Google Earth Engine -Time Series NDVI Extraction from MODIS and Sentinel-2 Data

[@agirl3517]

Hi when u said Ndvi first one 10:45 does it mean first of all the elements? Means in first in time series?
Also I'm getting layer error: unable to transform edge.
Kindly help me with this

[@OpenGeoLab]

Yes first() means first image in image collection...we have filtered images between two dates ...so first() function will fetch first image of the filtered images between the the two dates

[@agirl3517]

@@OpenGeoLab ok sir thank you, and kindly help me to resolve the above error

[@CastleRockSF]

Sir
I want to compare NDVI from 2018 to 2022 but only for December month. how to filer imageries.

[@RajkumarRimal]

Thank you very much.

[@juliusbamah5338]

Nice video but I was confused starting from the NDVI aspect since am using MODIS (MYD09GA) and I want to calculate my NDVI, please how can I do that. Moreover, how can I perform cloud mask(clear cloud state=0) and Quality assurance QA (ideal quality = 0)?

[@martinkusi5900]

Were you able to perform cloud mask and QA? I would be happy to know how you did it

[@nasamilla3927]

If I have training points in form of a shapefile which I have imported in gee, how do I get the pixels of these points and compute their average monthly NDVI if I am working with images of 5 years?

[@guerrie6885]

Sir
I want to compare NDVI from 1977 to 2022 but only for month. how to filer imageries.and AVERAGE NDVI (periode 1984-2022)

[@hm.91]

Thanks!

[@Lesbinger]

Hello, just wanted to ask if this is also possible for NDWI? Especially for Sentinel 2.

[@aynosekeponer]

It should work if you change the definition of bands math

[@mohdzuber5618]

Hey how to download the all india states shape file ??

[@OpenGeoLab]

You can Google it
geographicalanalysis.com/gis-blog/download-free-india-shapefile-including-kashmir-and-ladakh/

[@mohdzuber5618]

@@OpenGeoLab Thank you this helped a lot. :) Can you also tell me where can I do the same for Districts?

[@nehasinghal5394]

How to get ndvi value at each pixel of the image??

[@OpenGeoLab]

Click on the pixel and see in the inspector tab onnthe top right...the value at on the clicked location will appear there...
If you want to convert the image into array of values use image.toarray() function

[@mridulsehgal7773]

hey @nehasinghal5394 were you able to resolve the problem ??

[@biplabsarkar7683]

How to download for a particular shape file?

[@osenirahman]

Hello,
Thanks for this great video. I tried to replicate this but I keep getting the error message
"Collection.first: Projection error: Unable to compute intersection of geometries in projections SR-ORG:6974: affine [231.65635826395825, 0.0, -2.0015109354E7, 0.0, -231.65635826395834, 1.0007554677003E7] and EPSG:4326: affine [1.0, 0.0, 0.0, 0.0, 1.0, 0.0]." fter adding my shapefile as ROIs. How can i correct this please. Thanks

[@b_55_ritesh26]

same problem here

[@damlanurburak2300]

this problem is happenin when i work with MODIS. I don't know the solution and can't change my shpfile's coordinate, but now i'm workin with sentinel-2 and i dont see this message

[@geologistdinesh]

Not working properly your script