Madagascar tutorial: Field data processing

Part One

1. Change directory to demo directory

   bash$ cd demo
   

2. Run

   bash$ scons cmp.view
   

   in the Unix shell. A number of commands will appear in the shell followed by Figure 3(a) appearing on your screen.
3. To understand the commands, examine the script that generated them by opening the SConstruct file in a text editor. Notice that, instead of Shell commands, the script contains rules.
   • The first rule, Fetch, allows the script to download the input data file cmp1.rsf from the data server.
   • Other rules have the form Flow(target,source,command) for generating data files or Plot and Result for generating picture files.
   • Fetch, Flow, Plot, and Result are defined in MADAGASCAR's rsf.proj package, which extends the functionality of SCons .
4. To better understand how rules translate into commands, run

   bash$ scons -c cmp.rsf
   

   The -c flag tells scons to remove the cmp.rsf file and all its dependencies.
5. Next, run

   bash$ scons -n cmp.rsf
   

   The -n flag tells scons not to run the command but simply to display it on the screen. Identify the lines in the SConstruct file that generate the output you see on the screen.
6. Run

   bash$ scons cmp.rsf
   

   Examine the file cmp.rsf both by opening it in a text editor and by running

   bash$ sfin cmp.rsf
   

   When you view cmp.rsf in the text editor, you see a history of all the programs used to create the file. The sfin program lists basic information about the file including data dimensions and extents of each axis.

Madagascar tutorial: Field data processing