4 The Fractal Realizer has been rewritten in Fortran-90. There are
5 no longer any pieces of code in C. The visualization feature (using
6 DrawPixmap) has been eliminated, since maps can be viewed as XPM files
7 after running the model. The new code has been compiled and tested
8 with gfortran under Linux on an Athlon-64 box. Example scripts and
9 data are available in directories below examples/. The code is in
10 the src/ directory. The previous README file is still included here
15 If you are using gfortran under Linux, simply do the following to build
16 and install the Fractal Realizer. Download the code and examples:
18 $ wget http://www.geobabble.org/~hnw/frdist.90
20 Then extract the code and examples:
22 $ tar xvzf frdist90.tar.gz
29 This will produce the binary program called realizer. To install the
30 Fractal Realizer in /usr/local/bin:
37 The Fractal Realizer has many options, and some of these are mutually
38 exclusive. Simply running the executable begins a cascade of questions
39 from the model which query the user to set up the options for the
40 simulation run. Responses to the questions direct the subsequent
41 questions, changing the way that the option tree is traversed. This
42 verbose interaction mode is a good way to become familiar with the wide
43 array of Fractal Realizer options. After all questions are answered,
44 the simulation begins.
46 Because answering all of the input questions for each run would be
47 tedious, the Fractal Realizer writes a script file, inpout.scr, containing
48 the input answers from the last run. Thus, the last simulation can be
49 repeated by issuing the command:
51 $ realizer < input.scr
53 To change a few input settings, it is not necessary to wade through all
54 of the input questions again. Instead, simply edit the input.scr script
55 file directly, and then re-run the simulation using the modified script
56 file. Mnemonic comments within the script file aid in such editing
59 A number of demonstration .scr script files are included in the in the
60 examples/ directory, and running these "canned" examples is a good way to
61 test the installation, as well as to see the capabilities of the Fractal
62 Realizer. Final landscapes and tie maps can be output in several formats,
63 including XPM and GRASS.
65 The FR program uses a heap sort to sort the entire map to find the
66 highest probability sites, so execution time will increase rapidly as
67 the size of the map is increased. Execution time also increases with
68 increasing numbers of categories in the map. Because of the midpoint
69 displacement algorithm for generating (pseudo)fractals, the maps must
70 be square, with sides of (2**n)+1. However, the use of constraint masks
71 will permit oddly-shaped and smaller synthetic maps to be generated
72 while still preserving both p and the fractal dimension of each category.
74 The Fractal Realizer has proven useful and stimulating. Be sure
75 to read and cite our paper in Conservation Ecology available at
76 http://www.ecologyandsociety.org/vol6/iss1/art2/
79 -------------------------------------------------------------------------------
81 Eastern Forest Environmental Threat Assessment Center
83 Southern Research Station
84 200 WT Weaver Boulevard
85 Asheville, NC 28804-3454
86 -------------------------------------------------------------------------------
87 Forrest Hoffman mailto:forrest@climatemodeling.org
88 Oak Ridge National Laboratory mailto:forrest@computer.org
89 Climate & Carbon Research Institute http://www.climatemodeling.org/~forrest
90 Computer Science & Mathematics Div. (865) 576-7680 voice
91 Building 5600, Room C221, MS 6016 (865) 576-5491 fax
92 P.O. Box 2008 Deliveries: Bethel Valley Road
93 Oak Ridge TN 37831-6016 35� 55' 23" N 84� 19' 20" W
94 -------------------------------------------------------------------------------