Large scale hyperspectral data segmentation by random spatial subspace clustering

Yi Guo, Junbin Gao, Li. Feng

    Research output: Book chapter/Published conference paperConference paperpeer-review

    2 Citations (Scopus)
    4 Downloads (Pure)

    Abstract

    A novel method called spatial subspace clustering (SpatSC)for 1D hyperspectral data segmentation problem, e.g. hyperspectraldata taken from a drill hole, exploring spatial informationhas been proposed in [1]. The purpose of this exerciseis to improve interpretability of the hyperspectral data.The spatial subspace clustering has two major components inits formulation, i.e. data self reconstruction and fused lasso.The first component is mainly to separate different subspaceswhere data lie on or close to, while the second is to exploitthe spatial smoothness based on the observation of stratificationof rocks. It produces interpretable and consistent clustersby utilizing the spatial information. However, the implementationof SpatSC requires an optimization of N2 variables,where N is the number of samples in the data set. WhenN is large, for example, tens of thousands for a typical drillhole data set, the algorithm is no longer suitable for personalcomputers. To alleviate the computational intensity, we proposeto run SpatSC on a randomly chosen calibration set fromcrude spatial clustering, which is only a small proportion ofthe whole data set. The final clustering result is then propagatedcombining the crude spatial clustering and SpatSC resultson calibration set. By doing so, the computation cost isreduced by an order of two magnitude compare to the originalSpatSC. We applied this random spatial subspace clusteringalgorithm on real thermal infrared drill hole data set to showits effectiveness.
    Original languageEnglish
    Title of host publicationIGARSS 2013
    Subtitle of host publication33rd proceedings
    Place of PublicationUnited States
    PublisherIEEE
    Pages3487-3490
    Number of pages4
    ISBN (Electronic)9781479911141
    DOIs
    Publication statusPublished - 2013
    EventIEEE International Geoscience and Remote Sensing Symposium - Melbourne, Australia, Australia
    Duration: 21 Jul 201326 Jul 2013

    Conference

    ConferenceIEEE International Geoscience and Remote Sensing Symposium
    Country/TerritoryAustralia
    Period21/07/1326/07/13

    Grant Number

    • DP130100364

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