Composite AVHRR NDVI and Departure from average
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https://cmr.earthdata.nasa.gov/search/concepts/C1214608942-SCIOPS.html
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资源简介：
Since 1997 UMAC has been recieving weekly or biweekly AVHRR composite
NDVI and departure from average data for the conterminous United
States. These data are obtained from the EROS Data Center on a weekly
basis. The data are then zipped and archived on cd. Due to the
nature of our applications, the data are only acquired during the
growing season of the midwestern states, from about the 10th week of
the year to the 40th week. The NDVI composite is developed by taking
the highest NDVI value perpixel over the composite period. The
departure from average is the departure of each pixel in the composite
from an average calculated over the period from the beginning of the
project in 1989.
提供机构：
SCIOPS
