A wavelet-based method for the determination of the relative resolution between remotely sensed images

Jorge Núñez, Octavi Fors, Xavier Otazu, Vicenç Palà, Román Arbiol, Maria Teresa Merino

    Research output: Contribution to journalArticleResearchpeer-review

    7 Citations (Scopus)

    Abstract

    Spatial resolution is a key parameter of all remote sensing satellites and platforms. The nominal spatial resolution of satellites is a well-known characteristic because it is directly related to the area in ground that represents a pixel in the detector. Nevertheless, in practice, the actual resolution of a specific image obtained from a satellite is difficult to know precisely because it depends on many other factors such as atmospheric conditions. However, if one has two or more images of the same region, it is possible to compare their relative resolutions. In this paper, a wavelet-decomposition-based method for the determination of the relative resolution between two remotely sensed images of the same area is proposed. The method can be applied to panchromatic, multispectral, and mixed (one panchromatic and one multispectral) images. As an example, the method was applied to compute the relative resolution between SPOT-3, Landsat-5, and Landsat-7 panchromatic and multispectral images taken under similar as well as under very different conditions. On the other hand, if the true absolute resolution of one of the images of the pair is known, the resolution of the other can be computed. Thus, in the last part of this paper, a spatial calibrator that is designed and constructed to help compute the absolute resolution of a single remotely sensed image is described, and an example of its use is presented. © 2006 IEEE.
    Original languageEnglish
    Article number1677764
    Pages (from-to)2539-2548
    JournalIEEE Transactions on Geoscience and Remote Sensing
    Volume44
    DOIs
    Publication statusPublished - 1 Sep 2006

    Keywords

    • Image resolution
    • Relative resolution
    • Wavelet decomposition

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