Compile and install GDAL-GRASS plugin

The idea of the GDAL-GRASS plugin is to directly access GRASS raster and vector data from outside. Any GDAL enabled software (QGIS, R, ...) can read and write through the plugin from the GRASS database. It is sufficient to indicate the full path to the GRASS dataset (see below).

The compilation order should be kept due to inter-dependencies between the packages. Please keep the order as seen below. GRASS compilation is explained in Compile and Install.

Compilation and Installation of Prerequisites

The install order should be kept due to inter-dependencies between the packages. Please keep the order or install all in a single step:

1. PROJ4 with Datum grids file proj-datumgrid-1.X.zip (expand in nad/ subdirectory before compiling PROJ)
2. Optional: GEOS
3. Optional: PostgreSQL, mySQL, unixODBC, SQLite (SQLite is needed for QGIS)
4. GDAL/OGR compiled without GRASS support (because we use the plugin!)

Compilation and Installation of the GDAL-GRASS plugin

For GRASS GIS 7:

Get the GDAL/OGR-GRASS 7 plugin - file: gdal-grass-2.4.0.tar.gz (or later)

1. NOTE: the plugin needs to "see" the GRASS GIS libraries. The best way is to add a file 'grass7.conf' into the directory /etc/ld.so.conf.d/ (edit as root) which contains the path to the GRASS libraries; then run 'ldconfig'.

Available binary packages

• Debian: https://packages.debian.org/source/stretch/libgdal-grass
• Fedora: https://copr.fedorainfracloud.org/coprs/neteler/gdal-grass-plugin/
• openSuSe: https://build.opensuse.org/package/show/Application:Geo/libgdal-grass
• Ubuntu: https://packages.ubuntu.com/bionic/libgdal-grass

Usage of the plugin

You always need to specify the full path to the data set:

• GRASS raster map:

gdalinfo /path/to/grassdata/spearfish60/PERMANENT/cellhd/aspect

• GRASS vector map:

ogrinfo -ro -so /path/to/grassdata/spearfish60/PERMANENT/vector/roads/head

• Mapserver: should see both raster and vector maps, define connection properly in the .map file
• Geoserver: probably via GDAL support
• QGIS: only needs it for raster data
• OpenSceneGraph

GRASS GIS 7 support

Download the source code of the plugin with GRASS GIS 7 support (check there for any later version):

 http://download.osgeo.org/gdal/2.4.3/gdal-grass-2.4.3.tar.gz

Troubleshooting

All stuff installed but QGIS doesn't see GRASS or r.out.gdal doesn't work?

• Check if GDAL finds the plugin:

        gdal_translate --formats | grep -i grass
        GRASS (ro): GRASS Database Rasters (5.7+)

• Check if the GRASS libs are found by the plugin. All libraries should be found (maybe you forgot to run 'ldconfig' if you didn't install from RPMs?):

        ldd /usr/lib/gdalplugins/gdal_GRASS.so
        ldd /usr/lib/gdalplugins/ogr_GRASS.so

If not, create as root user the file "/etc/ld.so.conf.d/grass6.conf" with this line (modify path as needed):

        /usr/grass-7.4.3/lib/

Then run "ldconfig" as root user.

Still failing ?

• Check if the GRASS plugins are in the right directory (check the 'Auto register' directory reported in the output):

        # remember that you have to specify the absolute path:
        export CPL_DEBUG=on
        gdalinfo $HOME/grassdata/spearfish60/PERMANENT/cellhd/roads
        ogrinfo -summary $HOME/grassdata/spearfish60/PERMANENT/vector/roads/head

ERROR 1: libgrass_I.so: cannot open shared object file: No such file or directory

The path to "libgrass_I.so" is missing from LD_LIBRARY_PATH. To solve this, create as root user the file "/etc/ld.so.conf.d/grass6.conf" with this line (modify path as needed):

        /usr/grass-7.4.3/lib/

Then run "ldconfig" as root user.

Further Instructions

If you are still having trouble, please also visit "GRASS for Fedora Core 4" for more detailed GRASS and GDAL compilation and installation instructions developed by Isaac Ullah for Fedora Core 4.

There are good instructions on source code compiling here http://casoilresource.lawr.ucdavis.edu/drupal/node/123