Flood Area Extraction using Sentinel-1A in Google Earth Engine: A Powerful Tool for Flood Mapping

  Рет қаралды 20,027

Geomatics Engineering

Geomatics Engineering

Күн бұрын

Пікірлер: 65
@prabhatrajdahal6333
@prabhatrajdahal6333 3 күн бұрын
What an awesome tutorial! Thanks a lot. This helped me a lot in mapping flood in Nepal. Cheers!
@k4123
@k4123 10 ай бұрын
After learning from these videos, familiarity with using GEE is improving, thanks a LOT
@alamzeb3359
@alamzeb3359 3 ай бұрын
You are my teacher in GEE ❤
@sukanta_gis
@sukanta_gis Жыл бұрын
Nice video keep it didi, best of luck for you, i will share this videos into several groups,
@IvyKasote
@IvyKasote 4 ай бұрын
Wow! Easy to follow. Thank you for sharing
@ranjan3802
@ranjan3802 Жыл бұрын
As usual, It was so smooth and easy, Thanks a lot mam. 🙏
@anaclgarcez
@anaclgarcez 10 ай бұрын
Hi I am running the same script but I keep getting an error saying There are no bands to visualize, what could be the problem?
@ruhibasumata3101
@ruhibasumata3101 7 ай бұрын
Same here
@ngoanhtufns6956
@ngoanhtufns6956 8 ай бұрын
Cool! Thanks for your video.
@hidayatulil7893
@hidayatulil7893 Жыл бұрын
thank you very much, it's really helpful and easy to understand
@theleaf2215
@theleaf2215 8 ай бұрын
Very nicely done. Thank you
@eilifkurniadedadjamres2397
@eilifkurniadedadjamres2397 7 ай бұрын
thank you very much. your video is easy to follow
@Bkosky
@Bkosky 11 ай бұрын
What would you say the best way to test the accuracy of this flood map without having ground truth data. Comparing it to optical imagery?
@jaydipdey4615
@jaydipdey4615 Жыл бұрын
Di, you are doing a fantastic job! Thank you
@geomatics_engineering_sheelu
@geomatics_engineering_sheelu Жыл бұрын
Thanks a lot 😊
@FahadKhan469
@FahadKhan469 24 күн бұрын
Fantastic video!
@madhumitha501
@madhumitha501 11 ай бұрын
it will be helpfull maam if you share how to download shapefile for indian districts
@raiyans
@raiyans Жыл бұрын
Thanks a lot for the tutorial. Would you please tell me how can I remove the the area which is outside the AOI and not considered in the analysis? Once I import this flooded area geoTIFF in QGIS, it shows the black area outside the ROI. Thanks
@geomatics_engineering_sheelu
@geomatics_engineering_sheelu Жыл бұрын
You can simply reclassify it into 2 classes flooded and non flooded..and then from the reclassified layer extract the flooded layer in a sepearte tiff
@abd5239
@abd5239 10 ай бұрын
You can reclassify it in 2 classes or if you have boundary than clip on it ..
@abhinandanmaity9674
@abhinandanmaity9674 Жыл бұрын
Ma'am Please Make video on Crop Classification Map.
@ShivamkumarSingh-bm6bt
@ShivamkumarSingh-bm6bt 3 ай бұрын
Hi mam I need to extract flood and non flood point (giving flood as 1 and non flood point as 0 to import it into Machine Learning) How can it be done? Please reply From Nepal
@The_Abhi_abhishek
@The_Abhi_abhishek 8 ай бұрын
VH should be used for floods?
@suryakantgupta5483
@suryakantgupta5483 Жыл бұрын
Mam I am using the same code for the trial.......but when I run it , I found error like .....before.clip is not a function but in your video it runs without error ....please suggest the suitable changes
@neveralwaysbelose
@neveralwaysbelose Жыл бұрын
same question
@mariolago7664
@mariolago7664 6 ай бұрын
Most probably there is something wrong when you created the var before = ..etc In my particular case I was missing the () after mosaic, then it worked
@ashokthakur5765
@ashokthakur5765 Жыл бұрын
You are amazing thankyou som much keep it up ma'am..🙏
@geomatics_engineering_sheelu
@geomatics_engineering_sheelu Жыл бұрын
Most welcome 😊
@mtkavak
@mtkavak 10 ай бұрын
Thank you very much
@unworldlyimran4525
@unworldlyimran4525 Жыл бұрын
Why difference (
@geomatics_engineering_sheelu
@geomatics_engineering_sheelu Жыл бұрын
This value is totally based on trial and error method, based on my AOI, it can be different for any other location.
@dhiazahira6846
@dhiazahira6846 Жыл бұрын
Hello@@geomatics_engineering_sheelu, first of all thanks on your video tutorial, it was fantastic. But I wanna ask about the difference value. You said that the value is based on trial and error method on your AOI. How can I get the value to my AOI with that trial and error. What should I do, please help me. Thanks in advance
