albedo_map file [variable_name]Here file is the location of the netCDF file, The optional argument allows the name of the albedo variable in the netCDF file to be specified (the default name is AL). The albedo must be provided as function of latitude and longitude AL(lat, lon), and may also depend on time AL(time, lat, lon). The latitude, longitude, and time grids must be provided as doubles double lat(lat), double lon(lon), and double time(time). uvspec reads the value at the nearest pixel to the given latitude and longitude. No spatial interpolation or averaging of the values are performed. If a time-dependent albedo is provided, the albedo data nearest to the specified time will be selected (or linear interpolated if time_interpolate is switched on).