topographic map


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topographic map

A map that shows the contours of the land via a two-dimensional drawing with multitudes of contour lines showing changes in elevations.Each map has its own scale.The contour lines indicate a change in elevation by the scale amount. For example, each line might represent a 1-foot change in elevation. The distance between the lines can be computed by reference to the distance scale.For example,1 inch might equal 50 feet.Two contour lines that are 1 inch apart would indicate a grade of 1 foot over the course of 50 feet, which is very gentle. The closer the lines on the topographic map, the steeper the incline.

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Geological Survey (USGS) produces geospatial databases and topographic maps for the United States of America.
SII is now seen as the authoritative source of not only framework data sets but also standard topographic map symbolization and specifications for statewide topographic mapping.
Genuine USGS topographic maps - 1:24,000 and 1:100,000 scales
This requires a surveyor's judgement to produce a good topographic map.
The US Topo program began in November 2008 as the USGS embarked on a program to create an updated series of topographic maps derived from The National Map databases.
This product depicts the standard topographic map features such as roads, contours, rivers, lakes, built-up areas, towers, spot heights, etc.
High-resolution digital ortho-rectified imagery that provides some of the feature information content now symbolized on topographic maps (see Figure 1).
Zone information is listed in the lower left-hand corner of your topographic map.
Farsi GeoTech's addition to the World Topographic Map consists of detailed feature and point of interest layers such as administrative boundaries, facilities (including parks and airports), railroads, and parcels.
This paper discusses the transition from analog to digital maps and the concept of the National Digital Cartographic Database (NDCDB); separating the topographic map into individual theme-based data layers and their importance to the National Spatial Data Infrastructure (NSDI); the recombination of these data layers into a spatial data framework, with enhanced local data, monitoring, statistical descriptions, scientific assessments, analyses, and application capabilities to form The National Map (TNM).
5-minute series topographic map and Tom Harrison Cartography's ``Trail Map of the Mammoth High Country.
The mathematical term "level set" refers to a contour, much like the curve linking points of equal elevation on a topographic map.