About: Enhanced vegetation index

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The enhanced vegetation index (EVI) is an 'optimized' vegetation index designed to enhance the vegetation signal with improved sensitivity in high biomass regions and improved vegetation monitoring through a de-coupling of the canopy background signal and a reduction in atmosphere influences. EVI is computed following this equation: where: The coefficients adopted in the MODIS-EVI algorithm are: L=1, C1 = 6, C2 = 7.5, and G (gain factor) = 2.5.

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rdfs:label	مؤشر نباتي محسن (ar) Enhanced vegetation index (en)
rdfs:comment	المؤشر النباتي المحسن (بالإنجليزية: Enhanced vegetation index، اختصارًا EVI) هو مؤشر نباتي «محسن» مصمم لتعزيز إشارة الغطاء النباتي مع تحسين الحساسية في مناطق الكتلة الحيوية العالية ومراقبة نباتية محسنة من خلال فك اقتران إشارة خلفية المظلة وتقليل التأثيرات الجوية. (ar) The enhanced vegetation index (EVI) is an 'optimized' vegetation index designed to enhance the vegetation signal with improved sensitivity in high biomass regions and improved vegetation monitoring through a de-coupling of the canopy background signal and a reduction in atmosphere influences. EVI is computed following this equation: where: The coefficients adopted in the MODIS-EVI algorithm are: L=1, C1 = 6, C2 = 7.5, and G (gain factor) = 2.5. (en)
foaf:depiction
dcterms:subject	Satellite meteorology
Wikipage page ID	8519647 (xsd:integer)
Wikipage revision ID	1119165891 (xsd:integer)
Link from a Wikipage to another Wikipage	Carbon cycle Normalized Difference Vegetation Index NASA Aqua (satellite) MODIS Chlorophyll Leaf area index Aerosol Rayleigh scattering Terra (satellite) Satellite meteorology Canopy (biology) Vegetation Indices NDVI Surface reflectance
Link from a Wikipage to an external page	http://remotesensing.spiedigitallibrary.org/article.aspx%3Farticleid=707955 http://modis.gsfc.nasa.gov/data/dataprod/dataproducts.php%3FMOD_NUMBER=13 https://web.archive.org/web/20061218184501/http:/edcdaac.usgs.gov/modis/dataproducts.asp%23mod13 https://web.archive.org/web/20061219160331/http:/edcdaac.usgs.gov/main.asp https://web.archive.org/web/20061230054329/http:/tbrs.arizona.edu/cdrom/Index.html https://web.archive.org/web/20070226154627/http:/edcdaac.usgs.gov/modis/mod13q1v4.asp
sameAs	Enhanced vegetation index Enhanced vegetation index Enhanced vegetation index Enhanced vegetation index
dbp:wikiPageUsesTemplate	dbt:Notelist dbt:Reflist
thumbnail	wiki-commons:Special:FilePath/EVI.png?width=300
has abstract	المؤشر النباتي المحسن (بالإنجليزية: Enhanced vegetation index، اختصارًا EVI) هو مؤشر نباتي «محسن» مصمم لتعزيز إشارة الغطاء النباتي مع تحسين الحساسية في مناطق الكتلة الحيوية العالية ومراقبة نباتية محسنة من خلال فك اقتران إشارة خلفية المظلة وتقليل التأثيرات الجوية. (ar) The enhanced vegetation index (EVI) is an 'optimized' vegetation index designed to enhance the vegetation signal with improved sensitivity in high biomass regions and improved vegetation monitoring through a de-coupling of the canopy background signal and a reduction in atmosphere influences. EVI is computed following this equation: where: * NIR/red/blue are atmospherically-corrected and partially atmosphere corrected (Rayleigh and ozone absorption) surface reflectances * L is the canopy background adjustment that addresses non-linear, differential NIR and red radiant transfer through a canopy, and * C1, C2 are the coefficients of the aerosol resistance term, which uses the blue band to correct for aerosol influences in the red band. The coefficients adopted in the MODIS-EVI algorithm are: L=1, C1 = 6, C2 = 7.5, and G (gain factor) = 2.5. Whereas the Normalized Difference Vegetation Index (NDVI) is chlorophyll sensitive, the EVI is more responsive to canopy structural variations, including leaf area index (LAI), canopy type, plant physiognomy, and canopy architecture. The two vegetation indices complement each other in global vegetation studies and improve upon the detection of vegetation changes and extraction of canopy biophysical parameters.. Another difference between Normalized Difference Vegetation Index (NDVI) and EVI is that in the presence of snow, NDVI decreases, while EVI increases (Huete, 2002). Starting 2000, and after the launch of the two MODIS sensors on Terra (satellite) and Aqua (satellite) by NASA, EVI was adopted as a standard product by NASA and became extremely popular with users due to its ability to eliminate background and atmosphere noises, as well as its non saturation, a typical NDVI problem. EVI is currently distributed for free by the USGS LP DAAC. (en)
prov:wasDerivedFrom	wikipedia-en:Enhanced_vegetation_index?oldid=1119165891&ns=0
page length (characters) of wiki page	8161 (xsd:nonNegativeInteger)
foaf:isPrimaryTopicOf	wikipedia-en:Enhanced_vegetation_index
is Link from a Wikipage to another Wikipage of	Phenology Land cover maps Evi Vegetation index Normalized difference vegetation index
is Wikipage disambiguates of	Evi
is foaf:primaryTopic of	wikipedia-en:Enhanced_vegetation_index

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