Short Introduction to Geostatistical and Spatial Data Analysis with GRASS 6 and R statistical data language

Software

R-stats and the R/GRASS6 interface are separate packages:

• "R" statistical language itself is a base package with many optional contributed packages.
• The GRASS/R interface is a extra package for R available from the r-spatial project (available package list).

Installation of R and R/GRASS geostatistics interface

I) First install R itself, check out the R FAQ for details.

II) We install directly from the Internet:

#start R or R-GUI:
R

# you need to be connected to the Internet to use these commands:


##### Non-Mac users:
install.packages("spgrass6", dependencies = TRUE)

##### Mac users:
install.packages("spgrass6", type="source", dependencies=TRUE)

update.packages()

Usage

grass64

...

R
library(spgrass6)
# this will load some required packages...
G <- gmeta6()

#start the local help system in a Web browser (e.g., look at Packages -> 'spgrass6'):
help.start()

Since the GRASS/R interface completely changed for GRASS 6, we recommend to first read

• GRASS News vol.3, June 2005 (R. Bivand. Interfacing GRASS 6 and R. GRASS Newsletter, 3:11-16, June 2005. ISSN 1614-8746)
• Bivand, R. 2007. Using the R-GRASS interface. OSGeo Journal 1, 36-38