READING CDF FILES SOFTWARE

Does this mean that latitude and longitude have the same contents, which is longitude and latitude values of the whole file? Thanks again. attr(*, 'class')= chr 'ncdim4'Īlso, in my initial question, when I try to get 'latitude' and 'longitude' values from the initial netcdf file, they both have two dimensions (720, 360). $ format : chr 'NC_FORMAT_NETCDF4_CLASSIC' What does it mean? $ filename : chr 'wfd-land-lat-lon-z.nc' I opened this latter file and used str() on the resultant object, and got the following explanation. I found out that there is another netcdf file contains 'land'. I think we really need to see some of the values of the land dimension to figure out what's happening here.Ĭan you please open the land variable with nc_open() and then run str() on the resultant object? And maybe run off a histogram too, if it's a vector. That said, 360x720 is 259 200, not 67 420 (although your output does mention a mask, do maybe the mask is stored in the file and land is the precipitation in grid cells over land only). Mashing two dimensions into one definitely isn't CF-compliant! Typically I would expect to see latitude and longitude dimensions whose values take on the late/lon values for the grid.

READING CDF FILES SOFTWARE

I should say here that most NetCDF visualisation software ( NCview, Panoply, etc.) is built to take in CF-compliant NetCDF files. With a half-degree grid, 360 values in y and 720 in x sounds like your grid. I think we're gonna need to take a closer look at some of the values in these variables. Hi Sounds like you have a pretty interesting NetCDF on your hands When I try to get latitude and longitude separately, they each have two dimensions, 'x' or longitude -720 rows and 'y' or latitude -360 columns.

Note2: land mask in file: WFD-land-lat-long-z.ncįor example, if I want to extract data for a specific area: latitude (25 to 45 degree north), longitude (34 to 52 degree west), which rows of data should I consider? Currently, when using ncvar_get() function to get the precipitation data, it has two dimensions, 'land' -67420 rows and 'tstep' -31 columns. I don't know if the land is row-wise or column-wise from latitude and longitude alone? I can not attach the netcdf file, but I copy the relevant description here. The 'land' is latitude-longitude combination every half-degree spacing, while the 'tstep' is day ID (which is from 1 to 31). For example, when reading precipitation data, there are two dimensions: 'land' and 'tstep'. I tried to read precipitation, latitude and longitude data, but could not get it. This is a netcdf file with daily precipitation data in January over the globe.

Reading cdf files