With TeraBox, you can store approximately: 3,000,000+ photos, 2500+ video files or 6.5 million document pages. Supports online photo preview and video playing. Vegetation Indices Monthly 元 Global 0.Register for 1024 GB of permanent free cloud storage! Automatically back up your photos and videos. Vegetation Indices 16-Day 元 Global 0.05Deg CMG The MODIS VI product suite is now used successfully in all ecosystem, climate, and natural resources management studies and operational research as demonstrated by the ever increasing body of peer publications. Because the MODIS sensors aboard Terra and Aqua satellites are identical, the VI algorithm generates each 16-day composite eight days apart (phased products) to permit a higher temporal resolution product by combining both data records. From the remaining good quality VI values, a constrained view angle approach then selects a pixel to represent the compositing period (from the two highest NDVI values it selects the pixel that is closest-to-nadir).

The VI's use a MODIS-specific compositing method based on product quality assurance metrics to remove low quality pixels. The vegetation indices are retrieved from daily, atmosphere-corrected, bidirectional surface reflectance.

The two products more effectively characterize the global range of vegetation states and processes.

Two vegetation indices are derived from atmospherically-corrected reflectance in the red, near-infrared, and blue wavebands the normalized difference vegetation index (NDVI), which provides continuity with NOAA's AVHRR NDVI time series record for historical and climate applications, and the enhanced vegetation index (EVI), which minimizes canopy-soil variations and improves sensitivity over dense vegetation conditions. MODIS vegetation indices, produced on 16-day intervals and at multiple spatial resolutions, provide consistent spatial and temporal comparisons of vegetation canopy greenness, a composite property of leaf area, chlorophyll and canopy structure.

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