目前我可以使用 rgdal 在 R 中读取 grib 文件，但我真的不知道这个文件包含的波段的名称是什么。例如，下面是我正在使用的 grib 数据。
library(rgdal)
library(sp)
fname = "GLDAS_NOAH025SUBP_3H.A2016091.2100.001.2016099220519.grb"
gribdata = readGDAL(fname)
summary(gribdata)
band01 = gribdata@data[[1]]
band28 = gribdata@data[[28]]
dim(band01) = c(1440,600)
dim(band28) = c(1440,600)
我可以阅读第一和第二十八频段；但我不知道这些波段是什么（哪些参数）。
“摘要”功能也无济于事。你能帮忙吗，我如何知道这个文件包含的乐队的名字？
Parameters:
Water Balance parameters
086: Average layer soil moisture (# layers: CLM, 10; Mosaic, 3; Noah, 4; VIC, 3)
065: Snow water equivalent
071: Total canopy water storage
132: Rainfall rate
131: Snowfall rate
099: Snowmelt
235: Surface runoff
234: Subsurface runoff
057: Total evapotranspiration
Energy Balance parameters
111: Net shortwave radiation
112: Net longwave radiation
122: Sensible heat flux
121: Latent heat flux
155: Ground heat flux
138: Average surface temperature
085: Average layer soil temperature (# layers: CLM, 10; Noah, 4)
Forcing parameters
204: Surface incident shortwave radiation
205: Surface incident longwave radiation
011: Near surface air temperature
051: Near surface specific humidity
032: Near surface wind magnitude
001: Surface pressure
132: Rainfall rate (included in Water Balance)
131: Snowfall rate (included in Water Balance)
Static parameters
Elevation
Dominant vegetation type
Soil sand fraction
Soil silt fraction
Soil clay fraction