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A contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes. [4] The contour interval of a contour map is the difference in elevation between successive contour lines. [5] The gradient of the function is always perpendicular to the contour ...
The boundary of each region, an isoline, thus represents the set of locations of constant value. For example, on a topographic map, each contour line indicates an area at the listed elevation. USGS geological map of Georgia, an example of a chorochromatic map.
Isoline may refer to: Contour line (line of constant elevation or depth, sometimes used to describe other lines of constant value) A line of constant value on a map or chart. Examples include isobar (equal barometric pressure), isotherm (equal temperature), and isohyet (equal precipitation). Isoline, an opera by André Messager
Map of Europe with a 30° graticule in dark gray. A graticule (from Latin crāticula 'grill/grating'), on a map, is a graphical depiction of a coordinate system as a grid of lines, each line representing a constant coordinate value. [1] It is thus a form of isoline, and is commonly found on maps of many kinds, at scales from local to global.
Typical applications include the contour lines on topographic maps or the generation of isobars for weather maps. Marching squares takes a similar approach to the 3D marching cubes algorithm: Process each cell in the grid independently. Calculate a cell index using comparisons of the contour level(s) with the data values at the cell corners.
An isosurface is a three-dimensional analog of an isoline. It is a surface that represents points of a constant value (e.g. pressure, temperature, velocity, density) within a volume of space; in other words, it is a level set of a continuous function whose domain is 3-space. The term isoline is also sometimes used for domains of more than 3 ...
The various features shown on the map are represented by conventional signs or symbols. For example, colors can be used to indicate a classification of roads. These signs are usually explained in the margin of the map, or on a separately published characteristic sheet. [17] [18] [19] Topographic maps are also commonly called contour maps or ...
This type of flow map originally dates back to the Harness map of Ireland. [4] It focuses more on the routes of the network than its origin/destination nodes. The routes may be precise or highly generalized (as in many transit maps), and may or may not represent amount or speed of flow. A common example is a map of highway traffic.