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Article

Open Access

Harmonization of Spatial Discrepancies from Land-related Data and Information Using Geospatial Technologies: A Case Study of Ol-Kalou Township in Nyandarua County, Kenya

Author(s)

Paul K. Towett Tubei, and Patroba Achola Odera

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DOI:10.17265/2332-8223/2016.02.005

Affiliation(s)

Department of Geomatic Engineering and Geospatial Information Systems, Jomo Kenya University of Agriculture and Technology, Kenya

ABSTRACT

This paper explores potential of Remote Sensing and Geospatial Information Systems as viable tools for data collection, processing, transformation and adjustment of cadastral data discrepancies often noted by geospatial practitioners during rasterization and vectorization of land related data. Necessary datasets were collected employing main approach/procedure of scanning, georeferencing, digitization, transformation and analysis in that order, to amalgamate and harmonize all datasets into one common projection and coordinate system (Universal Transverse Mercator (UTM) on Arc-Datum 1960). Discrepancies in derived areas against recorded values in land registries were noted, smaller parcels exhibited smaller discrepancies and vice versa. Discrepancies were found to be directly proportional to the parcel areas/sizes although large parcels (> 1000 m²) exhibited abnormally high discrepancies. This procedure yielded systematic discrepancies that could be minimized by use of a fifth order polynomial. Resultant residuals were found to be tolerably low and could be ignored for small parcels (< 1000 m²). Final outputs included automated GIS geodatabase cadastre, containing cadastral attributes harmonized to one projection and coordinate system that can be overlaid to other datasets from engineering design and construction works, geological and geotechnical investigation surveys, etc. tied to Remote Sensing data without the requirement of further transformations.

KEYWORDS

Coordinate transformation, georeferencing, projection systems, cadastre, spatial data discrepancies, spatial data harmonization.

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