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MODIS 1km Daily Surface Reflectance State QA Science Data Sets
The QA information below is excerpted from the MODIS Surface Reflectance Users Guide available on-line at http://tbrs.arizona.edu/project/MODIS/UserGuide_doc.php . All information can be assumed applicable to both Terra (MOD09GST) and Aqua (MYD09GST) Surface Reflectance products.
An index to data in each of the bitmapped state QA SDSs, "state_1km_1", "state_1km_f" and "state_1km_c" follows:state_1km:
| Bit | Description |
| 0-1 | cloud state; 00 -- clear 01 -- cloudy 10 -- mixed 11 -- not set, assumed clear |
| 2 | cloud shadow; 0 -- no 1 -- yes |
| 3-5 | land/water flag; class definitions; 000 -- shallow ocean 001 -- land 010 -- ocean coastlines and land shorelines 011 -- shallow inland water 100 -- ephemeral water 101 -- deep inland water 110 -- continental/moderate ocean 111 -- deep ocean |
| 6-7 | aerosol quality; 00 -- climatology 01 -- low 10 -- average 11 -- high |
| 8-9 | cirrus detected; 00 -- none 01 -- small 10 -- average 11 -- high |
| 10 | PGE11 cloud algorithm flag; 0 -- clear 1 -- cloudy |
| 11 | PGE11 fire algorithm flag; 0 -- no fire 1 -- fire |
| 12 | MOD35 snow/ice flag; 0 -- no 1 -- yes |
| 13-14 | BRDF correction performed; 00 -- no 01 -- Montana methodology 10 -- Boston methodology |
| 15 | PGE11 snow algorithm flag; 0 -- no snow 1 -- snow |
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