How to Open a NetCDF File and Map the Data in R

[@jshullglobal]

I knew next to nothing about R last week, now I'm opening NetCDF files with it. Thank you!

[@Thinkingboutfrogggs]

Thank you SO much for uploading this video. I can't tell you how incredibly helpful it has been!!

[@shunrei1974]

Thank you very much for your video. When I want to plot the slice, I get "error in image.default(lon, lat, spei.slice) : increasing 'x' and 'y' values expected". Do you know why?

[@hammao]

A Big Thank You to you !!! ... You explained everything in the clearest way possible i must say.

[@hammao]

it will be nice if you can explain "dname" part of your code and how to export the data to CSV. do i just cbind the various variable ?

[@empowerdat2879]

thanks!

[@juliocgfreitas]

Great tutorial. Do you know if it's possible to plot how many grid points I'm using in my data? Thank you.

[@annadasankarroy1590]

Nice and very helpful video. Can you tell me how to take average of those time slices and get a long term average map of temperature for a particular region?

[@nicholastrandberg6346]

I am wondering the same thing about averages

[@dillibro]

how do you save the data into shape file, so that it can be used in ArcGIS?

[@thaa3092]

Thank you very helpful. If its possible please do a video with the basics. I'm new to all this

[@empowerdat2879]

Thanks for your comment! What kind of basics are we talking about? The basics of R, NetCDF files, or climate models? If you give me a better idea of what kind of project you're working on, I might be able to help.

[@liliansales9301]

Awesome video! Helped a lot! Thanks for the time!

[@emmanuelmawuliabalo4741]

This is a good video. Thanks very much. Could you please elaborate on mapCDF coding

[@empowerdat2879]

you can find all the code in this GitHub repository (github.com/angelamhkim/climateNetCDF) it's a bit of a mess but oh well

[@jonas9426]

Get error when imaging: "Error in image.default (lon, lat, kernel.slice [,, 1]): increasing 'x' and 'y' values expected " are there other imaging commands, that could work?

[@LarsOrWas]

Having the same issue. It seems we have to flip the chart anyhow to make sure, lon and lat are as they are supposed to. I'm searching for a solution and let you know if I do progress of some sort.

[@niranjanadhikari9124]

@@LarsOrWas I think either lat or lon is not in ascending order when you performed lat

[@vaishaliportel2410]

do you know how we can get mean and standard deviation plots using the data from nc file? urgent please help

[@PoLearnCo]

Can i plot the data just for a watershed.. I have a shapefile for this

[@y37chung]

What can I do when I run into an "Error: cannot allocate vector of size X Gb"? This happens on the line of variable_array creation

[@sunjingjing2002]

Thank you for sharing. I downloaded the netcdf data, it contains lat,lon, temp and time (days,from 1850-2100),1 I'd like to extract the data from 2100.01-2100.12 and calculated the month mean temp, how should I do? thank you

[@pan8054]

Can we convert NetCDF file to csv with R?

[@zarrinz1865]

Thanks a lot for your video, helps a lot. However, I stuck in a problem, Error: Package `maps` required for `map_data`. Please install and try again. Cou you please kindly help me out?

[@fahmibilal]

hello...i m getting the following error Error: Cannot add ggproto objects together. Did you forget to add this object to a ggplot object? plz help

[@ihssanmoin9980]

Thank you very much for this video!

[@engr.abdullahazzamsafi4515]

Thank you very much such a great video. Can you please do down-scaling/bais correction and extract a station data. please generate time series scenario projection of climatic data. thanking you in anticipation

[@pradeepattri8375]

thank you for this amazing video it was really helpful but please can you help me with the netcdf data with height levels, so for example if the data has different levels (z) so how can i select the z level?

[@empowerdat2879]

try looking at the attributes and dimensions. It should show you the into you need to figure out how to call the z (height) values.

[@user-gt5wx1hg1i]

Very cool, thank you very much!

