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Detecting change in urban areas at continental scales with MODIS data

Detecting change in urban areas at continental scales with MODIS data
Detecting change in urban areas at continental scales with MODIS data
Urbanization is one of the most important components of global environmental change, yet most of what we know about urban areas is at the local scale. Remote sensing of urban expansion across large areas provides information on the spatial and temporal patterns of growth that are essential for understanding differences in socioeconomic and political factors that spur different forms of development, as well the social, environmental, and climatic impacts that result. However, mapping urban expansion globally is challenging: urban areas have a small footprint compared to other land cover types, their features are small, they are heterogeneous in both material composition and configuration, and the form and rates of new development are often highly variable across locations. Here we demonstrate a methodology for monitoring urban land expansion at continental to global scales using Moderate Resolution Imaging Spectroradiometer (MODIS) data. The new method focuses on resolving the spectral and temporal ambiguities between urban/non-urban land and stable/changed areas by: (1) spatially constraining the study extent to known locations of urban land; (2) integrating multi-temporal data from multiple satellite data sources to classify c. 2010 urban extent; and (3) mapping newly built areas (2000–2010) within the 2010 urban land extent using a multi-temporal composite change detection approach based on MODIS 250 m annual maximum enhanced vegetation index (EVI). We test the method in 15 countries in East–Southeast Asia experiencing different rates and manifestations of urban expansion. A two-tiered accuracy assessment shows that the approach characterizes urban change across a variety of socioeconomic/political and ecological/climatic conditions with good accuracy (70–91% overall accuracy by country, 69–89% by biome). The 250 m EVI data not only improve the classification results, but are capable of distinguishing between change and no-change areas in urban areas. Over 80% of the error in the change detection can be related to definitional issues or error propagation, rather than algorithm error. As such, these methods hold great potential for routine monitoring of urban change, as well as for providing a consistent and up-to-date dataset on urban extent and expansion for a rapidly evolving region.
urban areas, urbanization, cities, land cover, change detection, classification, machine learning, decision trees, data fusion, decision fusion
0034-4257
1-17
Mertes, C.M.
1a84203e-940a-4e65-b87b-996c1445e879
Schneider, A.
9624a52d-7010-4326-8105-a6a9645c5f9c
Sulla-Menashe, D.
c1bf5c76-05ff-4a6e-8f51-a191f30b30ec
Tatem, A.J.
6c6de104-a5f9-46e0-bb93-a1a7c980513e
Tan, B.
31735996-f5f7-4591-b0c1-ec78f14aa98d
Mertes, C.M.
1a84203e-940a-4e65-b87b-996c1445e879
Schneider, A.
9624a52d-7010-4326-8105-a6a9645c5f9c
Sulla-Menashe, D.
c1bf5c76-05ff-4a6e-8f51-a191f30b30ec
Tatem, A.J.
6c6de104-a5f9-46e0-bb93-a1a7c980513e
Tan, B.
31735996-f5f7-4591-b0c1-ec78f14aa98d

Mertes, C.M., Schneider, A., Sulla-Menashe, D., Tatem, A.J. and Tan, B. (2014) Detecting change in urban areas at continental scales with MODIS data. Remote Sensing of Environment, 1-17. (doi:10.1016/j.rse.2014.09.023).

Record type: Article

Abstract

Urbanization is one of the most important components of global environmental change, yet most of what we know about urban areas is at the local scale. Remote sensing of urban expansion across large areas provides information on the spatial and temporal patterns of growth that are essential for understanding differences in socioeconomic and political factors that spur different forms of development, as well the social, environmental, and climatic impacts that result. However, mapping urban expansion globally is challenging: urban areas have a small footprint compared to other land cover types, their features are small, they are heterogeneous in both material composition and configuration, and the form and rates of new development are often highly variable across locations. Here we demonstrate a methodology for monitoring urban land expansion at continental to global scales using Moderate Resolution Imaging Spectroradiometer (MODIS) data. The new method focuses on resolving the spectral and temporal ambiguities between urban/non-urban land and stable/changed areas by: (1) spatially constraining the study extent to known locations of urban land; (2) integrating multi-temporal data from multiple satellite data sources to classify c. 2010 urban extent; and (3) mapping newly built areas (2000–2010) within the 2010 urban land extent using a multi-temporal composite change detection approach based on MODIS 250 m annual maximum enhanced vegetation index (EVI). We test the method in 15 countries in East–Southeast Asia experiencing different rates and manifestations of urban expansion. A two-tiered accuracy assessment shows that the approach characterizes urban change across a variety of socioeconomic/political and ecological/climatic conditions with good accuracy (70–91% overall accuracy by country, 69–89% by biome). The 250 m EVI data not only improve the classification results, but are capable of distinguishing between change and no-change areas in urban areas. Over 80% of the error in the change detection can be related to definitional issues or error propagation, rather than algorithm error. As such, these methods hold great potential for routine monitoring of urban change, as well as for providing a consistent and up-to-date dataset on urban extent and expansion for a rapidly evolving region.

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More information

Published date: 4 December 2014
Keywords: urban areas, urbanization, cities, land cover, change detection, classification, machine learning, decision trees, data fusion, decision fusion
Organisations: Global Env Change & Earth Observation, WorldPop, Population, Health & Wellbeing (PHeW)

Identifiers

Local EPrints ID: 372558
URI: http://eprints.soton.ac.uk/id/eprint/372558
ISSN: 0034-4257
PURE UUID: b3fba2b6-d6b1-486f-b440-9807cf2928f8
ORCID for A.J. Tatem: ORCID iD orcid.org/0000-0002-7270-941X

Catalogue record

Date deposited: 16 Dec 2014 11:50
Last modified: 23 Jul 2022 02:05

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Contributors

Author: C.M. Mertes
Author: A. Schneider
Author: D. Sulla-Menashe
Author: A.J. Tatem ORCID iD
Author: B. Tan

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