Evaluation of the DisTrad thermal sharpening methodology for urban areas

Wiesam Essa, Boud Verbeiren, Johannes van der Kwast, Tim Van de Voorde, Okke Batelaan

    Research output: Contribution to journalArticle

    68 Citations (Scopus)

    Abstract

    The goal of this paper is to evaluate the DisTrad sharpening technique for deriving land surface temperatures over urban areas. While the original DisTrad technique is based on the correlation between land surface temperature and NDVI, this study evaluates the performance of DisTrad over different land covers by analysing the correlation between land surface temperature and 15 different indices: BASVI, R, B, NDWI, NDBaI, SVI, SAVI, NDBI, NDSI, UI, FC, VC, V, IBI, NDVI. In addition, we have analysed the correlation between land surface temperature and impervious percentage. These indices and land surface temperature were derived from a Landsat 7 ETM+ image of 2001 covering the city of Dublin. It is concluded that for most indices selecting 25% of the pixels with the lowest coefficient of variance increases the correlation between the index and the land surface temperature. Results show that the DisTrad technique in combination with impervious percentage sharpens urban areas at 30 m resolution most successfully. Although vegetation cover was high during acquisition of the image, the use of impervious percentage showed improved results compared to NDVI. This allows an improved estimation of spatial patterns of urban heat islands.

    Original languageEnglish
    Pages (from-to)163-172
    Number of pages10
    JournalInternational Journal of Applied Earth Observation and Geoinformation
    Volume19
    Issue number1
    DOIs
    Publication statusPublished - 2012

    Fingerprint Dive into the research topics of 'Evaluation of the DisTrad thermal sharpening methodology for urban areas'. Together they form a unique fingerprint.

  • Cite this