The effect of GIS data quality on infrastructure planning: School accessibility in the City of Tshwane, South Africa

Type Working Paper
Title The effect of GIS data quality on infrastructure planning: School accessibility in the City of Tshwane, South Africa
Author(s)
Publication (Day/Month/Year) 2014
URL http://researchspace.csir.co.za/dspace/bitstream/10204/7874/1/Schmitz_2014.pdf
Abstract
Worldwide geospatial datasets have become more readily available to non-expert users via the
Internet and have changed the context in which spatial data is used. The quality of the available
datasets can only be assessed if the corresponding metadata is available as well. The lack of
metadata and non-expert knowledge of users often lead to the exploitation of data in different
applications. In South Africa, the promulgation of the Spatial Data Infrastructure Act has created
the environment for the capturing and sharing of spatial data and the publishing of metadata. The
aim of this paper is to illustrate the financial cost involved when using poor quality data in
planning for infrastructure such as schools. The positional accuracy of the quality of the dataset is
evaluated by determining the locations of new schools using an original dataset and a verified
dataset for primary and secondary public schools in the City of Tshwane. The result of the study is
expressed in monetary terms and indicates that substantial amounts of money could be misspent if
the necessary metadata to evaluate the quality of a dataset is not available. The study is not aimed
at criticising the good work done by the Department of Basic Education but to illustrate the impact
that data of insufficient quality may have on decision making.

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