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Regarding Regridding/Remapping

Added by Harsh Vardhan Singh about 4 years ago

I am using Remapbil function to regrid 1 Degree IMD Temperature file (MaxT_1951_2016.nc) to 0.5 Degree temperature file using following command :

cdo remapbil,grids.txt MaxT_1951_2016.nc Output.nc

I am getting various missing values in various grids, how it can be done so that I could get right result?
Is there any other way to regrid or remap the file so that proper result could be obtained?
I have attached picture that how data gap is there. Many grids have missing values.

Grid Information for my Input file MaxT_1951_2016.nc is as follows: #
  1. gridID 1 #
    gridtype = lonlat
    gridsize = 961
    xsize = 31
    ysize = 31
    xname = lon
    xlongname = "longitude"
    xunits = "degrees_east"
    yname = lat
    ylongname = "latitude"
    yunits = "degrees_north"
    xfirst = 67.5
    xinc = 1
    yfirst = 7.5
    yinc = 1
Grid Information of Output file (Output.nc) is as follows: #
  1. gridID 1 #
    gridtype = lonlat
    gridsize = 3844
    xsize = 62
    ysize = 62
    xname = lon
    xlongname = "longitude"
    xunits = "degrees_east"
    yname = lat
    ylongname = "latitude"
    yunits = "degrees_north"
    xfirst = 67.5
    xinc = 1
    yfirst = 7.5
    yinc = 1
dfdd.png (320 KB) dfdd.png

Replies (4)

RE: Regarding Regridding/Remapping - Added by Karin Meier-Fleischer about 4 years ago

Hi Harsh,

the gridfile for the output file is not correct. The xinc and yinc should be 0.5 if you want to remap to a 0.5x0.5 grid. The missing values come from the grid cells outside your input data.
You can see the grid information with 'cdo sinfo Outfile.nc'.

-Karin

RE: Regarding Regridding/Remapping - Added by Harsh Vardhan Singh about 4 years ago

Thank you, but here it was written by mistake. I have already used xinc and yinc as 0.5, result is very bad.
Can you please help me regarding this?

RE: Regarding Regridding/Remapping - Added by Karin Meier-Fleischer about 4 years ago

Please, upload your input file? It is not possible to help without it.

RE: Regarding Regridding/Remapping - Added by Harsh Vardhan Singh about 4 years ago

Here I am attaching the Max Temperature file which is in 1 Degree and I want to regrid on the 0.5 Degree resolution.
Problem is that when I am extracting data in the format of CSV or excel there comes a lot of data gap. Kindly solve the problem.
The grids falling in my area are also attached in excel file.

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