ncmeta

Straightforward NetCDF metadata for use in building interfaces to this format.

Installation

You can install ncmeta from github with:

# install.packages("devtools")
devtools::install_github("hypertidy/ncmeta")

Example

This is a basic example which shows you how to solve a common problem:

nc_inq(filename) # one-row summary of file

nc_dim(filename, 0)  ## first dimesion
nc_dims(filename)  ## all dimensions

Compare timings.

library(ncmeta)
f <- system.file("extdata", "S2008001.L3m_DAY_CHL_chlor_a_9km.nc", package = "ncmeta")
u <- "https://upwell.pfeg.noaa.gov/erddap/tabledap/FRDCPSTrawlLHHaulCatch"

library(microbenchmark)
junk <- capture.output(a <- microbenchmark(nc_open = ncdf4::nc_open(f), 
               ncdump = ncdump::NetCDF(f), 
               ncmeta = nc_meta(f) ,
               RNetCDF = RNetCDF::print.nc(RNetCDF::open.nc(f)), 
                times = 10)
)
print(a)
#> Unit: milliseconds
#>     expr      min       lq      mean    median        uq       max neval
#>  nc_open 14.15938 14.23332 112.95724  14.98906  21.33014 656.46713    10
#>   ncdump 93.73832 95.89619 134.31769 101.12352 107.68589 370.77173    10
#>   ncmeta 59.67635 61.19443  62.97108  61.91249  62.57958  70.01173    10
#>  RNetCDF 32.97361 33.77285  52.62526  35.87184  40.15188 135.59934    10