will u please tell in what format of Seninel 3 data set is?

Sentinet 3 SLSTR data (****_radiance.nc).

Thank you Jan

Dear @Tea =D

your question can  solve by two different approaches.

if you know about arc gis there is tutorial video is available which tells you how to import .nc files in that software

https://www.youtube.com/watch?v=LNip6D7Jzxw

If you use Matlab version above than 2012, you can use the commands

ncdisp and ncread. With the command ncdisp you can obtain information about the file (attributes, variables, dimensions, units, etc.). And with the command ncread you can extract data for a given variable.

Otherwise, if you use R, there is a netcdf package (http://cran.r-project.org/web/packages/RNetCDF/index.html). Then, I think the commands to use would be file.inq.nc and var.get.nc. (NB: I haven't used it so I cannot give you advice about it).

I show you an example using Matlab. I downloaded the file 'pr_day_CNRM-CM5_rcp45_r1i1p1_20260101-20301231.nc' from the project CMIP5 (precipitation in 2026-2030 according to the RCP4.5 scenario and CNRM-CM5 model).

I save the file name

>> file = 'pr_day_CNRM-CM5_rcp45_r1i1p1_20260101-20301231.nc';

Then, to display the file properties:

>> ncdisp(file)

Then you can know that the variables you are interested in are coded as lat (latitude), lon (longitude), time (time), and pr (precipitation). lat is a 128x1 vector, lon is a 256x1 vector, and time is a 1826x1 vector and pr is a 256x128x1826 array with the dimensions lon, lat, time.

With the following commands you can extract the longitude, latitude and time values of all the grid points:

>> longitude = ncread(file,'lon');

>> latitude = ncread(file,'lat');

>> time = ncread(file,'time');

You can use the same instruction (with some additional input arguments) to extract precipitation data for a selection of coordinates and times:

vardata = ncread(source,varname,start,count,stride)

source is the file name

varname is the variable name

start is from where you want to start to read data for each dimension (in vector form)

count is how many data points do you want to read for each dimension (in vector form)

stride is the frequency of extraction data, i.e. each day, each two days, etc. (in vector form)

So, if you want to extract precipitation every day for the full period 2026-2030 between latitudes 39.9218ºN and 52.5286ºN, and between longitudes 0º and 11.25ºE you would have to type:

Precip = ncread(file,'pr',[1 93 1], [9 10 Inf], [1 1 1]);

[1 93 1] is start, since longitude(1) = 0, latitude(93) = 39.9218, and you start at the first time measurement

[9 10 Inf] is count, since you want to extract data for 9 longitudes (longitude(9) = 11.25), for 10 latitudes (latitude(102) = 52.5286), and you use Inf to indicate you want all time points

[1 1 1] is stride, since you want to extract each longitude point, each latitude point and each time point

I hope this helps.

Usman

Thank you Muhammad

http://web-facstaff.sas.upenn.edu/~dromano/classes/gis/files/Getting_Started_with_ArcGIS.pdf