R 在打开 netcdf 文件时崩溃

Question

我下载了一个 netcdf 文件并尝试在 R 中打开它。这是我的代码

download.file("https://data.giss.nasa.gov/impacts/agmipcf/agmerra/AgMERRA_1980_prate.nc4",destfile = "AgMERRA_1980_prate.nc4", method="libcurl")

我想用R打开netcdf文件

library(ncdf4)
my.file <- nc_open("AgMERRA_1980_prate.nc4")

但是，每次我这样做时，R 都会崩溃。

是我的代码有问题还是R studio有问题？

sessionInfo() R version 3.5.0 (2018-04-23) Platform: x86_64-w64-mingw32/x64 (64-bit) Running under: Windows 7 x64 (build 7601) Service Pack 1

矩阵产品：默认

编辑

如果我手动下载文件，我可以打开它。所以我下载它的方式肯定有问题。有什么建议吗？

Answer 1

我不确定这里发生了什么，可能是 windows 具体的。我尝试在没有参数 method="libcurl" 的情况下下载，它似乎有效。

download.file("https://data.giss.nasa.gov/impacts/agmipcf/agmerra/AgMERRA_1980_prate.nc4",
destfile = "AgMERRA_1980_prate.nc4")



library(ncdf4)
my.file <- nc_open("AgMERRA_1980_prate.nc4")


File AgMERRA_1980_prate.nc4 (NC_FORMAT_NETCDF4):

     1 variables (excluding dimension variables):
        short prate[longitude,latitude,time]   (Chunking: [1440,720,1])  (Compression: level 9)
            _FillValue: 32767
            description: Precipitation Rate
            units: mm/day
            add_offset: 0
            scale_factor: 0.100000001490116
            vMin_original_data: 0
            vMax_original_data: 457.399993896484
            vRange: 457.399993896484

     3 dimensions:
        time  Size:366   *** is unlimited ***
            units: days since 1980 01-01-01 12:00:00
        latitude  Size:720
            units: degrees_north
        longitude  Size:1440
            units: degrees_east

    4 global attributes:
        history: Tue Aug 12 16:42:13 EDT 2014
        source: AgMIP / Alex Ruane
        title: AgMERRA v1.1 Precipitation Rate
        center: NASA GISS

我的会话信息 -

R version 3.5.0 (2018-04-23)
Platform: x86_64-apple-darwin15.6.0 (64-bit)
Running under: macOS High Sierra 10.13.6

Answer 2

我怀疑这个问题与 Downloading NetCDF files with R: Manually works, download.file produces error. @Luis's suggestion there of using mode = "wb" rather than the default of mode = "w" was successful in avoiding nc_open() crashes for me with R 4.0.2, RStudio 1.3.959, and ncdf 1.17. wb tells download.file() 重复，将文件视为二进制文件，与 netCDF 格式一致。

对于此处感兴趣的数据，它将是

download.file("https://data.giss.nasa.gov/impacts/agmipcf/agmerra/AgMERRA_1980_prate.nc4", destfile = "AgMERRA_1980_prate.nc4", method = "libcurl", mode = "wb")

R 在打开 netcdf 文件时崩溃

R crashes while opening netcdf file

r

raster

netcdf4