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 Earth’s 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 earth’s surface. A reduced, simplified, categorized/classified, symbolized and annotated representation of the earth’s 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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This note was uploaded on 09/20/2011 for the course C E 111 taught by Professor Staff during the Spring '08 term at Iowa State.

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

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