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BLOSC Support

Functions that access Copernicus Marine raster files stored in the ZARR format (cms_download_subset() and cms_zarr_proxy()) generally require BLOSC decompression. This package uses the features provided by the GDAL library as ported by the sf package.

Not all sf builds come with BLOSC support. If you receive an error about missing BLOSC support, you need to reinstall sf with BLOSC. Below you will find instructions to get BLOSC support on your OS.

Windows

The tool chain for building R packages on Windows includes BLOSC support by default. You just need to install the latest version of sf from CRAN. If this doesn’t work, you can build sf from source with RTools >= 4.5.

MacOS

On MacOS you can build the sf package from source, but ensure that you have the GDAL library installed first using the homebrew formula (which contains BLOSC support)

brew install pkg-config
brew install gdal

install.packages("sf", type = "source", configure.args = "--with-proj-lib=$(brew --prefix)/lib/")

Debian (and alike)

First run:

sudo apt-get install libblosc-dev

Then reinstall sf to make sure it compiles with BLOSC support

Fedora (and alike)

First run:

sudo yum install blosc-devel

Then reinstall sf to make sure it compiles with BLOSC support

These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.
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