Base Flood Elevation

Base flood elevations are currently provided for the East Coast from New York to Florida, the states on the Gulf, Texas and California.

bfe_type

The API field "bfe_type" describes how the base flood elevation for a region was determined.

bfe_type description
provided The base flood elevation is provided by FEMA within the flood zone layer.
matched The base flood elevation is provided by FEMA in an additional later, and that layer only has one base flood elevation transect that intersects the flood zone polygon.
interpolated The base flood elevation is provided by FEMA in an additional later. More than one base flood elevation transect intersects the flood zone polygon, and the closest value of these is used.
extrapolated No base flood elevation is provided by FEMA for the flood zone polygon. A value is extrapolated from neighboring values.

Bodies of Water

The API returns the distance to nearest ten bodies of water. The bodies of water considered are those provided in the USGS National Hydrological Data (NHD) Set with an area greater than 0.25 square kilometers. Streams and not included. The USGS also generally does not include reservoirs, and therefore distance to these are not included.

key description
areasqkm area of the polygon in square meters (a body of water may be made of multiple polygons)
distkm distance to the body of water in kilometers
filename name of the file from USGS containing the body of water
gnis_id unique identifier provided by USGS
name name of body of water, generally only available for larger bodies of water
state US state that the body of water is in

Elevation

Elevation in feet. Data provided by USGS. Defaults to -1000000 when not available.