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Binny Raj J R
India
Приєднався 9 тра 2014
NDVI CALCULATION IN ENVI 5 2 USING LANDSAT 8 OLI
NDVI is a type of vegetation indices that is used to estimate the likelihood that vegetation was actively growing at the time of data acquisition.
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Відео
Flaash atmospheric correction Landsat 8 OLI using ENVI 5 2
Переглядів 13 тис.6 років тому
FLAASH is a first-principles atmospheric correction tool that corrects wavelengths in the visible through near-infrared and shortwave infrared regions, up to 3 µm. (For thermal regions, use the Toolbox option Radiometric Correction ,Thermal Atmospheric Correction.) FLAASH works with most hyperspectral and multispectral sensors. Water vapor and aerosol retrieval are only possible when the image ...
what is the use of "overland retrieval alternative (460-2100)nm" in multispectral setting
Band math : (B1 le 0)*0+(B1 ge 10000)*1+(B1 gt 0 and B1 lt 10000)*float(B1)/10000
Mr. Raj, thank you very much for your informative tutorial. Do we have to do FLAASH method in the case of atmospheric correction before calculating NDVI?
Yess. It should be done
How do we generate the Aerosol that was retrieved? Can you explain the reason behind the formula used in the Bath math processing? can you also explain the EIgenvalue part?
its not easy to refer through a comment. refere some papers regarding FLAASH
How can I get the formula?
Hi Binnny, thank you for your video. What is your web site?
No website ..U can contact me in binnyrajbin002@gmail.com
¿Es posible realizar una correción atmosférica para la banda Pancromática de Landsat 8?, quisiera tener una mayor resolución de mi imagen, es por ello la pregunta.
how can we know the ground elevation?
It wiil be there in the metadata file of the image. or u can get it from google earth. metadata will be accurate
Thank you so much for making this video, it worked perfectly for Worldview imageries.
I had a problem with ACC error, about a modtran5v2r1.dll, did u guys had this kind of problem?
total video is related to flaash at,mospheric correction ???? if u say yes where u find .shp file sir tel me
depending on our work area we have to collect the shapefile by some means..ie , from govt websites
What about the initial Visibility in FLAASH steps , what is the meaning please , and thank you so much brother
you can get this info from the FLAASH Module pdf
Where to find the ROI shapes?
Background noise is very much disturbing! Also you should say why every step is done. It is not clear enough.
how did you calculate ground elevation?
Its available in metadata file of the image
enter the average scene elevation in Km above sea level. using Google Earth you can estimate this numeral
Hi! I would like to know why you used Band Math after using FLAASH? Is it enough to just use FLAASH for the correction?
why you use radiance in calibration and not reflectance ?
Thanks, but I am open to following your step working with product T-1 of Landsat. It's error "File does not appear to be a valid TIFF file". Could you help me, please?
USE ENVI 5.2
us envi 5.2 or do band by band correction (same step for all band with envi 4.8 or envi classic)