I have some Worldview Images. I want to calculate LAI index. What would be the best procedure?
The paper suggested by Ariadne is a good read. You should go through it.
By the way, what software are you using? If you have ENVI, you can just go straight into its "Band Math" utility and input this formula:
(TM4/TM3) * ((max(TM5) - TM5) / (max(TM5) - min(TM5))
Notes:
1. You have to calculate the statistics of the image first for the min and max values.
2. You need to convert your image to float utilizing something like this in the formula: e.g., float(b1) * float(b2)....where b1 and b2 represent bands.
Also, there is an equation that linked LAI to NDVI. I believe it is LAI = 0.57*exp(2.33*NDVI). Therefore, you can calculate the NDVI first and use this relationship to calculate the LAI.
Regards!
Hello Vasilis,
The attached document is a User-Guide of how to calculate LAI from MODIS satellite data. https://lpdaac.usgs.gov/sites/default/files/public/modis/docs/MODIS-LAI-FPAR-User-Guide.pdf
Hope it helps!
All the best,
Karolina
, Thank you everyone! I am going to check all of the above and come back if i have any more questions..!
Hello Everyone,
The above information is helpful to me as well. Thanks a lot . Please share how LAI and Light use efficiency can be used to calculate yield.
Hello Eric Ariel L. Salas
Can you please give me detail of the paper suggested by Ariadne for LAI?
Hi Eric Ariel L. Salas,
Would you happen to know a source for that NDVI to LAI conversion? I'm working on something similar. Thank you!
This paper also concluded the estimation of the LAI form imagery. And In this they have used RSR and SR indices for the calculation of the LAI.
faculty.geog.utoronto.ca/Chen/Chen's%20homepage/.../TGARS2006-deng-proof.pdf
I am agree with Eric
" By the way, what software are you using? If you have ENVI, you can just go straight into its "Band Math" utility and input this formula:
(TM4/TM3) * ((max(TM5) - TM5) / (max(TM5) - min(TM5))"
regards
without ground data of LAI is it possible to estimate the LAI value from the imagery only ???
dear be ware to do atmospheric and radiometric corrections then calculate the LAI
Hello everyone,
I found that many of the comments are asking for the reference of the equation between LAI and NDVI , " LAI = 0.57*exp(2.33*NDVI) " That Eric Ariel L. Salas mentioned .
I found that the equation was developed by a Japanees team from Rissho University and you can find the source in this link :
https://crisp.nus.edu.sg/~acrs2001/pdf/155SAITO.PDF
However, The equation was developed for forest LAI calculation which is different form crop LAI. Also, the the R2 value was low , (R2=0.46).
So, I added this comment in case Vasileios Kotinas or someone else found this question and needed to use the equation. You should take into account those limiting factors.
Which sensor do you use? For landsat 8 , LAI index is calculated in a two step process: 1. calculate SAVI 2. use it to calculate LAI.
SAVI= 1.1*(b4 - b3) / 0.1+(b4 - b3)
LAI= - ln[(0.69-SAVI)/0.59] / 0.91
MODIS Sensor, products is available from we can easily estimate LAI, which has very good correlation coefficient with ground data.
Thank you so much for the information. Will you please tell the values from the MODIS are highly correlated with the ground measurements of LAI ffrom LAI meter?
What could be the difference in MODIS and ground LAI data?
Welcome dear Vricha Chavan , the main difference that i observed is saturation occur after LAI 4.0. but before 4.0 it has high correlation with ground data
Saturation depends of the crop. For example, for wheat the saturation occurs at LAI=6 according to the literature.
Behnam Khorrami
Thank you. Can you tell me please, what will be the formula of LAI using Landsat 5 ?
Does anyone says the calculating LAI through Sentinel-2 satellite imagery??
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