[@ruchitripathi4204]

Hi, it was pretty useful, can you please tell me how to plot the data with a particular boundary? Say if I have data of only Alberta, how can I plot it on Alberta map? Please tag me while answering so that i receive notification. Thanks :)

[@hasbak07]

hello, thank you for sharing this video it was very helpful for me, for me I wanna focus on South Africa and map only the temperature of this slice of the world how I would do it? I have also data on precipitation levels, can I do the same manipulation for it or does it differ? Thank you

[@ruchitripathi4204]

Hey, did you get your answer? I also have somewhat same problem and I am stuck.

[@sudheerbhakare304]

It was very helpful. I am also trying some spatial plots, Can you provide that function used to get legend and country boundaries, because it is not visible in video.

[@muralikannansp2187]

I hope we have to use latitudinal and longitudinal values to fix the same. Am not sure

[@sandyherho1997]

Hi, Angela. I got this error message when I run mapCDFtemp function: Error in rename(., lon = Var1, lat = Var2) : could not find function "rename" could you tell why? Thanks

[@sandyherho1997]

I apologize, just a silly mistake, I forgot to import dplyr and readr.

[@estebanmeneses3107]

Thank you for the video! It was helpful, but what is unit on the "legend.key..." in the ggplot function? somebody know?

[@sudheerbhakare304]

It will be very nice if you make one video on how you wrote that function. thank you..

[@empowerdat2879]

hey! a bit of a mess but you can find the code in this GitHub repository github.com/angelamhkim/climateNetCDF

[@sudheerbhakare304]

@@empowerdat2879 Thank you. I got it.

[@KK-pf1ye]

I'm trying to run it but it's giving me a weird error. I'm using CMIP6 EC-Earth data for monthly precipitation values. It runs but then takes me to a different page and says "function (x, mode = "any") .Internal(as.vector(x, mode))" Please help

[@saisowmyakasula7888]

You are using CMIP6 data ??

[@jeffreymarak]

Very nice video, it was very helpful. Why dont you code using RStudio...It will be much easier for you.. and please keep making the videos. If possible pls do a video on how to extract trmm rainfall data from daily netcdf file for many years into a single excel file.

[@empowerdat2879]

Thanks! I started with RStudio but like the cleanliness of R :) I'm not familiar with trmm rainfall data but the same concepts should apply. I have a video that shows how to extract data from a specific lat/lon coordinate. That might be helpful.

[@jeffreymarak]

I saw the video it gave me idea on how to extract the data. But my problem is that I have extremely large number of files(around 7500 daily nc files). If there was a way to merge all 7500 files into one netcdf file my job would be a lot easier... :)

[@empowerdat2879]

divertido I'm sure we could write a function for that! Why don't you send me an email and we'll figure it out? You can reach me at [e-mail]

[@CapoeiraRecio]

This is awesome!!!! Thank you!

[@xilin7905]

Thanks a lots for making this video！ Its really helpful！

[@juanog88]

thanks for sharing

[@himanshupandey1410]

Thank you for the video it was great. I want to know how to extract data from a netcdf file and convert to excel sheet so I can visualize them. I'm comparing different model data with ground recorded data, I wanna know how can I convert netcdf file into excel

[@dr.barunbiswas7132]

Thank you for such a nice tutorial. Could you please provide some help regarding slicing a definite area using a particular shape-file of a country or state.

[@empowerdat2879]

Hey! Hmmm I’m not sure how to do that but I recommend looking up downscaled models.

[@ruchitripathi4204]

Hi. did you get your answer? I am also stuck with almost same problem .

[@emmanuelmawuliabalo4741]

So I run the ggplot code and I keep getting this message: "Error: Cannot add ggproto objects together. Did you forget to add this object to a ggplot object?" struggling to figure out what this means. Could you help out

[@muralikannansp2187]

download the package ggplot2 to avoid this error

[@saheedsalaudeen9141]

Thank you for this vedio. It is very useful but all the link could not be accessed

[@raularenasmunoz620]

what a nice video and what a nice explanation, thx a lot for your time

[@empowerdat2879]

That’s a very kind comment. Thank you!

[@edstewart2399]

Hi there! Thank you very much for the video I found it very useful. I am looking for data on a particular region: The European Alps to measure future snow depth. Would you have an idea of how to extract and map this data? any help would be amazing. Thank you in advance.

