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They are represented on two-dimensional maps as they are seen from the air, or in aerial photography. [1] These features are often digitized from orthorectified aerial photography into data layers that can be used in analysis and cartographic outputs. [2] A planimetric map is one that does not include relief data. [3]
The two straight-line distances from any point on the map to the two control points are correct. 2021 Gott, Goldberg and Vanderbei’s Azimuthal Equidistant J. Richard Gott, Dave Goldberg and Robert J. Vanderbei: Gott, Goldberg and Vanderbei’s double-sided disk map was designed to minimize all six types of map distortions.
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 ...
The USGS calls maps based on topographic surveys, but without contours, "planimetric maps." These maps show not only the contours, but also any significant streams or other bodies of water, forest cover, built-up areas or individual buildings (depending on scale), and other features and points of interest.
Outside a specific state plane zone accuracy rapidly declines, thus the system is not useful for regional or national mapping. Most state plane zones are based on either a transverse Mercator projection or a Lambert conformal conic projection. The choice between the two map projections is based on the shape of the state and its zones. States ...
This trait is useful when illustrating phenomena that depend on latitude, such as climate. Examples of pseudocylindrical projections include: Sinusoidal, which was the first pseudocylindrical projection developed. On the map, as in reality, the length of each parallel is proportional to the cosine of the latitude. [30] The area of any region is ...
In cartography, a conformal map projection is one in which every angle between two curves that cross each other on Earth (a sphere or an ellipsoid) is preserved in the image of the projection; that is, the projection is a conformal map in the mathematical sense. For example, if two roads cross each other at a 39° angle, their images on a map ...
Planimetric map of Station 9 including the rim of Van Serg. Apollo 17 panoramic camera image. Dark matrix breccia from Van Serg cratering ejecta (sample 79135). Although this material is coherent enough to maintain fractures that produce small plates and wedges, the fragments are quite friable and break from the specimen during handling.