Summary of MOD10A2/MYD10A2 Bit Values

The Eight Day Snow Cover field in MOD10A2 and MYD10A2 provides a chronology of snow occurrence by associating eight days of snow cover observations with eight separate bits. An introduction to bit processing and interpretation of bit values are provided here.

A single byte consists of eight bits, which is read from right to left. Bit 0 is the least-significant bit, and Bit 7 is the most-significant bit. Bit values are calculated as powers of two. Resulting byte values are calculated by adding the bit values for those bits that are "on".

Summary of bit processing for MOD10A2

So, in the case of the Eight Day Snow Cover field in MOD10A2 and MYD10A2, if snow was present on days one and five (00010001), then the resulting byte value is 17 (1 + 16 = 17). The corresponding grid cell has an integer value of 17.

The following table is provided to interpret the meaning of integer values in the Eight Day Snow Cover field . A number 1 indicates snow for that day, and a 0 indicates no snow for that day.


integer            Day:
 value   8   7   6   5   4   3   2   1
----------------------------------------
   0     0   0   0   0   0   0   0   0
   1     0   0   0   0   0   0   0   1
   2     0   0   0   0   0   0   1   0
   3     0   0   0   0   0   0   1   1
   4     0   0   0   0   0   1   0   0
   5     0   0   0   0   0   1   0   1
   6     0   0   0   0   0   1   1   0
   7     0   0   0   0   0   1   1   1
   8     0   0   0   0   1   0   0   0
   9     0   0   0   0   1   0   0   1
  10     0   0   0   0   1   0   1   0
  11     0   0   0   0   1   0   1   1
  12     0   0   0   0   1   1   0   0
  13     0   0   0   0   1   1   0   1
  14     0   0   0   0   1   1   1   0
  15     0   0   0   0   1   1   1   1
  16     0   0   0   1   0   0   0   0
  17     0   0   0   1   0   0   0   1
  18     0   0   0   1   0   0   1   0
  19     0   0   0   1   0   0   1   1
  20     0   0   0   1   0   1   0   0
  21     0   0   0   1   0   1   0   1
  22     0   0   0   1   0   1   1   0
  23     0   0   0   1   0   1   1   1
  24     0   0   0   1   1   0   0   0
  25     0   0   0   1   1   0   0   1
  26     0   0   0   1   1   0   1   0
  27     0   0   0   1   1   0   1   1
  28     0   0   0   1   1   1   0   0
  29     0   0   0   1   1   1   0   1
  30     0   0   0   1   1   1   1   0
  31     0   0   0   1   1   1   1   1
  32     0   0   1   0   0   0   0   0
  33     0   0   1   0   0   0   0   1
  34     0   0   1   0   0   0   1   0
  35     0   0   1   0   0   0   1   1
  36     0   0   1   0   0   1   0   0
  37     0   0   1   0   0   1   0   1
  38     0   0   1   0   0   1   1   0
  39     0   0   1   0   0   1   1   1
  40     0   0   1   0   1   0   0   0
  41     0   0   1   0   1   0   0   1
  42     0   0   1   0   1   0   1   0
  43     0   0   1   0   1   0   1   1
  44     0   0   1   0   1   1   0   0
  45     0   0   1   0   1   1   0   1
  46     0   0   1   0   1   1   1   0
  47     0   0   1   0   1   1   1   1
  48     0   0   1   1   0   0   0   0
  49     0   0   1   1   0   0   0   1
  50     0   0   1   1   0   0   1   0
  51     0   0   1   1   0   0   1   1
  52     0   0   1   1   0   1   0   0
  53     0   0   1   1   0   1   0   1
  54     0   0   1   1   0   1   1   0
  55     0   0   1   1   0   1   1   1
  56     0   0   1   1   1   0   0   0
  57     0   0   1   1   1   0   0   1
  58     0   0   1   1   1   0   1   0
  59     0   0   1   1   1   0   1   1
  60     0   0   1   1   1   1   0   0
  61     0   0   1   1   1   1   0   1
  62     0   0   1   1   1   1   1   0
  63     0   0   1   1   1   1   1   1
  64     0   1   0   0   0   0   0   0
  65     0   1   0   0   0   0   0   1
