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Jan 22, 2024 · Flood maps are one tool that communities use to know which areas have the highest risk of flooding. FEMA maintains and updates data through flood maps and risk assessments. Flood maps show how likely it is for an area to flood. Any place with a 1% chance or higher chance of experiencing a flood each year is considered to have a high risk.
The National Map is a suite of products and services that provide access to base geospatial information to describe the landscape of the United States and its territories. The National Map embodies 11 primary products and services and numerous applications and ancillary services. The National Map supports data download, digital and print ...
Show where Lidar is available. Show Topobathy Lidar. To obtain a list of downloadable products, draw an Area of Interest (AOI) on the map by holding the Ctrl key down while dragging a box within the map or use the AOI widget aspect_ratio. Lidar Explorer is a map viewer for downloading and viewing USGS 3DEP lidar data.
The coastal version limits the elevation range is 0 to 40 feet to highlight low-lying coastal features. If you click on the map with the "i-tool" enabled, it will show the elevation in feet where you clicked on the map when this layer is visible. Usable Map Scale Range. 1:10,000 to 1:100,000. Data Source.
Elevation is the measurement of how high a point is above sea level. It usually refers to the height of a location on the Earth's surface, rather than in the air. On the other hand, altitude is a measurement of an object's height, often indicating your distance above the ground, such as when you're in an airplane or a satellite.
Light Detection and Ranging (lidar) is a technology used to create high-resolution models of ground elevation with a vertical accuracy of 10 centimeters (4 inches). Lidar equipment, which includes a laser scanner, a Global Positioning System (GPS), and an Inertial Navigation System (INS), is typically mounted on a small aircraft.
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