my problem is that I have a NETCDF4 file with a lot of temperature data in the tas variable. I can extract a couple of temperature data and find the closest point of lon and lat in the grid. The problem is that the grid has a lot of data with — in there, where there stands nothing, how can I find only points with availible temperature data in there. Is there maybe even a function for that in the nc library or do I have to work even more on my workaraond ?