  66     0   1   0   0   0   0   1   0
  67     0   1   0   0   0   0   1   1
  68     0   1   0   0   0   1   0   0
  69     0   1   0   0   0   1   0   1
  70     0   1   0   0   0   1   1   0
  71     0   1   0   0   0   1   1   1
  72     0   1   0   0   1   0   0   0
  73     0   1   0   0   1   0   0   1
  74     0   1   0   0   1   0   1   0
  75     0   1   0   0   1   0   1   1
  76     0   1   0   0   1   1   0   0
  77     0   1   0   0   1   1   0   1
  78     0   1   0   0   1   1   1   0
  79     0   1   0   0   1   1   1   1
  80     0   1   0   1   0   0   0   0
  81     0   1   0   1   0   0   0   1
  82     0   1   0   1   0   0   1   0
  83     0   1   0   1   0   0   1   1
  84     0   1   0   1   0   1   0   0
  85     0   1   0   1   0   1   0   1
  86     0   1   0   1   0   1   1   0
  87     0   1   0   1   0   1   1   1
  88     0   1   0   1   1   0   0   0
  89     0   1   0   1   1   0   0   1
  90     0   1   0   1   1   0   1   0
  91     0   1   0   1   1   0   1   1
  92     0   1   0   1   1   1   0   0
  93     0   1   0   1   1   1   0   1
  94     0   1   0   1   1   1   1   0
  95     0   1   0   1   1   1   1   1
  96     0   1   1   0   0   0   0   0
  97     0   1   1   0   0   0   0   1
  98     0   1   1   0   0   0   1   0
  99     0   1   1   0   0   0   1   1
 100     0   1   1   0   0   1   0   0
 101     0   1   1   0   0   1   0   1
 102     0   1   1   0   0   1   1   0
 103     0   1   1   0   0   1   1   1
 104     0   1   1   0   1   0   0   0
 105     0   1   1   0   1   0   0   1
 106     0   1   1   0   1   0   1   0
 107     0   1   1   0   1   0   1   1
 108     0   1   1   0   1   1   0   0
 109     0   1   1   0   1   1   0   1
 110     0   1   1   0   1   1   1   0
 111     0   1   1   0   1   1   1   1
 112     0   1   1   1   0   0   0   0
 113     0   1   1   1   0   0   0   1
 114     0   1   1   1   0   0   1   0
 115     0   1   1   1   0   0   1   1
 116     0   1   1   1   0   1   0   0
 117     0   1   1   1   0   1   0   1
 118     0   1   1   1   0   1   1   0
 119     0   1   1   1   0   1   1   1
 120     0   1   1   1   1   0   0   0
 121     0   1   1   1   1   0   0   1
 122     0   1   1   1   1   0   1   0
 123     0   1   1   1   1   0   1   1
 124     0   1   1   1   1   1   0   0
 125     0   1   1   1   1   1   0   1
 126     0   1   1   1   1   1   1   0
 127     0   1   1   1   1   1   1   1
 128     1   0   0   0   0   0   0   0
 129     1   0   0   0   0   0   0   1
 130     1   0   0   0   0   0   1   0
 131     1   0   0   0   0   0   1   1
 132     1   0   0   0   0   1   0   0
 133     1   0   0   0   0   1   0   1
 134     1   0   0   0   0   1   1   0
 135     1   0   0   0   0   1   1   1
 136     1   0   0   0   1   0   0   0
 137     1   0   0   0   1   0   0   1
 138     1   0   0   0   1   0   1   0
 139     1   0   0   0   1   0   1   1
 140     1   0   0   0   1   1   0   0
 141     1   0   0   0   1   1   0   1
 142     1   0   0   0   1   1   1   0
 143     1   0   0   0   1   1   1   1
 144     1   0   0   1   0   0   0   0
 145     1   0   0   1   0   0   0   1
 146     1   0   0   1   0   0   1   0
 147     1   0   0   1   0   0   1   1
 148     1   0   0   1   0   1   0   0
 149     1   0   0   1   0   1   0   1
 150     1   0   0   1   0   1   1   0
 151     1   0   0   1   0   1   1   1
 152     1   0   0   1   1   0   0   0
 153     1   0   0   1   1   0   0   1
 154     1   0   0   1   1   0   1   0
 155     1   0   0   1   1   0   1   1
 156     1   0   0   1   1   1   0   0
 157     1   0   0   1   1   1   0   1
 158     1   0   0   1   1   1   1   0
 159     1   0   0   1   1   1   1   1
 160     1   0   1   0   0   0   0   0
