NDVI and EVI time series from Sentinel-2 in Google Earth Engine [GEE]

[@ksabmagar7]

The codes are all adapted from the other sources. However, if you want the codes, let me know through the channel's page (fb.com/ktmagarsYT ) or you can email me (email is in the channel's about section). Thankyou for checking the video and comments section.

[@qZoneful]

it says "This page isn't available"

[@ksabmagar7]

@@qZoneful the link is fb.com/ktmagarsYT (the bracket causing the trouble) please check now.

[@qZoneful]

@@ksabmagar7 thank you!

[@geospatialsupport.4062]

KT Thanks For Sharing this information its really help me alot.thanks you very much keep the good Work...

[@gezahagnnegash9740]

Really, It's helpful. Thanks for sharing!

[@ZhengXIANSean]

hi, Thanks so much for your kindness!. But it‘s said 'Content cannot be displayed at this time'on your FB, How could I get the code

[@IAKhan-km4ph]

Superbly done!

[@igormishurov8589]

Thanks for the helpful video and useful links. I am however getting a syntax error: Unexpected Token 10:1 upon entering the ".filter metadata..." line in the beginning. Any ideas what could cause this? Thanks in advance!

[@ksabmagar7]

filterMetdata function is already deprecated. You can check other ee.Filter functions to filter the metadatas. Check in the docs tab. -Thankyou for the comment

[@workueshetie820]

It is a helpful video and I liked it . May I get the code plse?

[@ksabmagar7]

Please message me. thankyou.

[@EwieMira]

Simple question, but how do you de-comment several lines of code at once? Is there a shortcut for that?

[@ksabmagar7]

Oh it is simple, anything within /*. */ are comments. They are called block comments. :)

[@EwieMira]

@@ksabmagar7 Thank you!!

[@qZoneful]

Thank you for the video. I used the code, it is working but i have a problem. I have two different NDVI values for the exactly same polygon at the same date. Probably there are two different image (maybe one night and one at day time?). What can be the reason and how can i solve it?

[@ksabmagar7]

If your study area is too larger, there can be overlap of two tiers. If you check the image collections, there are images in the near/same dates, with different tiles. You can separate your polygon making it may be small for your study area, may be taking average of all the NDVI values of the area. I hope my comment helps How are you trying to do with it? -Thankyou :)

[@giuseppecillis3541]

HI, thanks too much!! Is it possible to do the same with Landsat 5 e 8 collections? Thanks in advance

[@ksabmagar7]

Yes, the process is the same. If your plan is to use of Landsat 5 and 8 together, then it might needs further steps for harmonizing them. Otherwise, process for landsat 8 alone or (landsat 5 alone) is the same. The processing concepts are the same. If you need further assistance, you are welcomed to message me in the page. This will also be a chance to practice more for me as well. - thankyou for the subscribe. thankyou! :)

[@tanmoymondal27]

Image.select: Pattern 'SCL' did not match any bands. This error showing, how to solve it??

[@ksabmagar7]

Please check the bands. There are different S2 data.

[@MonishaRFTEC]

Hi, I am getting a computation timed out error while generating the chart (plotNDVI). Any idea to rectify this. Thanks in advance

[@ksabmagar7]

Happens when your field area is big, probably choosing the small geometry or a point will solve this. Thankyou for the comment.

[@ShriGT-DeepakVerma]

Hello sir Can you please tell, while you calculating EVI so you divided band by 10000. what is the reason behind this ?

[@ksabmagar7]

Hello sir, thankyou for the question. We divide by 10000 as to work with the values conversion. This is to change the given band values to 0 to 1. More precisely, we convert the data type from int16 to float data type in earth engine. You can run this and check the data type var S2 = ee.ImageCollection("COPERNICUS/S2_SR") .first(); print('B8', S2.select('B8')) print(S2.select('B8').divide(10000)) Or follow the conversation related to this: www.researchgate.net/post/How_might_one_scale_down_the_reflectance_values_in_the_range_0-1_from_landsat_8 Hope it helps. Thankyou for the question.

[@ShriGT-DeepakVerma]

@@ksabmagar7 Thank u sir for your reply. sir, I want to calculate EVI from combined (merged) image collection of Landsat-8 and Sentinel-2, and while is used this EVI formula in combining Landsat and sentinel data I got EVI value 0 for Landsat. therefore can you help me to overcome this problem?

