[GRASS-user] r.stats: negative cell counts and percentages

[Hermann Peifer]

Hi,

I have the following raster map:

Type of Map:  raster               Number of Categories: 255 
  Data Type:    CELL 
    Rows:         58000 
      Columns:      67000 
        Total Cells:  3886000000

r.stats (-c and -p) tells me:

1 608232            1  -0.15%
2 13691259          2  -3.35%
3 2047970           3  -0.50%
4 194288            4  -0.05%
5 105156            5  -0.03%
6 303014            6  -0.07%
7 632953            7  -0.15%
8 110266            8  -0.03%
9 119532            9  -0.03%
10 301250           10  -0.07%
11 859077           11  -0.21%
12 110022085        12 -26.90%
13 3174787          13  -0.78%
14 587198           14  -0.14%
15 3958146          15  -0.97%
16 2526227          16  -0.62%
17 3996373          17  -0.98%
18 38131042         18  -9.32%
19 989760           19  -0.24%
20 27504344         20  -6.73%
21 22922649         21  -5.61%
22 3188788          22  -0.78%
23 52637630         23 -12.87%
24 71417325         24 -17.46%
25 29867401         25  -7.30%
26 12513397         26  -3.06%
27 17347949         27  -4.24%
28 10163292         28  -2.49%
29 25264490         29  -6.18%
30 710832           30  -0.17%
31 6661714          31  -1.63%
32 13529887         32  -3.31%
33 150968           33  -0.04%
34 1583419          34  -0.39%
35 1275927          35  -0.31%
36 9942214          36  -2.43%
37 314126           37  -0.08%
38 75737            38  -0.02%
39 1141921          39  -0.28%
40 1231039          40  -0.30%
41 11439484         41  -2.80%
42 590138           42  -0.14%
43 331796           43  -0.08%
255 -913132378      255 223.28%

I guess there is an integer overflow somewhere(?)

Hermann