Computation of Tilted Planar Areas of Real –Estate Parcels and Evaluation of their Accuracy


Abdulrazzak Ajaj

Published in

Damascus University Journal of Engineering Sciences, Volume 34, Issue 1, 2018.


The development of the surveying exploitation concepts data cope with the advanced techniques of measurements, computations, drawing of maps and the proliferation of automated systems, thus enabling data to be stored and exchanged in general. The advanced methods of digital cadastral representation have replaced the traditional manual methods of the utilization of real estate maps, especially in the field of planar area computations. This goes with the increasing depend on an accuracy requirements of computation, which the traditional methods cannot achieve as a result of the increasing values of agricultural and residential real estates.

This paper presents the most important methods in the field of planar and tilted cadastral area computations, either by using field observations or others like 3-dimensional extent (3D point coordinates), and accuracy evaluation of each suggested method.

The paper also focuses on the differences in computations of horizontal and tilted planer areas related to the mean sea level, map projection, earth surface slope and the effects of all those factors on the differences mentioned above.

This research studies and highlights the different methods in computations of 3D-space planer areas which are as close as possible to the actual situation of real estate entities, thus making use of all horizontal and vertical data available about those entities, which is accomplished by the integration of cadastral data and the digital topographic ones, in order to achieve those requirements of planar tilted area computations.

Keywords: Tilted planar area, planar area, Real estate (cadastral entity), spatial data, 3-dimensional coordinates, Computation accuracy.

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