1r.coin(1) Grass User's Manual r.coin(1)
2
6 r.coin - Tabulates the mutual occurrence (coincidence) of categories
7 for two raster map layers.
8
10 raster
11
13 r.coin
14 r.coin help
15 r.coin [-wq] map1=string map2=string units=string [--verbose]
16 [--quiet]
17 Flags:
19 -w
20 Wide report, 132 columns (default: 80)
21 -q
23 Run quietly
24 --verbose
26 Verbose module output
27 --quiet
29 Quiet module output
30 Parameters:
32 map1=string
33 Name of first raster map
34 map2=string
36 Name of second raster map
37 units=string
39 Unit of measure
40 Options: c,p,x,y,a,h,k,m
41
43 r.coin tabulates the mutual occurrence of two raster map layers' cate‐
44 gories with respect to one another. This analysis program respects the
45 current geographic region and mask settings.
46 r.coin tabulates the coincidence of category values among the two map
48 layers and prepares the basic table from which the report is to be cre‐
49 ated. This tabulation is followed by an indication of how long the
50 coincidence table will be. If the table is extremely long, the user
51 may decide that viewing it is not so important after all, and may can‐
52 cel the request at this point. Assuming the user continues, r.coin
53 then allows the user to choose one of eight units of measure in which
54 the report results can be given. These units are:
55 c
57 cells
58 p
60 percent cover of region
61 x
63 percent of category (column)
64 y
66 percent of category (row)
67 a
69 acres
70 h
72 hectares
73 k
75 square kilometers
76 m
78 square miles
79 Note that three of these options give results as percentage values:
81 "p" is based on the grand total number of cells; "x" is based on only
82 column totals; and "y" is based on only row totals. Only one unit of
83 measure can be selected per report output. Type in just one of the
84 letters designating a unit of measure followed by a for review. After
85 reviewing the report on the screen, the user is given several options.
86 The report may be saved to a file and/or sent to a printer. If
87 printed, it may be printed with either 80 or 132 columns. Finally, the
88 user is given the option to rerun the coincidence tabulation using a
89 different unit of measurement.
90
92 It is not a good idea to run r.coin on a map layer which has a mon‐
93 strous number of categories (e.g., unreclassed elevation). Because
94 r.coin reports information for each and every category, it is better to
95 reclassify those categories (using r.reclass) into a more manageable
96 number prior to running r.coin on the reclassed raster map layer.
97
99 Below is a sample of tabular output produced by r.coin. Here, map out‐
100 put is stated in units of square miles. The report tabulates the coin‐
101 cidence of the Spearfish sample database's owner and road raster map
102 layers' categories. The owner categories in this case refer to whether
103 the land is in private hands (category 1) or is owned by the U.S. For‐
104 est Service (category 2). The roads map layer categories refer to vari‐
105 ous types of roads (with the exception of category value "0", which
106 indicates "no data"; i.e., map locations at which no roads exist).
107 r.coin does not report category labels. The user should run r.report or
108 r.category to obtain this information.
109 The body of the report is arranged in panels. The map layer with the
111 most categories is arranged along the vertical axis of the table; the
112 other, along the horizontal axis. Each panel has a maximum of 5 cate‐
113 gories (9 if printed) across the top. In addition, the last two columns
114 reflect a cross total of each column for each row. All of the cate‐
115 gories of the map layer arranged along the vertical axis are included
116 in each panel. There is a total at the bottom of each column repre‐
117 senting the sum of all the rows in that column. A second total repre‐
118 sents the sum of all the non-zero category rows. A cross total (Table
119 Row Total) of all columns for each row appears in a separate panel.
120 Note how the following information may be obtained from the sample
122 report.
123 In the Spearfish data base, in area not owned by the Forest Service,
125 there are 50.63 square miles of land not used for roads. Roads make up
126 9.27 square miles of land in this area.
127 Of the total 102.70 square miles in Spearfish, 42.80 square miles is
129 owned by the Forest Service.
130 In total, there are 14.58 square miles of roads.
131 There are more category 2 roads outside Forest Service land (2.92 mi.
133 sq.) than there are inside Forest land boundaries (0.72 mi. sq.).
134 Following is a sample report.
136 +------------------------------------------------------------+
137 | COINCIDENCE TABULATION REPORT |
138 |------------------------------------------------------------|
139 |Location: spearfish Mapset: PERMANENT Date: Wed Jun 1 |
140 | |
141 | Layer 1: owner -- Ownership |
142 | Layer 2: roads -- Roads |
143 | Mask: none |
144 | |
145 | Units: square miles |
146 |------------------------------------------------------------|
147 | Window: North: 4928000.00 |
148 | West: 590000.00 East: 609000.00 |
149 | South: 4914000.00 |
150 +------------------------------------------------------------+
151 Panel #1 of 1
152 +--------------------------------------------------------+
153 | | owner | Panel Row Total |
154 | cat# | 1 | 2 | w cat 0 | w/o cat 0 |
155 |--------------------------------------------------------|
156 |r 0 | 50.63 | 37.49 | 88.12 | 88.12 |
157 |o 1 | 1.53 | 0.68 | 2.21 | 2.21 |
158 |a 2 | 2.92 | 0.72 | 3.64 | 3.64 |
159 |d 3 | 3.97 | 2.57 | 6.54 | 6.54 |
160 |s 4 | 0.65 | 1.36 | 2.00 | 2.00 |
161 | 5 | 0.19 | 0.00 | 0.19 | 0.19 |
162 |--------------------------------------------------------|
163 |Total | | | | |
164 |with 0 | 59.90 | 42.80 | 102.70 | 102.70 |
165 |--------------------------------------------------------|
166 |w/o 0 | 9.27 | 5.32 | 14.58 | 14.58 |
167 +--------------------------------------------------------+
168 +--------------------------------+
169 | | Table Row Total |
170 | cat# | w cat 0 | w/o cat 0 |
171 |--------------------------------|
172 |r 0 | 88.12 | 88.12 |
173 |o 1 | 2.21 | 2.21 |
174 |a 2 | 3.64 | 3.64 |
175 |d 3 | 6.54 | 6.54 |
176 |s 4 | 2.00 | 2.00 |
177 | 5 | 0.19 | 0.19 |
178 |--------------------------------|
179 |Total | | |
180 |with 0 | 102.70 | 102.70 |
181 |--------------------------------|
182 |w/o 0 | 14.58 | 14.58 |
183 +--------------------------------+
184 r.coin calculates the coincidence of two raster map layers. Although
187 r.coin allows the user to rerun the report using different units, it is
188 not possible to simply rerun the report with different map layers. In
189 order to choose new map layers, it is necessary to rerun r.coin.
190
192 g.region, r.category, r.describe, r.reclass, r.report, r.stats
193
195 Michael O'Shea,
196 Michael Shapiro,
197 U.S. Army Construction Engineering Research Laboratory
198 Last changed: $Date: 2008-01-13 02:01:00 +0100 (Sun, 13 Jan 2008) $
200 Full index
202 © 2003-2008 GRASS Development Team
204GRASS 6.3.0 r.coin(1)