r.cross output misses one category

[pvanbosgeo]

I have two layers with 2 categories (1 and 2) each. When combined using r.cross the output is a map with three categories according to the message on the command line. Also, the map created has three colours.

Yet, there should be four categories, and there is indeed a fourth category with value 0 (but without category label)

r.stats -l input=grevrobenvclust                                   
0 
1 category 1; category 2
2 category 2; category 1
3 category 2; category 2
* no data

This category 0 is the area where both layers have a value 1. See also the attached screenshot.

So there are the problems that:

• only three categories are reported, while there are four in reality
• one (the first) category has no category label with the values of the input maps
• the category 0 (without category label) is assigned the same colour as category 3
• When running the tool to create interactively the colour table, colours are only assigned to categories 1-3, so the category 0 should not have a colour (see attached screenshot). Clicking the 'apply' button without changing the categories, and the category 0 will indeed disappear from the map.

[mlennert]

Replying to pvanbosgeo:

I have two layers with 2 categories (1 and 2) each. When combined using r.cross the output is a map with three categories according to the message on the command line. Also, the map created has three colours.

Yet, there should be four categories, and there is indeed a fourth category with value 0 (but without category label)

r.stats -l input=grevrobenvclust                                   
0 
1 category 1; category 2
2 category 2; category 1
3 category 2; category 2
* no data

I can confirm this with the NC dataset in grass73. Maybe some issue with category value 0 ?:

r.cross -z input=landclass96@PERMANENT,geology_30m@PERMANENT output=test
r.category map=test@user1
0	
1	category 1; CZlg
2	category 1; CZig
3	category 1; CZbg
4	category 1; CZve
5	category 1; CZam
6	category 1; CZg
7	category 1; CZam
8	category 1; CZbg
9	category 1; Km
10	category 1; CZam
11	category 2; CZfg
12	category 2; CZlg
13	category 2; CZig
14	category 2; CZbg
15	category 2; CZam
16	category 2; CZbg
17	category 2; Km
18	category 2; CZam
19	category 2; CZam
20	category 3; CZfg
21	category 3; CZlg
22	category 3; CZig
23	category 3; CZbg
24	category 3; CZve
25	category 3; CZam
26	category 3; CZg
27	category 3; CZam
28	category 3; CZbg
29	category 3; Km
30	category 4; CZfg
31	category 4; CZlg
32	category 4; CZig
33	category 4; CZbg
34	category 4; CZve
35	category 4; CZam
36	category 4; CZg
37	category 4; CZam
38	category 4; CZbg
39	category 4; Km
40	category 4; CZam
41	category 4; CZam
42	category 5; CZfg
43	category 5; CZlg
44	category 5; CZig
45	category 5; CZbg
46	category 5; CZve
47	category 5; CZam
48	category 5; CZg
49	category 5; CZam
50	category 5; CZbg
51	category 5; Km
52	category 5; CZam
53	category 5; CZam
54	category 6; CZfg
55	category 6; CZlg
56	category 6; CZig
57	category 6; CZbg
58	category 6; CZve
59	category 6; CZam
60	category 6; CZbg
61	category 6; Km
62	category 7; CZfg
63	category 7; CZig

With r.stats I get:

r.stats -cl test
0  15374
1 category 1; CZlg 5652
2 category 1; CZig 39828
3 category 1; CZbg 4230
4 category 1; CZve 248
5 category 1; CZam 9
6 category 1; CZg 19
7 category 1; CZam 156
8 category 1; CZbg 183
9 category 1; Km 29
10 category 1; CZam 15
11 category 2; CZfg 943
12 category 2; CZlg 178
13 category 2; CZig 83
14 category 2; CZbg 127
15 category 2; CZam 90
16 category 2; CZbg 169
17 category 2; Km 264
18 category 2; CZam 56
19 category 2; CZam 2
20 category 3; CZfg 9047
21 category 3; CZlg 5600
22 category 3; CZig 6037
23 category 3; CZbg 1342
24 category 3; CZve 24
25 category 3; CZam 102
26 category 3; CZg 3
27 category 3; CZam 338
28 category 3; CZbg 394
29 category 3; Km 37
30 category 4; CZfg 7744
31 category 4; CZlg 1088
32 category 4; CZig 1434
33 category 4; CZbg 2935
34 category 4; CZve 156
35 category 4; CZam 11
36 category 4; CZg 70
37 category 4; CZam 955
38 category 4; CZbg 411
39 category 4; Km 168
40 category 4; CZam 70
41 category 4; CZam 14
42 category 5; CZfg 43767
43 category 5; CZlg 9039
44 category 5; CZig 28336
45 category 5; CZbg 19434
46 category 5; CZve 1956
47 category 5; CZam 414
48 category 5; CZg 694
49 category 5; CZam 4900
50 category 5; CZbg 3770
51 category 5; Km 833
52 category 5; CZam 279
53 category 5; CZam 64
54 category 6; CZfg 3514
55 category 6; CZlg 492
56 category 6; CZig 159
57 category 6; CZbg 121
58 category 6; CZve 17
59 category 6; CZam 419
60 category 6; CZbg 18
61 category 6; Km 5
62 category 7; CZfg 64
63 category 7; CZig 120
* no data 950

and when running r.stats directly on the two input maps:

r.stats -lnc landclass96,geology_30m
1  217 CZfg 15374
1  262 CZlg 5652
1  270 CZig 39828
1  405 CZbg 4230
1  583 CZve 248
1  720 CZam 9
1  766 CZg 19
1  862 CZam 156
1  910 CZbg 183
1  921 Km 29
1  946 CZam 15
2  217 CZfg 943
2  262 CZlg 178
2  270 CZig 83
2  405 CZbg 127
2  862 CZam 90
2  910 CZbg 169
2  921 Km 264
2  946 CZam 56
2  948 CZam 2
3  217 CZfg 9047
3  262 CZlg 5600
3  270 CZig 6037
3  405 CZbg 1342
3  583 CZve 24
3  720 CZam 102
3  766 CZg 3
3  862 CZam 338
3  910 CZbg 394
3  921 Km 37
4  217 CZfg 7744
4  262 CZlg 1088
4  270 CZig 1434
4  405 CZbg 2935
4  583 CZve 156
4  720 CZam 11
4  766 CZg 70
4  862 CZam 955
4  910 CZbg 411
4  921 Km 168
4  946 CZam 70
4  948 CZam 14
5  217 CZfg 43767
5  262 CZlg 9039
5  270 CZig 28336
5  405 CZbg 19434
5  583 CZve 1956
5  720 CZam 414
5  766 CZg 694
5  862 CZam 4900
5  910 CZbg 3770
5  921 Km 833
5  946 CZam 279
5  948 CZam 64
6  217 CZfg 3514
6  262 CZlg 492
6  270 CZig 159
6  405 CZbg 121
6  583 CZve 17
6  862 CZam 419
6  910 CZbg 18
6  921 Km 5
7  217 CZfg 64
7  270 CZig 120

[martinl]

Still relevant?

[veroandreo]

IIUC, this was fixed in #72281.

I tested in relbranch and I get a category 0 which is the product of the 2 input maps:

r.cross -z input=landclass96@PERMANENT,geology_30m@PERMANENT output=test
r.category map=test
0	developed; CZfg
1	developed; CZlg
2	developed; CZig
3	developed; CZbg
...