Calculating Rainfall Deviation - Part3 (Earth Engine Guided Project)

[@nandiniray8749]

This should have been much higher in the list of KZbin videos. It would've saved me half a month.

[@abheebandary190]

you are absolutely true sis

[@phanidevarakonda]

Amen to that! haha

[@puspendubiswaspaul6965]

Thank you sir, Very helpful course

[@Go2vagabond]

I'm glad to watch your lecture

[@algesemi]

Very nice channel and thanks fro the tutorial. I need to extract the monthly average of number of rainy days per month. Thanks if you have a hint

[@SpatialThoughts]

Here's a script showing how to calculate number of rainy days code.earthengine.google.co.in/4e1e50d8462ecdd4a4521ca53b60a8d0 (It used IMD data, but the same process canbe applied to any other precipitation dataset.

[@raiyans]

Hello Thanks for your tutorial. It is so structured and helpful. I would like to generate a chat of the monthly total (for any specific month, for example: January) over the 30 years period. So X-axis will be the specific month (30 values for January) and Y-axis will be the precipitation value. How could I do that? thank you for your reply.

[@SpatialThoughts]

The key is using the .filter(ee.Filter.calandarRange()) function. Implemented this in code. code.earthengine.google.com/54fe66129733e0cd1887479126f99b02

[@sugandhchauhan1900]

In case I am using the VH backscatter instead of the rainfall, do I still need to implement the first loop that is calculating the sum for each month? Coz I am only interested in the average backscatter image for the "LPA" period that can be compared with the "Observed" period.

[@kavyaagrawal9405]

The code is empty in the link, can you please update it?

[@hajarchoukrani]

Thanks for the video. I tried to apply the script on my area of interest and I got this message: "Image.reduceRegion: Too many pixels in the region." How can I fix it? thanks in advance

[@SpatialThoughts]

Increase the scale (try 10000) or reduce the size of the area you are trying to compute average over. If you really must chart average over a very large area, you have to export the results as CSV and create the chart outside of GEE. using reduceRegions() function. See this post on how to do it spatialthoughts.com/2020/04/13/extracting-time-series-ee/

[@hajarchoukrani]

@@SpatialThoughts I just did but got this message: No features contain non-null values of "system:time_start".

[@SpatialThoughts]

Please share your code by clicking “Get Link” button to help further

[@hajarchoukrani]

@@SpatialThoughts Could you please tell me what is wrong with the code, If you have checked it. Thank you in advance.

[@yogitakarpate2003]

My script worked fine for the first time but throws errors when I am executing it later. Can you suggest a fix?

[@ujavalgandhi5794]

Save the script, refresh your browser tab and run again. If you still get an error, look up the error in the debugging guide developers.google.com/earth-engine/guides/debugging If you can't resolve, post your script link using the 'Get Link' button and will take a look.

[@yogitakarpate2003]

@@ujavalgandhi5794 Thanks for your reply. I could fix the error by refreshing the code. But still, I am not able to generate the chart. I am selecting a random region on the map by drawing a rectangle. I tried changing the region but it didn't help. It gives an error that "no images in the collection intersect the specified regions."

[@ujavalgandhi5794]

@@yogitakarpate2003 Your error is self-explanatory. You don't have images where you are drawing the random region. Add your collection to the map and check visually where your images are. Also remove any ee.Filter.bounds() that maybe filtering out images based on a specific region.

[@yogitakarpate2003]

@@ujavalgandhi5794 Thanks Ujaval, your suggestions helped me a lot. I am trying to find shapefiles online. Can you please suggest an online source from where I can download the data for free?

[@sugandhchauhan1900]

Strangely I am getting an error "Error generating chart: No images in the collection intersect the specified regions." while charting the mean values.

[@SpatialThoughts]

Script 3b is the complete script that works fine. Try changing your region in that script. If you can't fix the error, share your script using 'Get Link' and make sure your assets are set to 'Anyone can read' so I can see what's wrong.

[@sugandhchauhan1900]

@@SpatialThoughts code.earthengine.google.com/1e551747a0c5341002e6594841a6fa84

[@SpatialThoughts]

@@sugandhchauhan1900 Apparently some months in 2015 result in 0 images after filtering. Changing the start year to 2016 fixes the problem. code.earthengine.google.com/01c6ba2610be9833f198039846f60ae5

[@sugandhchauhan1900]

@@SpatialThoughts Thank you. :) Instead of calculating the monthly average, how can I calculate the average every 12 days? Since the Sentinel-1 data is available every 6-12 days?

[@SpatialThoughts]

@@sugandhchauhan1900 Create a list sequence for every 12 days ee.List.sequence(1, 365, 12), and when you map() over it , use 'day_of_year' in calendarRange().