Instructions for downloading and displaying smooth-grid trend files from BBS data
2) Unzip (extract) the files “usacanab.zip,” “bbsgrid.zip,” and "grid_trend.zip"
3) Add Themes “usacanab.shp” and “bbsgrid.shp” to an Arcview project.
4) In the Project window, select Add Table. Choose to List Files of Type: Delimited Text (*.txt), select the file with the AOU number of your species of interest, and click OK.
5) On the new Table, select the column labeled “Grid_code.” On the Table “Attributes of Bbsgrid,” select the same column. Click the “Join” button on the toolbar (Ctrl + J). The data for your species should now be associated with the BBS grid shapefile as a new column in its Table, labeled “Tr*” (* indicating the AOU number of your species).
6) On the left side of your View, double-click on the Theme “usacanab.shp.” Load the legend file “usacanab.avl,” then click Apply. Returning to the View, double-click on the Theme “Bbsgrid.shp” and Load the legend file “gridtrendlegend.avl.” When asked to choose a Field, select “Tr*” and All, then click OK, then Apply.
With both Themes displayed (Bbsgrid.shp on top), you should now see a map of the U.S. and Canada overlaid with the BBS grid, which will grade in color according to the percent change per year of the selected species during 1966-2002.
To view this information for a different species, repeat steps 4-6 above, using the appropriate AOU number.
The shape files have the projection:
Parameter Value
Projection Albers
datum nad83
units meters
1st standard parallel 29 30 00
2nd standard parallel 45 30 00
central meridian -96 00 00
latitude of projection's origin 23 0 0
false easting 0
false northing 0