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Tucci, M. and A. Giordano (2011).
"Positional accuracy, positional uncertainty, and feature change
detection in historical maps: Results of an experiment." Computers,
Environment and Urban Systems 35(6): 452-463.
The measurement and management of positional accuracy and
positional uncertainty is especially problematic in historical
cartography and Historical GIS applications, for at least two
reasons: first, historical sources, and especially historical
maps, generally carry a higher degree of positional inaccuracy and
uncertainty compared to contemporary geographic databases; second,
it is always difficult and often impossible to reliably measure
the positional accuracy and positional uncertainty of the spatial
attribute of historical data. As an added complication, the terms
“inaccuracy” and “uncertainty” are often used as synonyms in the
literature, with relatively little attention given to issues of
uncertainty. In this article we propose a methodology for
detecting the positional inaccuracy and positional uncertainty of
measurements of urban change using historical maps at a very high
spatial resolution (the building). A widely accepted and routinely
employed method for detecting urban change, and spatial change in
general, consists in overlaying two or more maps created at
different dates, but the technique can lead to the formation of
spurious changes—typically, sliver polygons—that are the product
of misclassification error or map misalignment rather than actual
modifications in land cover. In this paper we develop an algorithm
to detect such spurious changes. More in general, we extend the
discussion to examine the effects of positional uncertainty and
positional inaccuracy in feature change detection analysis. The
case-study is the city of Milan, Italy.
--
Dr. Duane F. Marble Email: dmarble at OregonFast.net
2226 Primrose Lane Telephone: 541.902.8837
Florence, OR 97439 Cell: 541.991.1730
Emeritus Professor of Geography -- The Ohio State University
Courtesy Professor of Geosciences -- Oregon State University
"Would you tell me, please, which way I ought to walk from here?"
"That depends a good deal on where you want to get to," said the Cat.
"I don’t much care where," said Alice.
"Then it doesn’t matter which way you walk."
-- Lewis Carroll, Alice in Wonderland
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