Quick-R

http://www.statmethods.net
http://graphpad.com/quickcalcs/posttestintro.cfm

Line to polygon conversion in GRASS

http://osgeo-org.1803224.n2.nabble.com/converting-lines-to-polygons-td5557002.html

v.in.ogr -o dsn=C:\path\to\shapefile\or\dxf.file output=circles1 type=line
v.clean input=circles1 output=circles2 tool=snap,break,rmdupl thresh=0.2,0,0
v.type input=circles2 output=circles3 type=line,boundary
v.centroids input=circles3 output=circles4 option=add

Be sure to play with the treshold parameter of v.clean

Launching linux programs with a specific locale

To launch a program in Linux with a different locale, use the syntax :

LANG=en_US.UTF-8 R

if it does not work, use

LANGUAGE=en_US.utf8 R

This command launches R with the en_US.UTF-8 locale.

Subversion in Debian server/Ubuntu client

#In the debian server :

#Create an empty data repository
cd /data/aaworks/
svnadmin create R_repository

#Import already existing source files into it
svn import SeaWiFS_bio/Rfiles/Ekumen_R/ file:///data/aaworks/R_repository/Ekumen_R/

#List the imported files
svn list file:///data/aaworks/R_repository/Ekumen_R

#Create a working directory and checkout
cd ~
mkdir Ekumen_R/
svn checkout file:///data/aaworks/R_repository/Ekumen_R

cd Ekumen_R/
svn list

#After modifiying a source file, one can commit :
svn commit

#You can checkout files in the ubuntu client through ssh :
svn checkout svn+ssh://ekumen/data/aaworks/R_repository/Ekumen_R

Julian date conversion in R

Convert the Julian day into Date format
strptime("180", "%j")

or

strptime("1998249", "%Y%j")
[1] "1998-09-06"

Compiling Orfeo on Ubuntu Lucid

For OTB, install the following ubuntu packages :

libfltk1.1-dev libcurl3-dev libfftw3-dev libgdal1-1.7.0 mercurial fluid cmake-curses-gui libglu1-mesa-dev libgeotiff-dev uuid-dev libexpat1-dev

Running SEADAS in 32-bits mode in Ubuntu 64-bits

Simply install the Ubuntu package ia32-libs