Survey effort is a polygon feature class with the original transects – for reference.

Grids surveyed is a polygon feature class containing the 5’ latitude by 5’ longitude grid cells surveyed for all seasons combined including the grids that were surveyed but where no species were seen. In order to produce maps for a specific season a selection for these grids must be performed.

Survey points is a point feature class containing transects and observations completed in 2011.

Survey areas is a polygon feature class containing mudflats and staging areas observed for shorebirds.

Study area is a polygon feature class showing the extent of where most of the bird sightings were recorded and then used in the atlas. A few rare species have been included as well that go beyond this area.

This line outlines the basic survey route included in the survey counts. This route is the best access to areas that can be surveyed from shore.

Average grid cell density is a polygon feature class containing the average density value for each grid cell per species/groups and season.

Rare species is a point feature class containing rare species sightings.