Tag Archives: scripting

Start R inside GRASS but keep the terminal prompt

Posted on June 17, 2011 by

I often run R from within GRASS GIS. For example using R as a scripting language to automate GIS analysis. Or to use statistical models in R on spatial data in GRASS. I used to open R in the terminal. … Continue reading →

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R/GRASS connection: more than the sum of its parts

Posted on March 25, 2011 by

GRASS GIS is a very powerfull GIS offering an extensive set of tools for geospatial data management and analysis, image processing, and spatial modeling. The possibility to directly interact with R further improves the geospatial analysis capabilities of GRASS (see … Continue reading →

Posted in Data handling, GIS, GRASS GIS, Modelling, R computing environment | Tagged , , , , , | 13 Comments

Combining text from data frame in one text string in R

Posted on March 2, 2011 by

Earlier I wrote about the custom STRJOIN function in OpenOffice. A very handy function when you need to combine all values in a row or column (or combination of the two), separated by a delimiter. In R this is (also) … Continue reading →

Posted in Data handling, R computing environment | Tagged , | 1 Comment

Finding and renaming long file names with R

Posted on February 28, 2011 by

I have never given it a though, but there is apparently a limit to the length of file names that can be handled by Windows Explorer of Windows XP. I found out when trying to copy my Zotero folder to … Continue reading →

Posted in R computing environment | Tagged , , , , | 2 Comments

Using the GRASS command g.mlist in R

Posted on February 23, 2011 by

In this post I was trying to find a way to get a list of GRASS data layers in R. The problem is running the GRASS function ‘g.list’ from R (using system or execGRASS from the spgrass6 package) gives a … Continue reading →

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Using the GRASS command g.list in R

Posted on February 23, 2011 by

Running grass commands within R is easy using either the system function or the spgrass6 package. But sometimes the GRASS outputs are not easy to read into a data frame or vector. For example, what if you want a vector … Continue reading →

Posted in Data handling, GIS, GRASS GIS, R computing environment, Uncategorized | Tagged , , , , | 1 Comment

Finding and removing carriage returns in your SQLite table

Posted on January 13, 2011 by

The problem with copy data from e.g., an excel or calc sheet into an SQLite database (or any database I reckon) is that the data you copy might include an carriage return. I found this out the hard way after … Continue reading →

Posted in Data handling, GRASS GIS, SQLite | Tagged , , , | 1 Comment

MapTiler to create online maps

Posted on July 24, 2010 by

For a project a few years ago we created a vegetation map for central and southwest Kenya (see http://ecodiv.org/trapnell for more information). The map together with documentation was initially made available on CD-ROM. I also created an online map. Apart … Continue reading →

Posted in GIS, online mapping, vegetation | Tagged , , , , , | 2 Comments

Build in functions in R

Posted on March 2, 2010 by

Almost everything in R is done through functions. Quick-R gives a very useful overview of commonly used numeric and character functions for creating or recoding variables. And while you are at it, check out the rest of the website. It … Continue reading →

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Importing WorldClim climate .bil datalayers in GRASS GIS

Posted on February 6, 2010 by

In a previous post I wrote how you can generate bioclimatic data layers based on monthly rainfall and temperature data in GRASS GIS. Monthly climate data for future conditions can be downloaded from WorldClim in generic grid (raster) format only. … Continue reading →

Posted in Data handling, GIS software, GRASS GIS, R computing environment | Tagged , , | 12 Comments