Scale (Map)

68 Seiten, Taschenbuch

Kurzbeschreibung des Verlags

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The scale of a map is defined as the ratio of a distance on the map to the corresponding distance on the ground. If the region of the map is small enough for the curvature of the Earth to be neglected, then the scale may be taken as a constant ratio over the whole map. (A town plan would be an example). For maps covering larger areas, or the whole Earth, it is essential to use a map projection from the sphere (or ellipsoid) to the plane. Such projections inevitably involve distortion and the scale can no longer be considered as constant. It is then necessary to introduce the concept of a variable point scale (or particular scale) which is defined as the ratio of the length of a small line element emanating from a point on the map to the length of the corresponding line element on the surface of the Earth. In general the point scale will vary with the position of the point and also the direction of the line element.

• Themen: Geowissenschaften, Geographie, Umwelt, Planung Geographie
• ISBN: 9786133022102
• Sprache: Englisch
• Erscheinungsdatum: 15.09.2010
• Größe: 220 x 150 mm
• Verlag: Betascript Publishing
• Herausgegeben von: Mariam T. Tennoe, Lambert M. Surhone, Susan F. Henssonow