed above. These data files will be updated as new data become available, and hopefully in the future information will be accessible directly from the BBS database.
This page provides access to:
Maps are designed primarily for visual display of survey data. The abundances provide a view of general patterns of regional differences in counts of birds along survey routes. However, we caution users that factors such as observer differences and habitats can influence detectability of birds among routes. A variety of more sophisticated analyses should be used for ecological studies.
Relative Abundance Information to Associate with Route Paths
Trend Information to Associate with Route Paths
Abundance Information to Associate with Smoothed Grid
|Trend Information to Associate with Smoothed Grid|
|Shape Files||Projection Information and Other Details|
|Shape File of Route Paths||
Metadata from Electronic National Atlas
|Shape File of Grid File for Regional Maps||Metadata|
Please Submit Comments or Questions to:
Patuxent Wildlife Research Center
12100 Beech Forest Road
Laurel, Maryland 20708-4039 USA
E-mail: jrsauer at usgs.gov