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http://dx.doi.org/10.7780/kjrs.2015.31.2.1

Improvement of MODIS land cover classification over the Asia-Oceania region  

Park, Ji-Yeol (Department of Atmospheric Sciences, Kongju National University)
Suh, Myoung-Seok (Department of Atmospheric Sciences, Kongju National University)
Publication Information
Korean Journal of Remote Sensing / v.31, no.2, 2015 , pp. 51-64 More about this Journal
Abstract
We improved the MODerate resolution Imaging Spectroradiometer (MODIS) land cover map over the Asia-Oceania region through the reclassification of the misclassified pixels. The misclassified pixels are defined where the number of land cover types are greater than 3 from the 12 years of MODIS land cover map. The ratio of misclassified pixels in this region amounts to 17.53%. The MODIS Normalized Difference Vegetation Index (NDVI) time series over the correctly classified pixels showed that continuous variation with time without noises. However, there are so many unreasonable fluctuations in the NDVI time series for the misclassified pixels. To improve the quality of input data for the reclassification, we corrected the MODIS NDVI using Correction based on Spatial and Temporal Continuity (CSaTC) developed by Cho and Suh (2013). Iterative Self-Organizing Data Analysis (ISODATA) was used for the clustering of NDVI data over the misclassified pixels and land cover types was determined based on the seasonal variation pattern of NDVI. The final land cover map was generated through the merging of correctly classified MODIS land cover map and reclassified land cover map. The validation results using the 138 ground truth data showed that the overall accuracy of classification is improved from 68% of original MODIS land cover map to 74% of reclassified land cover map.
Keywords
MODIS land cover map; Asia-Oceania; misclassification; reclassification;
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