Theodolite
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(→Measuring polygons) |
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[[File:Theodolit.jpg|thumb|right|260px|Sketch of a theodolite with numbers indicating the functional parts. '''1:''' Vertical circle. '''2:''' Reading for vertical circle. '''3:''' Spirit level axis. '''4:''' Bulls eye spirit level. '''5:''' Plumb-bob. '''6:''' Fixation screw. '''7:''' Tripod. '''8:''' Clamps. '''9:''' Horizontal circle. '''10:''' Reading for horizontal circle. '''11:''' Horizontal axis (tilt axis). '''12:''' Clamp. '''13:''' Telescope. '''14:''' Vertical axis.]] | [[File:Theodolit.jpg|thumb|right|260px|Sketch of a theodolite with numbers indicating the functional parts. '''1:''' Vertical circle. '''2:''' Reading for vertical circle. '''3:''' Spirit level axis. '''4:''' Bulls eye spirit level. '''5:''' Plumb-bob. '''6:''' Fixation screw. '''7:''' Tripod. '''8:''' Clamps. '''9:''' Horizontal circle. '''10:''' Reading for horizontal circle. '''11:''' Horizontal axis (tilt axis). '''12:''' Clamp. '''13:''' Telescope. '''14:''' Vertical axis.]] | ||
| − | ==Measuring | + | ==Measuring polygonal chains== |
| − | + | The choice of the points (vertices) of the polygons depend on the aim of the mensuration. In most cases, one will follow the course of roads and trails. The single segments should be located in a way that other objects can be connected easily. The line segments should be relatively long, to keep the [[error propagation| Angles]] low - not less than 50 meters and, under normal circumstances, not more than 200 to 300 meters. | |
==Polar coordinate method== | ==Polar coordinate method== | ||
Revision as of 21:51, 14 May 2011
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This section is still under construction! This article was last modified on 05/14/2011. If you have comments please use the Discussion page or contribute to the article! |
Functional principle
A theodolite is used for measuring vertical and horizontal angels. The main parts are the horizontal and the vertical circles, which are scaled in gon. It is regularly placed on a tripod and features several spirit levels for adjusting the theodolite in the field.
Measuring polygonal chains
The choice of the points (vertices) of the polygons depend on the aim of the mensuration. In most cases, one will follow the course of roads and trails. The single segments should be located in a way that other objects can be connected easily. The line segments should be relatively long, to keep the Angles low - not less than 50 meters and, under normal circumstances, not more than 200 to 300 meters.