@MuhammadIsmail-n8n
@MuhammadIsmail-n8n Жыл бұрын
hello dear can i have a quick reply when I export this data to drive and download its just black image nothing more what should I do.
@geomatics_engineering_sheelu
@geomatics_engineering_sheelu Жыл бұрын
Try to apply histogram stretching over the black image
@madhumitha501
@madhumitha501 10 ай бұрын
How to validate the accuracy of the output maam? please reply
@donugift9144
@donugift9144 Жыл бұрын
Great job. What is the rationale behind the values you have used like the difference of -3 used in the methodology section kindly explain why those values. Thanks
@geomatics_engineering_sheelu
@geomatics_engineering_sheelu Жыл бұрын
This value is based on trial and error...after after analyzing the flooded area pixel values
@donugift9144
@donugift9144 Жыл бұрын
Great, thanks for your response. Does this mean there is a difference between the pixel values of flooded and non-flooded area and based on this -3 was selected probably as the mean value to represent flooded area, in the case of your study area.
@donugift9144
@donugift9144 Жыл бұрын
I am asking because a change in the value of the difference can affect the area delineated as flood. How to know -3 is the right value in your case. How is the trial and error done?
@aqsazahid9810
@aqsazahid9810 2 ай бұрын
@@donugift9144 I have the same question? how should we adjust this value based on our area of analysis?
@tharjun9447
@tharjun9447 4 ай бұрын
mam why you use minus 3 pls reply
@afshinj4836
@afshinj4836 Жыл бұрын
Thank you very much. How can I access the GEE code for this tutorial?
@koushikbanerjee4783
@koushikbanerjee4783 8 ай бұрын
Mam, I did the same for the whole of Bihar, however, when I am trying to export the final flood layer it is showing that the request payload size exceeds the limit,,, how to solve the issue mam.
@tharjun9447
@tharjun9447 4 ай бұрын
hi bro mine is having problem can you pls help me
@mohamedyhia766
@mohamedyhia766 5 ай бұрын
It gave me this error: flood: Layer error: Image.lt: If one image has no bands, the other must also have no bands. Got 0 and 1.
@Learnywise
@Learnywise 8 ай бұрын
unable to pass through filterBounds('aoi');
@SRL-fp3ww
@SRL-fp3ww Жыл бұрын
Maam in ArcGIS it's showing black In value both 1/1what should I do??
@geomatics_engineering_sheelu
@geomatics_engineering_sheelu Жыл бұрын
Try to apply histogram stretching over the Black tiff images.
@ManishKumar-b1k7o
@ManishKumar-b1k7o 11 ай бұрын
how to do that @@geomatics_engineering_sheelu
@azkiarizqi1577
@azkiarizqi1577 11 ай бұрын
Did you solve this problem? would you like to share it please
@ramshaharis2020
@ramshaharis2020 10 ай бұрын
How to convert SAR image to vector?? In GEE
@kuldeepsinghkushwaha6621
@kuldeepsinghkushwaha6621 Жыл бұрын
👍 please make video on concept of coding in GEE because many times when we apply function in bataset and running then showing error "this is not function for dataset"
@geomatics_engineering_sheelu
@geomatics_engineering_sheelu Жыл бұрын
In earth engine most of the functions works on a single image...and not on an image collection ...that's why this error came up.
@ekvinaysayaraj6071
@ekvinaysayaraj6071 Жыл бұрын
If the flood is started at night dark. Can the image show of the flood?
@noornaeem866
@noornaeem866 Жыл бұрын
Yes. Sentinal works on active sensing
@TechFacts-Muh
@TechFacts-Muh Жыл бұрын
Can we calculate how much the area affected by flood?
@geomatics_engineering_sheelu
@geomatics_engineering_sheelu Жыл бұрын
yes you can calculate, there are function available for these kind of calculation in GEE
@saadibrahim7119
@saadibrahim7119 11 ай бұрын
Could you please provide the script?
@boubacarley-balladiallo1659
@boubacarley-balladiallo1659 6 ай бұрын
Good Morning, Could you provide the code please?
@afshinj4836
@afshinj4836 Жыл бұрын
Thank you so much. Would you please share the code?
@muhmmmadsulaiman946
@muhmmmadsulaiman946 4 ай бұрын
I NEED A CODE FOR FLOOD MAPPING
@legendkiller5118
@legendkiller5118 6 ай бұрын
Mam please provide shape file
@user-oq1bj5rv6i
@user-oq1bj5rv6i 5 ай бұрын
thank you so much
@GISHacks
@GISHacks 8 ай бұрын
Thank you so much. Would you please share the code?
@jadhavmadhav
@jadhavmadhav 2 ай бұрын
Thank you very much
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