1r.li.edgedensity(1) GRASS GIS User's Manual r.li.edgedensity(1)
2
6 r.li.edgedensity - Calculates edge density index on a raster map, us‐
7 ing a 4 neighbour algorithm
8
10 raster, landscape structure analysis, patch index
11
13 r.li.edgedensity
14 r.li.edgedensity --help
15 r.li.edgedensity [-b] input=name config=name output=name
16 [patch_type=string] [--overwrite] [--help] [--verbose] [--quiet]
17 [--ui]
18 Flags:
20 -b
21 Exclude border edges
22 --overwrite
24 Allow output files to overwrite existing files
25 --help
27 Print usage summary
28 --verbose
30 Verbose module output
31 --quiet
33 Quiet module output
34 --ui
36 Force launching GUI dialog
37 Parameters:
39 input=name [required]
40 Name of input raster map
41 config=name [required]
43 Configuration file
44 output=name [required]
46 Name for output raster map
47 patch_type=string
49 The value of the patch type
50 It can be integer, double or float; it will be changed in function
51 of map type
52
54 r.li.edgedensity calculates:
55 • the density of all edges of patch type k , or
57 • the density of all edges in the sampling area if k is not spec‐
59 ified,
60 with:
62 • k: patch type
64 • m: number of patch types
66 • n: number of edge segments of patch type k
68 • eik :total edge length in the landscape involving patch type k
70 • Area: total landscape area
72 The unit is meters per hectare.
74
76 Do not use absolute path names for the config and output file/map pa‐
77 rameters. If the "moving window" method was selected in
78 g.gui.rlisetup, then the output will be a raster map, otherwise an
79 ASCII file will be generated in the folder C:\Users\userxy\App‐
80 Data\Roaming\GRASS8\r.li\output\ (MS-Windows) or
81 $HOME/.grass8/r.li/output/ (GNU/Linux).
82 If the input raster map contains only NULL values then r.li.edgedensity
84 consider to have 0 patches.
85 If area is 0 r.li.edgedensity returns NULL; this is only possible if
86 input raster is masked.
87
89 To calculate the edge density index on map my_map, using my_conf con‐
90 figuration file (previously defined with g.gui.rlisetup) and saving re‐
91 sults in my_out, run:
92 r.li.edgedensity input=my_map conf=my_conf output=my_out
93 To calculate edge density index of patch_type 34, using "my_conf" con‐
94 figuration file and on map "my_map", saving results in "my_out" file
95 run:
96 r.li.edgedensity input=my_map conf=my_conf output=my_out patch_type=34
97 Forest map (Spearfish sample dataset) example:
99 g.region raster=landcover.30m -p
100 r.mapcalc "forests = if(landcover.30m >= 41 && landcover.30m <= 43,1,null())"
101 r.li.edgedensity input=forests conf=movwindow7 out=forests_edgedens_mov7
102 r.univar forests_edgedens_mov7
103 Forest map (North Carolina sample dataset) example:
105 g.region raster=landclass96 -p
106 r.mapcalc "forests = if(landclass96 == 5, 1, null() )"
107 r.li.edgedensity input=forests conf=movwindow7 out=forests_edgedensity_mov7
108 # verify
109 r.univar forests_edgedensity_mov7
110 r.to.vect input=forests output=forests type=area
111 d.mon wx0
112 d.rast forests_edgedensity_mov7
113 d.vect forests type=boundary
114
116 r.li - package overview
117 g.gui.rlisetup
118
120 McGarigal, K., and B. J. Marks. 1995. FRAGSTATS: spatial pattern analy‐
121 sis program for quantifying landscape structure. USDA For. Serv. Gen.
122 Tech. Rep. PNW-351. (PDF)
123
125 Serena Pallecchi student of Computer Science University of Pisa
126 (Italy).
127 Commission from Faunalia Pontedera (PI), Italy (www.faunalia.it)
128 Markus Metz
129
131 Available at: r.li.edgedensity source code (history)
132 Accessed: Saturday Jan 21 20:38:40 2023
134 Main index | Raster index | Topics index | Keywords index | Graphical
136 index | Full index
137 © 2003-2023 GRASS Development Team, GRASS GIS 8.2.1 Reference Manual
139GRASS 8.2.1 r.li.edgedensity(1)