These USGS maps show in one format and one edition the data for a land-water area previously shown separately as a topographic map and a bathymetric map. On topographic-bathymetric maps, contour lines show elevations of the land areas above sea level, and isobaths (bathymetric contours) show the form of the land below the water surface.
have a contour interval of 10 feet or less. Maps in mountainous areas may have contour intervals of 100 feet or more. The contour interval is printed in the margin of each U.S. Geological Survey (USGS) map. Bathymetric contours are shown in blue or black, depending on their location. They show the shape and slope of the ocean bottom surface.
Most USGS topographic maps use brown contours to show the shape and elevation of the terrain. Elevations are usually shown in feet, but on some maps they are in meters. Contour intervals vary, depending mainly on the scale of the map and the type of terrain.
A map of a relatively flat area may have a contour interval of 10 feet or less. Maps in mountainous areas may have contour intervals of 100 feet or more. The contour interval is printed in the margin of each U.S. Geological Survey (USGS) map. Bathymetric contours are shown in blue or black, depending on their location. They show the shape and ...
Does anyone have a source for topographic maps that have contour lines for every 2 feet of elevation? I have seen 1 topo map with 2 foot contour spacing and it was for a proposed sub-division. The sub-division plat map was overlayed onto the detailed topo map. I live in the Boise Idaho area in a sub-division of 5-acre properties.
The United States Geological Survey (USGS) Topographic Maps (our source) show contours by brown lines of different widths. The USGS Topo Maps in mountainous areas may have contour intervals of 100 feet or more but a map of a relatively flat area may have a contour interval of 10 feet or less.
These are general-use maps at medium scales that present elevation (contour lines), hydrography, geographic place names, and a variety of cultural features. Current-generation topographic maps are created from digital GIS databases, and are branded "US Topo."
But mountains, canyons, or any feature with enough topographic relief will work. Get a topographic map of the feature you want to model. Digital topographic maps can be downloaded free by going to the USGS Store and clicking on "Map Locator" . Or you can order a paper topographic map from the same Web site.
An index to symbols used to read topo maps is available in the Research Center. The USGS provides a list and description of topographic map symbols as well. To find adjoining maps look for the names of the neighboring maps at the sides and corners of the topo map you are viewing, or look at the chart near the bottom right hand corner that lists the names of the surrounding maps.
US Topo Series added to topoView We've added the US Topo series to topoView, giving users access to over 3 million downloadable files from 2009 to the present day. The US Topo series is a latest generation of topographic maps modeled on the USGS historical 7.5-minute series (created from 1947-1992).