Our organization works on Watershed Development. We intend to measure effect of watershed treatments on vegetation and cropping pattern. We plan to use satellite images for the same. NDVI maps can be generated and NDVI statistics can be calculated using satellite images. But is NDVI good enough indicator to detect changes in vegetation? How can one interprete NDVI stats and maps? How can we classify land use using NDVI?
Dear Nikhil,
It is not easy to answer your question " is NDVI good enough indicator to detect changes in vegetation?" since 'good' is a subjective term. a
NDVI might work for some vegetation types and environmental conditions, spatial resolution and more....
What satellite are you planing to use? what is the size of your watershed? what treatments will you apply? what do you expect to see as a result of these treatments? what is a 'good'/ 'bad' change as a result of the treatment? is it with natural or agricultural vegetaion?
You should look for change detection techniques. There are studies exploring in year and between year changes (look for Prof. Ozdogan M. studies and also of Dr. Thenkabail P. - they probably work on agriculture) I think they use EVI or else. I have some thoughts in that mater as well but not for this forum. There is a unique change detection method - look for prof. Karnieli A. 2014, change vector analysis - Landsat.
Many studies showed that NDVI looses sensitivity to high LAI or biomass
I have presented this as well --> Article LAI assessment of wheat and potato crops by VENμS and Sentinel-2 bands
Suggesting the REIP is not loosing sensitivity in higher biomass.
My bottom line is - in order to pick the right tool for the job you need to set the bar for successes.
Good luck
Hi dear N. Joshi
In full to Ittai's answer:
This old paper (1995) summarizes, refers and discusses most of the vegetation indices found in the literature. It presents different existing classifications of indices and proposes to group them in a new classification:
Article A review of vegetation indices
There is other newer reviews about vegetation index:
2017: Article Significant Remote Sensing Vegetation Indices: A Review of D...
2014: Article Review of vegetation indices for vegetation monitoring
2009: Conference Paper A Review of Multispectral Vegetation Indices for Biomass Estimation
2006: Article A Review of Remote Sensing and Vegetation Indices in Precision Farming
see too this research: https://www.researchgate.net/search.Search.html?type=researcher&query=review%20vegetation%20indices
Hugs. Luís P.
Dear Luis,
From a quick look, the 2017 review might be missing the SWIR region, the
NRI1510 and others.
Dear Ittai,
I just suggested papers for an overview. Thank you for calling attention to this issue!
Hugs!
See the attached articles!
https://www.sciencedirect.com/science/article/pii/S1877050915019444
Article Time Series Land Cover Mapping and Change Detection Analysis...
http://iicbe.org/upload/3309C1213023.pdf
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