Modern Geodetic 2d and 3d Cadastral Mapping-A Case Study of Arat Kilo Campus
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Date
2013-06
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Addis Ababa University
Abstract
This study used satellite Global Positioning System and optical ground-based total station
positioning system in an integrated approach to determine a modern geodetic measurement based
2D and 3D cadastral system for Addis Ababa University Science Faculty usually called Arat kilo
campus. This provides a parcel-based land and cadastral property spatial and non-spatial
registration with a tie to an absolute and global geodetic positioning reference system.
Previously, cadastral land property registration was determined traditionally on a paper map
using simple architectural drawing that describes the relative location of a particular land parcel
and properties on it with respect to a well known locality names (e.g., street name, building
name, etc) – the old cadastral system has no spatial component. Now, with the advent of GPS
positioning system and optical total station this conventional cadastral system which has been
based on non-spatial parcel based registration becomes obsolesce.
The modern cadastral registration system has to tie the non-spatial administrative cadastral
component to its corresponding spatial component. The new approach uses GPS receiver and
optical total station to map the 2D and 3D representations of the cadastral properties.
GAMIT/GLOBK was used to eliminate the errors from GPS observations to establish first order
cadastral surveying fundamental control points accurate to centimeter level. This provides a
unique opportunity to establish a well distributed high accuracy (~ 5cm) second order cadastral
surveying control benchmarks using optical total station measurements with a tie to the first
order GPS-based survey control points so as to carry out high resolution 2D and 3D cadastral
mapping. The combined GPS and Total station surveying techniques have registered the 2D and
3D spatial information of about five cadastral properties occupying an area of 34376 square
meters. 26% of the 2D cadastral registration corresponds to buildings, while 1%, 1%, 2%, 1%
corresponds to Green area, playground, walkway and asphalt road respectively.
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Keywords
Green area, Playground, Walkway and asphalt road respectively