Precision of cadastral surveys
2003
Randjaerv, J. (Estonian Agricultural University, Tartu (Estonia))
The aim of cadastral surveying is to determine the co-ordinates of boundary points, to compute the total enclosed area and lot areas of farming land, and to compile cadastral plans and boundary reports. The precision of analytical area computations depends on the accuracy of boundary points, the number of boundary points, and the lot size and shape. The accuracy of boundary points can be calculated by mean errors of co-ordinates or the standard errors of distance and angle measurements. The permissible error of boundary points is equal to double standard error. A failure to determine the cadastral unit boundary points is equal to double standard error. A failure to determine the cadastral unit boundary points by direct measurements from the geodetic network points makes it necessary to establish a two-step surveying network that consists of: a)cadastral survey control points, which are determined by measuring main traverses or performing static GPS-measurements; b) points of the surveying network for boundaries and details measurements, which are determined by different measurement methods (traversing, linear and angular intersections, pseudostatic GPS-measurements) based on geodetic network and cadastral survey control points. The relationship between the precision of area calculations and the required accuracy of boundary point measurements is analysed
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