问题描述
是否有解决 ncdf4::nc_open 无法从 URL 访问某些 .nc 文件的问题的解决方法？我想避免必须先下载文件，因为这是针对部署在服务器上的闪亮应用程序，因此我想避免用户能够将文件下载到服务器。
某些网址有效，例如来自 THREDDS 服务器的这个 OPeNDAP URL：
library(ncdf4)
nc <- nc_open("https://dapds00.nci.org.au/thredds/dodsC/uc0/Test_pixel_count.nc")
但其他人没有，例如这个来自 THREDDS 服务器的 NetCDF 子集服务 URL：
nc <- nc_open("https://dapds00.nci.org.au/thredds/ncss/uc0/Test_pixel_count.nc?var=Band1&north=-22.9556&west=142&east=143&south=-25.0706&disableProjSubset=on&horizStride=1")
# Error in nc_open("https://dapds00.nci.org.au/thredds/ncss/uc0/Test_pixel_count.nc?var=Band1&north=-22.9556&west=142&east=143&south=-25.0706&disableProjSubset=on&horizStride=1") :
# Error in nc_open trying to open file https://dapds00.nci.org.au/thredds/ncss/uc0/Test_pixel_count.nc?var=Band1&north=-22.9556&west=142&east=143&south=-25.0706&disableProjSubset=on&horizStride=1
或直接来自网站的此文件：
nc <- nc_open("https://www.unidata.ucar.edu/software/netcdf/examples/ECMWF_ERA-40_subset.nc")
# Syntax error,unexpected WORD_WORD,expecting SCAN_ATTR or SCAN_DATASET or SCAN_ERROR
# context: <!DOCTYPE^ HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"><html><head><title>404 Not Found</title></head><body><h1>Not Found</h1><p>The requested URL was not found on this server.</p></body></html>
# Error in R_nc4_open: NetCDF: file not found
# Error in nc_open("https://www.unidata.ucar.edu/software/netcdf/examples/ECMWF_ERA-40_subset.nc") :
# Error in nc_open trying to open file https://www.unidata.ucar.edu/software/netcdf/examples/ECMWF_ERA-40_subset.nc
有些方法有效而有些方法无效的原因可能是什么，有什么方法可以解决这个问题？
解决方法
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