Yes, depression contours are identified with tick marks in 3D Elevation Program products, but only in large scale contours (1:36,000 scale to 1:18,000 scale).
Related Content
At what scales are contours visible in The National Map Viewer?
In the default base map for The National Map Advanced Viewer: 500-foot contours are visible at a scale of 1:578,000 (zoom level 10) 100-foot contours are visible at scales of 1:289,000-1:144,000 (zoom level 11-12) 50-foot contours are visible at a scale of 1:72,000 (zoom level 13) Large scale contours are visible at scales from 1:36,000-1:9,000 (zoom levels 14-16)
What are the projection, horizontal and vertical datum, format, and distributed tile extent of 3D Elevation Program (3DEP) contours?
Contours are not projected, but are provided in geographic coordinates (latitude and longitude) in units of decimal degrees, and horizontally referenced to the North American Datum of 1983. Contour elevation values are vertically referenced to the North American Vertical Datum of 1988. Contours are staged in Esri File Geodatabase 10.1 or Shapefile format, and distributed in 1x1 degree tiles.
The National Map—New data delivery homepage, advanced viewer, lidar visualization
The 3D Elevation Program—Supporting California's Economy
Comparing methods used by the U.S. Geological Survey Coastal and Marine Geology Program for deriving shoreline position from lidar data
The 3D Elevation Program—Flood risk management
Related Content
- FAQ
At what scales are contours visible in The National Map Viewer?
In the default base map for The National Map Advanced Viewer: 500-foot contours are visible at a scale of 1:578,000 (zoom level 10) 100-foot contours are visible at scales of 1:289,000-1:144,000 (zoom level 11-12) 50-foot contours are visible at a scale of 1:72,000 (zoom level 13) Large scale contours are visible at scales from 1:36,000-1:9,000 (zoom levels 14-16)
What are the projection, horizontal and vertical datum, format, and distributed tile extent of 3D Elevation Program (3DEP) contours?
Contours are not projected, but are provided in geographic coordinates (latitude and longitude) in units of decimal degrees, and horizontally referenced to the North American Datum of 1983. Contour elevation values are vertically referenced to the North American Vertical Datum of 1988. Contours are staged in Esri File Geodatabase 10.1 or Shapefile format, and distributed in 1x1 degree tiles.
- Multimedia
- Publications
The National Map—New data delivery homepage, advanced viewer, lidar visualization
As one of the cornerstones of the U.S. Geological Survey’s (USGS) National Geospatial Program, The National Map is a collaborative effort among the USGS and other Federal, State, and local partners to improve and deliver topographic information for the Nation. The National Map is featuring direct links to new and improved GIS data access utilities on a refreshed data delivery homepage at https://wAuthorsThe 3D Elevation Program—Supporting California's Economy
IntroductionCalifornia faces unprecedented challenges presented by shifting weather patterns that are defining a “new normal.” The result has been extreme weather events, prolonged drought, flooding, and debris flows. These conditions drive severe tree mortality, increase wildfire occurrence and intensity, reduce water availability, and hasten subsidence in groundwater basins. Collectively, theseAuthorsCarol L. Ostergren, Drew Decker, William J. Carswell,Comparing methods used by the U.S. Geological Survey Coastal and Marine Geology Program for deriving shoreline position from lidar data
The U.S. Geological Survey Coastal and Marine Geology Program uses three methods to derive a datum-based, mean high water shoreline on open-ocean coasts from light detection and ranging (lidar) elevation surveys. This work compared the shorelines produced by the three methods for two different surveys: one survey with simple beach morphology, and one survey with complex beach morphology. For the sAuthorsAmy S. Farris, Kathryn M. Weber, Kara S. Doran, Jeffrey H. ListThe 3D Elevation Program—Flood risk management
Flood-damage reduction in the United States has been a longstanding but elusive societal goal. The national strategy for reducing flood damage has shifted over recent decades from a focus on construction of flood-control dams and levee systems to a three-pronged strategy to (1) improve the design and operation of such structures, (2) provide more accurate and accessible flood forecasting, and (3)AuthorsWilliam J. Carswell,, Vicki Lukas - News