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A Comparison of Satellite-Based Estimates of Urban Agglomeration Size for the Accra Area

1
Department of Geosciences and Natural Resource Management, University of Copenhagen, Øster Voldgade 10, DK-1350 Copenhagen, Denmark
2
Institute for Scientific & Technological Information, Council for Scientific & Industrial Research, P.O. Box CT-2211 Cantonments, Accra, Ghana
3
Department of Geography and Resource Development, University of Ghana, Legon-Accra, Ghana
*
Author to whom correspondence should be addressed.
ISPRS Int. J. Geo-Inf. 2020, 9(2), 79; https://doi.org/10.3390/ijgi9020079
Received: 16 December 2019 / Revised: 18 January 2020 / Accepted: 27 January 2020 / Published: 30 January 2020
Data on the extension of urban areas are important for analyzing growth dynamics and to support the planning of transport and service provision. Satellite-based remote sensing has proven extremely useful, especially in cities that experience fast spatial growth. Different approaches to satellite-based mapping may, however, produce different results concerning urban categorization and delineation, often making direct comparison misleading. This study analyses four different satellite-based studies of urban land cover in Accra, Ghana and presents a new land cover map based on visual interpretation of segmented Sentinel-2 imagery. The methods and results, as well as the underlying definition of “urban”, are compared and discussed. One method identifies exclusively areas with man-made, impervious surfaces, such as roads and buildings, as proxies for urban extent. Other methods aim to identify a broader set of land cover types, including green spaces, which are treated as part of the mixed urban fabric. Further differences are found in the way urban fringe areas under development are classified depending on their degree of urbanization, and in the distance threshold values used for defining the urban agglomeration. For the most recent maps we identify a difference in the measured size of the Accra agglomeration of almost 100%. View Full-Text
Keywords: urban; mapping methods; remote sensing; agglomeration size; Accra urban; mapping methods; remote sensing; agglomeration size; Accra
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MDPI and ACS Style

Møller-Jensen, L.; Allotey, A.N.; Kofie, R.Y.; Yankson, P.W.K. A Comparison of Satellite-Based Estimates of Urban Agglomeration Size for the Accra Area. ISPRS Int. J. Geo-Inf. 2020, 9, 79. https://doi.org/10.3390/ijgi9020079

AMA Style

Møller-Jensen L, Allotey AN, Kofie RY, Yankson PWK. A Comparison of Satellite-Based Estimates of Urban Agglomeration Size for the Accra Area. ISPRS International Journal of Geo-Information. 2020; 9(2):79. https://doi.org/10.3390/ijgi9020079

Chicago/Turabian Style

Møller-Jensen, Lasse; Allotey, Albert N.; Kofie, Richard Y.; Yankson, Paul W.K. 2020. "A Comparison of Satellite-Based Estimates of Urban Agglomeration Size for the Accra Area" ISPRS Int. J. Geo-Inf. 9, no. 2: 79. https://doi.org/10.3390/ijgi9020079

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