# Installing Rgdal

What follows are instructions to install `rgdal` for use within `R` 3.6.3, and `gdal` 3.0.4. The following commands will need to be run on one of our login nodes `wind` or `rain`.

In order to install `rgdal`:

1. 1. Load the `R`, `proj`, and `gdal` modules required for rgdal.

```bash
[abc123@wind ~]$ module load R/3.6.3 proj/6.1.0 gdal/3.0.4
```

2\. Export the `PKG_CONFIG_PATH` environment variable.

```bash
[abc123@wind ~]$ export PKG_CONFIG_PATH=/packages/PROJ/6.1.0/lib/pkgconfig
```

1. Start `R`.

```bash
[abc123@wind ~]$ R
```

1. Install the `rgdal` package.

```R
> install.packages(c('rgdal'),repos = "http://cran.case.edu", configure.args=c("--with-proj-include=/packages/PROJ/6.1.0/include","--with-proj-lib=/packages/PROJ/6.1.0/lib"))
```

## Troubleshooting

If you receive the `proj_create_crs_to_crs_from_pj` error, then you will need to force the installer to use an older version. This can be done inside an R shell by executing the following commands:

```R
> packageurl <- "https://cran.r-project.org/src/contrib/Archive/rgdal/rgdal_1.4-8.tar.gz"
> install.packages(packageurl, repos=NULL, type="source")
```

If you have any questions, please [contact us](<https://rcdata.nau.edu/hpcpub/docs-test/contact-us.html>).