Indicator cokriging-based subpixel land cover mapping with shifted images

Qunming Wang, Wen Zhong Shi, Liguo Wang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

38 Citations (Scopus)


Subpixel mapping (SPM) is a technique for predicting the spatial distribution of land cover classes in remote sensing images at a finer spatial resolution level than those of the input images. Indicator cokriging (ICK) has been found to be an effective and efficient SPM method. The accuracy of this model, however, is limited by insufficient constraints. In this paper, the accuracy of the ICK-based SPM model is enhanced by using additional information gained from multiple shifted images (MSIs). First, each shifted image is utilized to compute the conditional probability of class occurrence at any fine spatial resolution pixel (i.e., subpixel) using ICK, and a set of conditional probability maps for all classes are generated for each image. The multiple ICK-derived conditional probability maps are then integrated, according to the estimated subpixel shifts of MSI. Lastly, class allocation at the subpixel scale is implemented to produce SPM results. The proposed algorithm was tested on two synthetic coarse spatial resolution remote sensing images and a set of real Moderate Resolution Imaging Spectroradiometer (MODIS) data. It was evaluated both visually and quantitatively. The experimental results showed that more accurate SPM results can be generated with MSI than with a single observed coarse image in conventional ICK-based SPM. In addition, the accuracy of the proposed method is higher than that of the existing Hopfield neural network (HNN)-based SPM and the HNN with MSI.
Original languageEnglish
Article number6519305
Pages (from-to)327-339
Number of pages13
JournalIEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
Issue number1
Publication statusPublished - 1 Jan 2014


  • Indicator cokriging (ICK)
  • indicator semivariogram
  • land cover
  • shifted images
  • super-resolution mapping

ASJC Scopus subject areas

  • Computers in Earth Sciences
  • Atmospheric Science


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