CDO

I'm currently facing a challenge with using the remapbil command in CDO for bilinear interpolation from grid data to specific stations. Despite following the standard format for the lonlat.txt file, I keep encountering a Namelist error.

Here’s the CDO command I’m using:

cdo remapbil,/path/to/lonlat.txt /path/to/input_data.nc /path/to/output_data.nc

My goal is to interpolate grid data onto specific station points defined in the lonlat.txt file. The file contains pairs of longitude and latitude coordinates, formatted as follows:

-54.6216666 -25.9183
-58.43777777 -27.6666666666667
-60.6948 -32.8269
...
Each line in the file represents a station with a pair of longitude and latitude values, separated by a space. The file is an ASCII text file and uses Unix-style line endings (\n).

I have checked for any hidden or unusual characters using the cat -A command, and it appears that the file is free from such anomalies. Here is an example output from cat -A:

-54.6216666 -25.9183$
-58.43777777 -27.6666666666667$
-60.6948 -32.8269$
...
I'm running this on an Ubuntu system. Could you provide any insight into what might be causing the Namelist error? Any advice or suggestions on how to successfully perform this grid-to-station bilinear interpolation would be greatly appreciated.

Thank you in advance for your help!