 161     1   0   1   0   0   0   0   1
 162     1   0   1   0   0   0   1   0
 163     1   0   1   0   0   0   1   1
 164     1   0   1   0   0   1   0   0
 165     1   0   1   0   0   1   0   1
 166     1   0   1   0   0   1   1   0
 167     1   0   1   0   0   1   1   1
 168     1   0   1   0   1   0   0   0
 169     1   0   1   0   1   0   0   1
 170     1   0   1   0   1   0   1   0
 171     1   0   1   0   1   0   1   1
 172     1   0   1   0   1   1   0   0
 173     1   0   1   0   1   1   0   1
 174     1   0   1   0   1   1   1   0
 175     1   0   1   0   1   1   1   1
 176     1   0   1   1   0   0   0   0
 177     1   0   1   1   0   0   0   1
 178     1   0   1   1   0   0   1   0
 179     1   0   1   1   0   0   1   1
 180     1   0   1   1   0   1   0   0
 181     1   0   1   1   0   1   0   1
 182     1   0   1   1   0   1   1   0
 183     1   0   1   1   0   1   1   1
 184     1   0   1   1   1   0   0   0
 185     1   0   1   1   1   0   0   1
 186     1   0   1   1   1   0   1   0
 187     1   0   1   1   1   0   1   1
 188     1   0   1   1   1   1   0   0
 189     1   0   1   1   1   1   0   1
 190     1   0   1   1   1   1   1   0
 191     1   0   1   1   1   1   1   1
 192     1   1   0   0   0   0   0   0
 193     1   1   0   0   0   0   0   1
 194     1   1   0   0   0   0   1   0
 195     1   1   0   0   0   0   1   1
 196     1   1   0   0   0   1   0   0
 197     1   1   0   0   0   1   0   1
 198     1   1   0   0   0   1   1   0
 199     1   1   0   0   0   1   1   1
 200     1   1   0   0   1   0   0   0
 201     1   1   0   0   1   0   0   1
 202     1   1   0   0   1   0   1   0
 203     1   1   0   0   1   0   1   1
 204     1   1   0   0   1   1   0   0
 205     1   1   0   0   1   1   0   1
 206     1   1   0   0   1   1   1   0
 207     1   1   0   0   1   1   1   1
 208     1   1   0   1   0   0   0   0
 209     1   1   0   1   0   0   0   1
 210     1   1   0   1   0   0   1   0
 211     1   1   0   1   0   0   1   1
 212     1   1   0   1   0   1   0   0
 213     1   1   0   1   0   1   0   1
 214     1   1   0   1   0   1   1   0
 215     1   1   0   1   0   1   1   1
 216     1   1   0   1   1   0   0   0
 217     1   1   0   1   1   0   0   1
 218     1   1   0   1   1   0   1   0
 219     1   1   0   1   1   0   1   1
 220     1   1   0   1   1   1   0   0
 221     1   1   0   1   1   1   0   1
 222     1   1   0   1   1   1   1   0
 223     1   1   0   1   1   1   1   1
 224     1   1   1   0   0   0   0   0
 225     1   1   1   0   0   0   0   1
 226     1   1   1   0   0   0   1   0
 227     1   1   1   0   0   0   1   1
 228     1   1   1   0   0   1   0   0
 229     1   1   1   0   0   1   0   1
 230     1   1   1   0   0   1   1   0
 231     1   1   1   0   0   1   1   1
 232     1   1   1   0   1   0   0   0
 233     1   1   1   0   1   0   0   1
 234     1   1   1   0   1   0   1   0
 235     1   1   1   0   1   0   1   1
 236     1   1   1   0   1   1   0   0
 237     1   1   1   0   1   1   0   1
 238     1   1   1   0   1   1   1   0
 239     1   1   1   0   1   1   1   1
 240     1   1   1   1   0   0   0   0
 241     1   1   1   1   0   0   0   1
 242     1   1   1   1   0   0   1   0
 243     1   1   1   1   0   0   1   1
 244     1   1   1   1   0   1   0   0
 245     1   1   1   1   0   1   0   1
 246     1   1   1   1   0   1   1   0
 247     1   1   1   1   0   1   1   1
 248     1   1   1   1   1   0   0   0
 249     1   1   1   1   1   0   0   1
 250     1   1   1   1   1   0   1   0
 251     1   1   1   1   1   0   1   1
 252     1   1   1   1   1   1   0   0
 253     1   1   1   1   1   1   0   1
 254     1   1   1   1   1   1   1   0
 255     1   1   1   1   1   1   1   1