FHX2 is software that helps analyze fire history using fire scars and other fire-related injuries found in the annual growth rings of trees. FHX2 provides a means for entering, archiving, storing, editing, and manipulation of fire history information from tree rings, which in turn, provides a more efficient mechanism for data storage and exchange. FHX2 creates master fire charts displaying fire chronologies for individual trees or for individual sites. FHX2 has powerful statistical functions for analyzing the seasonality of past fires, temporal changes in fire regimes, or spatial differences in fire occurrence between sites. The software is capable of statistically analyzing and modeling fire interval distributions using the Weibull distribution. FHX2 also provides access to a superposed epoch analysis program for analyzing the relationship between past fire and climate. The Graphics Module creates, displays, and prints master fire charts. Each horizontal line can represent one tree, a sub-site, composite information for an entire site, or an entire region. Each small vertical bar represents a dated fire event.
Download the program
fhx2.zip into a folder on your hard
drive and extract all the files into your
folder. If a file already exists with that file name, simply
answer "yes" to the question to overwrite the existing file.
Be sure to first set the "FHX2 Folder" (usually "c:\fhx2\")
and the "Workspace Folder" (something like "c:\fhx2\work\")
from the FHX2 main menu before continuing with FHX2. PAYMENT
IS NO LONGER REQUIRED.
As with any software, I expect proper citation to be given to this software when used for your research, just as you would programs ARSTAN and COFECHA, for example. Possible citations include:
Grissino-Mayer, H.D. (1995). Tree-ring reconstructions of climate and fire history at El Malpais National Monument, New Mexico. Ph.D. dissertation, The University of Arizona, Tucson. 407 pp.
Grissino-Mayer, H.D. (1999). Modeling fire interval data from the American Southwest with the Weibull distribution. International Journal of Wildland Fire, 9(1), 37-50.
Grissino-Mayer, H.D. (2001). FHX2 - Software for analyzing temporal and spatial patterns in fire regimes from tree rings. Tree-Ring Research, 57(1), 113-122.
Most recent updates listed first:
- Added program EVENT.exe version 6.02P to the FHX2 build to overcome issues of confidence intervals being too wide in previous vesions of EVENT and FHEVENT (FHEVENT is essentially the same program created by Richard Holmes).
- The range of years that can be examined in all modules has been expanded out to the year 2015 to ensure compatibility for the next 10 years.
- The lengths of all fields required for entering site information in the Data Entry Module have been increased to accommodate very long entries.
- The Summary option in the Statistics Module now calculates both the sample depth (number of trees per year) and the sample depth of the recorder years (number of recorder trees per year).
- Added two different calculations of Fire Frequency in the Statistics Module, the traditional fire frequency (1/MFI = mean fire interval) and the Weibull fire frequency (1/WMPI = 1/(Weibull Median Probability Interval)).
- The begin and end comment lines in the header information of the FHX2 file have been updated to preserve any comments manually entered via a text editor. All comments must go in-between the begin and end comment lines.
- The opening menu in FHX2 now features enhanced information for setting both the FHX2 folder (where the FHX2 software resides) and the Workspace folder (where all your work files will reside). Note: both of these must be set for FHX2 to function properly.
- The Maximum Hazard Interval in the Statistics Module is now calculated using the 0.50 cutoff rate, as this is more ecologically reasonable, i.e., once the hazard rate passes 0.50, the probability is high for fire occurrence.
- The Statistics Module contains a new feature. On "Set Range," the user can "lock" the range of years being analyzed, which carries over from one file to the next. This allows you to analyze the same set of years for many different sites with ease.
How to Create Graphics
Users will notice that the Graphics capabilities of FHX2 no longer operate on Windows operating systems beginning with Windows 7, and here I suggest a method for creating and importing graphics into standard programs used today. I encourage all users to use FHAES, which (among other things) produces wonderful graphics in standard PNG format that also include sample depth and percentage scarred graphs at the top of the graph.
So, how do we run FHX2 and take advantage of its graphics capabilities on PCs running later versions of Windows? You need TWO things: a virtual PC and Dosbox, and its very easy to set this up. First, I run Windows 7 as well as a virtual PC running Windows XP which allows me to still use the full range of functions, tests, and graphics found in FHX2 when I switch over to the virtual PC. Anyone can easily set up a virtual PC if you're running Windows, which allows you to run older versions of Windows. Instructions for doing so can be found at many web locations.
Second, once your virtual PC is set up and running, download and run the program Dosbox. This is becoming very popular with users who wish to run older DOS-based "legacy" software. Dosbox runs in a separate window on your PC and emulates an older DOS PC capable of running FHX2 at its full power, including creating graphics on screen.
How to Import Graphics Into Other Programs
You need to know that the graphics file created by FHX2 (using the Plot option in the Graphics Module) is in HPGL format (Hewlett-Packard Graphics Language), perhaps the most common format when FHX2 was first developed in the early 1990s. Second, you should use ONLY "open symbols" in your fire history chart before plotting to a file, rather than "closed symbols." The closed symbols will turn out jagged when imported into other programs. Third, if you want a graph that uses all black lines, you can change the colors in FHX2 to be all black rather than different colors.
The easiest way to convert the HPGL file to another graphics format is to use a standard online converter, such as the one available from CoolUtils.com. On this web page, you can import the HPGL file created in FHX2 and convert it directly to JPEG (or TIF, PNG, PDF, or SWF) format, then download the graphic and import directly into Microsoft Word, PowerPoint, Excel, or whichever program you use to display your graphics.
Alternatively, many graphics programs can directly import HPGL format, such as CorelDraw (which I use and highly recommend), AutoCAD programs, and Paintshop Pro, to name a few. Once imported, you can then export the graphic to another format, such as JPEG or TIF, which can be directly imported into Microsoft Word or PowerPoint, for example.