[@ksabmagar7]

@@ShriGT-DeepakVerma Combining the image collections might have been not easy as I can guess. Are you trying to perform this in earth engine. If both landsat and sentinel is being talked, I think there is already data prepared for this. If you are not aware about it. please check this. lpdaac.usgs.gov/data/get-started-data/collection-overview/missions/harmonized-landsat-sentinel-2-hls-overview/ May be that data can be downloaded and further worked on earth engine. Is my comment helpful in anyway? Please message me in the facebook page for more discussion. fb.com/ktmagarsYT

[@selinaycivelek1193]

Hello, 'nd' which band? When I write the 'nd' tape in the code I get this error: pattern 'nd' did not match any bands. Thanks in advance for your answer.

[@ksabmagar7]

Hello, The 'nd' is default when normalized difference function is applied. Obviously, when rename is applied, the name is something different. We can try printing the image or few images (if it's collection) to see what band has been added at the end. Also, we need to check the function to see if it's adding the band.

[@ksabmagar7]

Hello, did you solve the error? :)

[@sofypuspita7715]

Sir please make an atmosphere correction tutorial for Sentinel-2 level 1C data using the Google Earth engine because for my final project, I don't know who to ask anymore 🙏

[@ksabmagar7]

Hello, I will try exploring it may be in future content as I am a learner too. May be this discussion might help for now. www.researchgate.net/post/Atmospheric_correction_code_in_Google_Earth_Engine_GEE Or message in the facebook page if you need more help. Thankyou

[@ksabmagar7]

There is a short content now. kzbin.infoCy1etLb0kv4

[@gairikadatta7433]

When I type geom.buffer the gee is showing it's not a function.

[@ksabmagar7]

There might be mistake with the variable name. Check the variable name in the imports. -Thanks!

[@abdoulkaderkone8295]

Thank you for sharing. I would like to learn Google Earth Engine, I was not able to create an account. I ask for your help to create an account.

[@ksabmagar7]

Go to this link and try signing up. If your current gmail doesnot work, try another gmail account. Link: signup.earthengine.google.com/ -Thanks!

[@gopim8857]

Please Can in get this code

[@ksabmagar7]

Please email.

[@alshareefthatalulaqaysali9135]

Could u provide me NDVI and EVI time series from Sentinel-2 in Google Earth Engine [GEE] codes please .

[@ksabmagar7]

please email me.

[@alshareefthatalulaqaysali9135]

@@ksabmagar7 Thanks 4 help.

[@ksabmagar7]

:)

[@w.w.8951]

Hi, could you please share the code? Thanks

[@ksabmagar7]

Please message in the fb page.

[@muddasirahmadakhoon8458]

I din't find your email id on your page and page is showing page not found.

[@ksabmagar7]

please check about section.

[@muddasirahmadakhoon6044]

@@ksabmagar7 I check it but it is not there. Could you share your email here

[@ksabmagar7]

@@muddasirahmadakhoon6044 yes, email me in [e-mail], you could have found in ABOUT section of the channel. -thankyou

[@osenirahman]

Hello, Thanks for the tutorial. I keep getting this error when I tried to create chart using shapefile. 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]. How can I resolve this please

[@ksabmagar7]

Can you try changing the projections of image. The projections of modis might be causing that. developers.google.com/earth-engine/guides/projections

[@osenirahman]

@@ksabmagar7 Many thanks

[@kirankumarmohapatra2447]

can i get this code

[@ksabmagar7]

Hi there, you can check the codes from the important links in the description. All the codes are from the developers.google.cn/earth-engine/guides?hl=zh-cn You can find the main codes here: bjnnowak.netlify.app/2021/09/10/gee-ndvi-time-series/ Thanks!

[@fakharulislam2519]

Code plz

[@ksabmagar7]

You can find the codes from the relevant links from the description. Or email me if you want to the codes. The email is in about section. -Thankyou : )

[@fakharulislam2519]

@@ksabmagar7 email?

[@fakharulislam2519]

Mention email plz

[@ksabmagar7]

@@fakharulislam2519 Please check the about section: kzbin.infoabout or message me in the page fb.com/ktmagarsYT