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Urban expansion around the pyramids of Giza, Egypt: 3D change detection based on high resolution digital surface models

Marijn Hendrickx (UGent) , V De Laet, Cornelis Stal (UGent) , Alain De Wulf (UGent) and Rudi Goossens (UGent)
Author
Organization
Abstract
One of the biggest threats to cultural heritage is related to their rapidly changing and developing surroundings. The Giza pyramid plateau is a prime example of this phenomenon, as it is threatened by the enormous urban expansion of Cairo over the last decades. Documenting, monitoring and modeling such a pressure requires accurate and detailed geographic data, which can be derived from recent up-to-date, high resolution satellite images. Remote sensing techniques have proven to be very useful to visualize and analyze urban sprawl and land use changes in two dimensions. The impact assessment of urban sprawl near specific heritage sites, however; needs to be complemented with accurate 3D-information. In an attempt to do so, digital surface models (DSMs) from GeoEye-1 stereoscopic images from 2009 and 2011 have been computed in order to analyze recent urban changes. In this paper the challenges within the photogrammetric 3D change detection process are discussed. The combination of the enhanced digital terrain extraction (eATE) module of Erdas Imagine® and ground control points collected in the field provides accurate and high resolution DSMs. The small impact of shadow and different urban morphologies however influence the pixel-wise comparison of the two DSMs, which results in different approaches for different city districts. The resulting 3D change model clarifies not only the urban sprawl, but also the increase in building levels, directly related to pressure on the famous pyramids. In the future, an integration of population statistics can improve the model, hence allowing it to become a useful policy instrument.
Keywords
pyramids of Giza, Egypt, urban expansion, digital surface models, 3D change

Citation

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MLA
Hendrickx, Marijn, V De Laet, Cornelis Stal, et al. “Urban Expansion Around the Pyramids of Giza, Egypt: 3D Change Detection Based on High Resolution Digital Surface Models.” EARSeL, 32nd Symposium, Book of Abstracts. 2012. 115–115. Print.
APA
Hendrickx, Marijn, De Laet, V., Stal, C., De Wulf, A., & Goossens, R. (2012). Urban expansion around the pyramids of Giza, Egypt: 3D change detection based on high resolution digital surface models. EARSeL, 32nd Symposium, Book of abstracts (pp. 115–115). Presented at the 32nd EARSeL Symposium : Advances in geosciences.
Chicago author-date
Hendrickx, Marijn, V De Laet, Cornelis Stal, Alain De Wulf, and Rudi Goossens. 2012. “Urban Expansion Around the Pyramids of Giza, Egypt: 3D Change Detection Based on High Resolution Digital Surface Models.” In EARSeL, 32nd Symposium, Book of Abstracts, 115–115.
Chicago author-date (all authors)
Hendrickx, Marijn, V De Laet, Cornelis Stal, Alain De Wulf, and Rudi Goossens. 2012. “Urban Expansion Around the Pyramids of Giza, Egypt: 3D Change Detection Based on High Resolution Digital Surface Models.” In EARSeL, 32nd Symposium, Book of Abstracts, 115–115.
Vancouver
1.
Hendrickx M, De Laet V, Stal C, De Wulf A, Goossens R. Urban expansion around the pyramids of Giza, Egypt: 3D change detection based on high resolution digital surface models. EARSeL, 32nd Symposium, Book of abstracts. 2012. p. 115–115.
IEEE
[1]
M. Hendrickx, V. De Laet, C. Stal, A. De Wulf, and R. Goossens, “Urban expansion around the pyramids of Giza, Egypt: 3D change detection based on high resolution digital surface models,” in EARSeL, 32nd Symposium, Book of abstracts, Mykonos, Greece, 2012, pp. 115–115.
@inproceedings{3162427,
  abstract     = {{One of the biggest threats to cultural heritage is related to their rapidly changing and developing surroundings. The Giza pyramid plateau is a prime example of this phenomenon, as it is threatened by the enormous urban expansion of Cairo over the last decades. Documenting, monitoring and modeling such a pressure requires accurate and detailed geographic data, which can be derived from recent up-to-date, high resolution satellite images. Remote sensing techniques have proven to be very useful to visualize and analyze urban sprawl and land use changes in two dimensions. The impact assessment of urban sprawl near specific heritage sites, however; needs to be complemented with accurate 3D-information. In an attempt to do so, digital surface models (DSMs) from GeoEye-1 stereoscopic images from 2009 and 2011 have been computed in order to analyze recent urban changes. In this paper the challenges within the photogrammetric 3D change detection process are discussed. The combination of the enhanced digital terrain extraction (eATE) module of Erdas Imagine® and ground control points collected in the field provides accurate and high resolution DSMs. The small impact of shadow and different urban morphologies however influence the pixel-wise comparison of the two DSMs, which results in different approaches for different city districts. The resulting 3D change model clarifies not only the urban sprawl, but also the increase in building levels, directly related to pressure on the famous pyramids. In the future, an integration of population statistics can improve the model, hence allowing it to become a useful policy instrument.}},
  author       = {{Hendrickx, Marijn and De Laet, V and Stal, Cornelis and De Wulf, Alain and Goossens, Rudi}},
  booktitle    = {{EARSeL, 32nd Symposium, Book of abstracts}},
  keywords     = {{pyramids of Giza,Egypt,urban expansion,digital surface models,3D change}},
  language     = {{eng}},
  location     = {{Mykonos, Greece,}},
  pages        = {{115--115}},
  title        = {{Urban expansion around the pyramids of Giza, Egypt: 3D change detection based on high resolution digital surface models}},
  year         = {{2012}},
}