Highlights Comparison ability in built-up land measurements between the ASTER and Landsat-7 ETM+ sensors. Find out the quantitative relationships between the two sensors. Quantify the differences in mapping built-up lands between both sensors.

    Abstract Worldwide urbanization has accelerated expansion of urban built-up lands and resulted in substantial negative impacts on the global environments. Precisely measuring the urban sprawl is becoming an increasing need. Among the satellite-based earth observation systems, the Landsat and ASTER data are most suitable for mesoscale measurements of urban changes. Nevertheless, to date the difference in the capability of mapping built-up land between the two sensors is not clear. Therefore, this study compared the performances of the Landsat-7 ETM+ and ASTER sensors for built-up land mapping in the coastal areas of southeastern China. The comparison was implemented on three date-coincident image pairs and achieved by using three approaches, including per-band-based, index-based, and classification-based comparisons. The index used is the Index-based Built-up Index (IBI), while the classification algorithm employed is the Support Vector Machine (SVM). Results show that in the study areas, ETM+ and ASTER have an overall similar performance in built-up land mapping but also differ in several aspects. The IBI values determined from ASTER were consistently higher than from ETM+ by up to 45.54% according to percentage difference. The ASTER also estimates more built-up land area than ETM+ by 5.9–6.3% estimated with the IBI-based approach or 3.9–6.1% with the SVM classification. The differences in the spectral response functions and spatial resolution between relative spectral bands of the two sensors are attributed to these different performances.


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    Titel :

    Built-up land mapping capabilities of the ASTER and Landsat ETM+ sensors in coastal areas of southeastern China


    Beteiligte:
    Xu, Hanqiu (Autor:in) / Huang, Shaolin (Autor:in) / Zhang, Tiejun (Autor:in)

    Erschienen in:

    Advances in Space Research ; 52 , 8 ; 1437-1449


    Erscheinungsdatum :

    2013-07-19


    Format / Umfang :

    13 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch







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