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Metrics supported APACK calculates the following metrics: Area statistics Absolute and relative Edge sta

Fig. 3. Introduction - Landscape ecologists need to identify landscape patterns - Landscape metrics help ecologists evaluate patterns - APACK is software that calculates landscape metrics. Fig. 1. APACK. Input APACK reads ASCII text maps (Fig. 1).

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Metrics supported APACK calculates the following metrics: Area statistics Absolute and relative Edge sta

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  1. Fig. 3 Introduction - Landscape ecologists need to identify landscape patterns - Landscape metrics help ecologists evaluate patterns - APACK is software that calculates landscape metrics Fig. 1 APACK Input APACK reads ASCII text maps (Fig. 1). APACK reads ERDAS 7.4 GIS map files (Fig. 2). Many programs export files of this type. Output APACK creates an ASCII text summary of processing results to be used as is (Fig. 3). APACK creates comma delimited ASCII text to be imported into spreadsheet packages (Fig. 4). APACK creates ERDAS 7.4 GIS map files (Fig. 5). The map in figure 5 represents a percolation map derived from the map in figure 2. Why use APACK? - it processes maps very flexibly - it processes maps very quickly - it processes very large maps Fig. 4 Fig. 2 Metrics supported APACK calculates the following metrics: Area statistics Absolute and relative Edge statistics Edge density Perimeter shared between classes* Information theoretic measures Contagion (absolute and relative) Diversity Dominance (absolute and relative) Edge distribution evenness* Evenness Neutral landscape methods Percolation map generation* Patch statistics Average area (standard and normalized*) Average perimeter Maximum area Minimum area Number of patches in a size class* Total area of patches in a size class* Probabilistic association measures Adjacency Electivity* Shape measures Average perimeter to area ratios Fractal dimension Structural measures Connectivity* Textural measures Angular Second Moment* Inverse Difference Moment* Lacunarity* (* only available in APACK) These metrics are commonly cited metrics in the landscape ecology literature. The exact formulas and references are documented in APACK’s manual. Fig. 5 Results Flexibility The user can specify options on the command line to minimize both calculation time and output data. - only desired metrics are calculated - metrics are calculated only for user-specified classes of interest - metrics are calculated only for a user-specified region of interest Accuracy APACK has been tested against FRAGSTATS output. It has also been verified by hand calculation. Speed Fig. 6: Rows = 141 Columns = 196 Megabytes = 0.02 Fig. 7: Rows = 3338 Columns = 1725 Megabytes = 5.5 Fig. 8: Rows = 5822 Columns = 3955 Megabytes = 21.9 43.1 km 113 km 5.6 km See Fig. 6 See Fig. 7 See Fig. 8 Size Fig. 9: Rows = 16995 Columns = 15846 Megabytes = 256 468 km Availability APACK is currently written to run on Win 95, Win 98, Windows NT, and the SunOS. The program and documentation can be downloaded for free from ftp://flel.forest.wisc.edu/apack/version211/. You can also join the APACK mailing list to be informed of APACK-related news such as new releases and bug fixes. Email apack-mail@facstaff.wisc.edu and let them know you want to join. See Fig. 9

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