12 Mapping and Mapping Surveys

12 Mapping and Mapping Surveys - Mapping and Mapping...

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Unformatted text preview: Mapping and Mapping Surveys CE 111 Maps Maps Visual expressions of the Earths Surface Types of Maps Topographic Planimetric Physical Political Road Land Use Orthophoto Hipsometric Geologic Topological Biogeographic Physiographic Meteorological Thematic Daysymetric Isathrithmic . Types of Maps ~ Some examples Cartography Cartography:- The art and science of representing spatial position of real world objects (3-D) on a 2-D plane by means of points, lines and symbols. Maps for Civil/Construction Engineering Topographic Maps Form of land surface (contours~topography) is shown. U.S. has series of maps ~ Geological Survey Planimetric Maps Horizontal features are represented at a specified scale. Definition of Topographic Maps A graphical representation of the three dimensional shape of the earths surface. A reduced, simplified, categorized/classified, symbolized and annotated representation of the earths surface which has been projected on a horizontal plane. Planimetric Maps Show only the horizontal position of geographic and cultural features Do not show topographic features Show accurate horizontal distances Called a plan view Hypsometric Maps Show landscape relief Use contours, shading, hachures, 3-D grids Wireframe Map Topographic Maps Contain elements from both Planimetric and Hypsometric maps Features of Topographic Maps Relationship between 3D and 2D representation 3D view 2D view DEFINITION The process of constructing a map, the transferring of the meridians and parallels to a flat sheet of paper. The resulting product of this geometric exercise is called a 'map projection'. This can be done in a wide variety of ways, the principle differences being projections that show accurate area over the entire map, and those that show accurate distance....
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12 Mapping and Mapping Surveys - Mapping and Mapping...

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