The National Weather Service has a number of tools to help gauge the risk of seasonal flooding, including maps that show both landscape elevations and water depth.
A USGS project to create 3D maps of the continental United States uses special high altitude, cloud-penetrating radar to collect data across Alaska’s remote expanses.
USGS, NOAA and FEMA use LiDAR elevation mapping technology to improve flood-risk assessments.
Tablet app helps the state survey its complete road and bridge system.
FEMA's mobile app now has a feature that allows citizens to photograph, geotag and explain conditions in their local area.