[@empowerdat2879]

you can set boundaries on the lat and lon variables to encompass only the area you are interested in

[@edstewart2399]

How would I do this? could I email you? Thank you in advance

[@modelynsanchez1540]

im just a newbie to netcdf files.. how can i access the dimension fields.. im having below error: > x1

[@empowerdat2879]

Hey! Maybe this video will help: kzbin.info/www/bejne/n52TZmtteM6BorM If not, let me know!

[@modelynsanchez1540]

Hi, thank you for ur reply, its not working. Previously the program is using ncdf package now upgrading to ncdf4. get.var.ncdf(ncin,"bottom_top") -> this one working using ncdf package ncvar_get(ncin,"bottom_top") -> this one after using ncdf4 package was not working. I have converted to below : ncdf ncdf4 ---------------------------------------------------------- open.ncdf -> nc_open get.var.ncdf -> ncvar_get dim.def.ncdf -> ncdim_def var.def.ncdf -> ncvar_def create.ncdf -> nc_create put.var.ncdf -> ncvar_put close.ncdf -> nc_close

[@levismuse]

helpful

[@MrJunaid136]

Please guide how to extract data from netcdf file using R. I want to extract data for my area of interest from global netcdf file.

[@empowerdat2879]

let me know if this helps kzbin.info/www/bejne/n52TZmtteM6BorM&ab_channel=EmpowerDat

[@farhansaleem7248]

I am waiting for you, thanks

[@empowerdat2879]

Hello Farhan! Is there a specific video you are looking for?

[@capsgurl22]

Thank you so much for this video! It has helped me a lot with mapping climate data in R. I am attempting to use the code with fill value 'NA', however, it creates an error due to using a discrete value on a continuous scale. Can I ask you about how to apply the code with 'NA's?

[@manacebationo8565]

Thanks for your helpful tutorial. Can you share the script? Thank you.

[@abiygebremichael8663]

plese send me procedure how to get/download/ 25km resolution downscaled climate data for 1950-2005 historical and 2006-2100 future from both NASA and CORDEX Thank you!

[@empowerdat2879]

Hello! Not sure how to do that... Do you have a link to your data sources in NASA and CORDEX? I can try to figure it out.

[@empowerdat2879]

hmm not sure how to do that but if I figure it out I'll make a video about it

[@jonathanopokuoti9688]

You can follow her previous video on how to download climate data on ESGF website. Use the same procedure to download forCORDEX. Under projects, select CORDEX.

[@ahmadfrahmand]

Dearest Kim, Thanks a lot for this nice video if its possible for you just guide me how to extract a specific lat, lon and start downscale. and what is need for downscaling process please can you help me in this regards?

[@ahmadfrahmand]

also please explain little bit about what is the difference between, RCP, Historical data, RCP85 and how to merge for example the CMCC-CM model the data from this model is based on year and if you download rcp85 its 100 file and how to merge it i don't know?

[@ahmadfrahmand]

and also please could you send me the codes you copied from suplim text editor?

[@ahmadfrahmand]

Dearest Kim, thanks for nice link i have to learn these things in another one month? could you please help me. can i have your email or skype to talk directly? please send me in my gmail . [e-mail]

[@ahmadfrahmand]

you did not make that video which is showing how to extract some specific lat and long dear kim.

[@empowerdat2879]

hey feel free to email me at [e-mail]

[@DeadrustyMeat]

This video is very helpfull. Thnks a lot, but I got a problem with some of the archives that I downloaded from the ESGF. Could you help me with my problem? CouldI write to your e-mail?

[@empowerdat2879]

Hello! No problem! Sure thing. Email me at [e-mail] and I'll get back to you as soon as I can.

[@franciscojavierbricenozulu2098]

How i can do a zoom in the map?

[@franciscojavierbricenozulu2098]

I mean, i just want to use a specific lon and lat

[@ahmedatia80]

good work, use Rstudio...

[@empowerdat2879]

thanks!

[@mohammedkareem6476]

hello i want clip net cdf

[@peterpauker3361]

Thanks for the video, great job!