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Open AccessArticle

Morphing of Building Footprints Using a Turning Angle Function

School of Resource and Environmental Sciences, Wuhan University, Wuhan 430072, China
Department of Geography and Atmospheric Science, University of Kansas, Lawrence, KS 66045, USA
Author to whom correspondence should be addressed.
Academic Editor: Wolfgang Kainz
ISPRS Int. J. Geo-Inf. 2017, 6(6), 173;
Received: 27 April 2017 / Revised: 9 June 2017 / Accepted: 13 June 2017 / Published: 14 June 2017
PDF [3714 KB, uploaded 24 June 2017]


We study the problem of morphing two polygons of building footprints at two different scales. This problem frequently occurs during the continuous zooming of interactive maps. The ground plan of a building footprint on a map has orthogonal characteristics, but traditional morphing methods cannot preserve these geographic characteristics at intermediate scales. We attempt to address this issue by presenting a turning angle function-based morphing model (TAFBM) that can generate polygons at an intermediate scale with an identical turning angle for each side. Thus, the orthogonal characteristics can be preserved during the entire interpolation. A case study demonstrates that the model yields good results when applied to data from a building map at various scales. During the continuous generalization, the orthogonal characteristics and their relationships with the spatial direction and topology are well preserved. View Full-Text
Keywords: turning angle function; morphing; building footprint; continuous generalization turning angle function; morphing; building footprint; continuous generalization

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Li, J.; Li, X.; Xie, T. Morphing of Building Footprints Using a Turning Angle Function. ISPRS Int. J. Geo-Inf. 2017, 6, 173.

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