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The Normalized Difference Vegetation Index (NDVI) has become one of the most widely used indices in remote sensing\udapplications in a variety of fields. Many studies have compared the NDVI values for different satellite sensors. Nowadays, the\udGreenhouse Gases Observing Satellite (GOSAT) was successfully launched on January 23, 2009. It is used to monitor greenhouse\udgases on the Earth's surface and also has a sensor, the Cloud Aerosol Imager (CAI), that senses red and near infrared spectrums. It\udcan also process NDVI data. Therefore, we are first compare GOSAT CAI and SPOT VGT NDVI data in different seasonal and land\udcover in East Asian, to explore the relationship between the two types of datasets, and to discuss the possibility of extending SPOT\udVGT data using GOSAT CAI NDVI data for the same area. We used GOSAT CAI Level 3 data to derive 10–day composite NDVI\udvalues for the East Asia region for November 2009 and January, April and July 2010 using the maximum value composite (MVC)\udmethod. We compared these values with 10–day composite SPOT VGT NDVI data for the same period. The results show that the\udcorrelation coefficients of regression analysis generally revealed a strong correlation between NDVI from the two sensors in\udNovember 2009 and January, April and July 2010 (0.88, 0.85, 0.77 and 0.74, respectively). The differences place may be affected by\udcloud cover. From the combined analysis of seasonal changes and land cover, we found that the correlations between the SPOT VGT\udand the GOSAT CAI NDVI data are less affected by seasonal change and the SPOT VGT data is more sensitive to high vegetation\udcoverage than the GOSAT CAI data. In the future, through continued monitoring and processing by cloud removal technology, the\udaccuracy of GOSAT CAI NDVI data will be further improved and thus be more widely used

the international archives of the photogrammetry, remote sensing and spatial information sciences/international archives of the photogrammetry, remote sensing and spatial information sciences

COMPARISON OF GOSAT CAI AND SPOT VGT NDVI DATA WITH DIFFERENT SEASON AND LAND COVER IN EAST ASIA