دراسة الأحداث البيولوجية: الفرق بين النسختين

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روبوت:إزالة الصور غير الموجودة MODIS NDVI Temporal Profile Conifer.jpg (الکود)
ط ((-[[Category: +[[تصنيف:) بوت: استبدال تلقائي للنص; تغييرات تجميلية)
ط (روبوت:إزالة الصور غير الموجودة MODIS NDVI Temporal Profile Conifer.jpg (الکود))
: <math>\mathrm{NDVI}={\mathrm{NIR}-\mathrm{red} \over \mathrm{NIR}+\mathrm{red}}</math>
 
 
[[ملف:MODIS NDVI Temporal Profile Conifer.jpg|thumb|400px|NDVI temporal profile for a typical patch of coniferous forest over a period of six years. This temporal profile depicts the growing season every year as well as changes in this profile from year to year due to climatic and other constraints. Data and graph are based on the [[MODIS]] sensor standard public vegetation index product.<ref>[http://tbrs.arizona.edu/cdrom/Index.html Tbrs, Modis Vi Cd-Rom<!-- Bot generated title -->]</ref> Data archived at the [[مختبر أوك ردج الوطني]] DAAC [http://daac.ornl.gov/], courtesy of Dr. Robert Cook.<ref>[http://daac.ornl.gov/articles/DAAC_Annual/From_the_Ground_Up.pdf 49971CU_Txt<!-- Bot generated title -->]</ref> ]]
 
The evolution of the vegetation index through time, depicted by the graph above, exhibits a strong [[ارتباط (إحصاء)]] with the typical green vegetation growth stages (emergence, vigor/growth, maturity, and harvest/senescence). These temporal curves are analyzed to extract useful parameters about the vegetation growing season (start of season, end of season, length of [[موسم زراعة]], etc.). Other growing season [[وسيط (رياضيات)]]s could potentially be extracted, and global maps of any of these growing season parameters could then be constructed and used in all sorts of [[تغير المناخ]] studies.
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