To relate our study sites to previous research, we determined the area (ha) of each site, classified our sites according to the Canadian system (National Wetlands Working Group, 1997), and identified each site's National Wetlands Inventory
category under the U.S.
United States Fish and Wildlife Service, United States Department of the Interior, National Wetlands Inventory
, Washington, D.C., USA.
(51.) For example, the National Wetlands Inventory
(Bloomington, MN: National Wetlands Inventory
Source materials included infrared aerial photography, aerial survey data, soil survey data, national wetlands inventory
maps, and field survey data.
National Wetlands Inventory
. Washington, DC: Department of the Interior, Fish and Wildlife Service.
Fish and Wildlife Service adopted the Bailey hierarchy years ago as the scientific framework for its National Wetlands Inventory
, and now the department's new National Biological Survey will use it as the basis for monitoring biodiversity.
Habitat inventory maps produced by the National Wetlands Inventory
are as much as 10 years out of date.
States and other partners use the National Wetlands Inventory
's digital wetlands maps and stares and trends information for conservation issues.