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landsat 8 cloud band: how to understand their (bit) coding?

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I am trying to understand how to use the Lansdat 8 cloud quality band. The user guide L8_Surface-Reflectance-Code-LASRC-Product-Guide.pdf does not explain much, but just gives tables (Table 7-1, 7-2 and 7-3) I don't really understand how to read those, and how to use them.

Could someone help walk through this table? My understanding is I need to convert the results of the pixel_qa band into bits. In R, I use intToBits() and get a sequence of bits, say for pixel value 388:

intToBits(388)

#>  [1] 00 00 01 00 00 00 00 01 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00

#> [24] 00 00 00 00 00 00 00 00 00

How do I interpret this? When the table below says Attribute Clear, is it for 01 values, and all others (00, 10, 11) are not Clear? I imagine that some attribute contradict each other (cannot have clear and cloud and high cloud confidence in the same time?)

Thanks!

landsat-8 cloud-cover

share|improve this question

asked 10 mins ago

MatifouMatifou

651420

add a comment | 

0

I am trying to understand how to use the Lansdat 8 cloud quality band. The user guide L8_Surface-Reflectance-Code-LASRC-Product-Guide.pdf does not explain much, but just gives tables (Table 7-1, 7-2 and 7-3) I don't really understand how to read those, and how to use them.

Could someone help walk through this table? My understanding is I need to convert the results of the pixel_qa band into bits. In R, I use intToBits() and get a sequence of bits, say for pixel value 388:

intToBits(388)

#>  [1] 00 00 01 00 00 00 00 01 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00

#> [24] 00 00 00 00 00 00 00 00 00

How do I interpret this? When the table below says Attribute Clear, is it for 01 values, and all others (00, 10, 11) are not Clear? I imagine that some attribute contradict each other (cannot have clear and cloud and high cloud confidence in the same time?)

Thanks!

landsat-8 cloud-cover

share|improve this question

asked 10 mins ago

MatifouMatifou

651420

add a comment | 

I am trying to understand how to use the Lansdat 8 cloud quality band. The user guide L8_Surface-Reflectance-Code-LASRC-Product-Guide.pdf does not explain much, but just gives tables (Table 7-1, 7-2 and 7-3) I don't really understand how to read those, and how to use them.

Could someone help walk through this table? My understanding is I need to convert the results of the pixel_qa band into bits. In R, I use intToBits() and get a sequence of bits, say for pixel value 388:

intToBits(388)

#>  [1] 00 00 01 00 00 00 00 01 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00

#> [24] 00 00 00 00 00 00 00 00 00

How do I interpret this? When the table below says Attribute Clear, is it for 01 values, and all others (00, 10, 11) are not Clear? I imagine that some attribute contradict each other (cannot have clear and cloud and high cloud confidence in the same time?)

Thanks!

landsat-8 cloud-cover

share|improve this question

asked 10 mins ago

MatifouMatifou

651420

intToBits(388)

#>  [1] 00 00 01 00 00 00 00 01 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00

#> [24] 00 00 00 00 00 00 00 00 00

share|improve this question

asked 10 mins ago

MatifouMatifou

651420

share|improve this question

asked 10 mins ago

MatifouMatifou

651420

asked 10 mins ago

MatifouMatifou

651420

asked 10 mins ago

MatifouMatifou

651420