I'd like to correctly parse the MOD13Q1 VI Quality layer (see Table 2 in "layers" here). For this, I'm trying to follow Example 1 from this tutorial (page 10).
I'll illustrate my problem with a pixel value of "VI Quality" from my real data set: 35038
First, I transform it to the binary value 1000100011011110.
Then, I separate this binary value into different bit words (from right to left) according to Table 2:
1 0 001 0 0 0 11 0111 10
Following Example 1 ("Please bear in mind that the binary bit-string is parsed from right to left, and the individual bits within a bit-word are read from left to right."), I would then assume that I'd get the following bit words for the different categories:
MODLAND_QA: 10VI usefulness: 0111Aerosol quantity: 11... and so onHowever, the problem is that the value 0111 doesn't exist in Table 2. I guess that there are two possible explanations for this:
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I'll illustrate my problem with a pixel value of "VI Quality" from my real data set: 35038
First, I transform it to the binary value 1000100011011110.
Then, I separate this binary value into different bit words (from right to left) according to Table 2:
1 0 001 0 0 0 11 0111 10
Following Example 1 ("Please bear in mind that the binary bit-string is parsed from right to left, and the individual bits within a bit-word are read from left to right."), I would then assume that I'd get the following bit words for the different categories:
MODLAND_QA: 10VI usefulness: 0111Aerosol quantity: 11... and so onHowever, the problem is that the value 0111 doesn't exist in Table 2. I guess that there are two possible explanations for this:
- I made a mistake trying to apply the tutorial. In that case I'd be very thankful if somebody could point me to the right direction.
- I applied the tutorial correctly, but Table 2 is incorrect or incomplete. Could anybody confirm if this might really be the case, and if yes, where to find information about missing values?
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