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MODIS Land Surface Temperature/Emissivity 1km QA Science Data Sets
The QA information below is excerpted from the MODIS Land Surface Temperature/Emissivity Users Guide available on-line at http://www.icess.ucsb.edu/modis/LstUsrGuide/usrguide.html. All information can be assumed applicable to both Terra (MOD11) and Aqua (MYD11) LST/E products.
The following description applies to the Daily and 8-Day 1km LST/E products.
The QC SDS in the data product provides information on algorithm results for each pixel. The QC SDS 16-bit data are stored as bit flags in the SDS. This QC information can be extracted by reading the bits in the 16-bit unsigned integer. The purpose of the QC SDS is to give the user information on algorithm results for each pixel that can be viewed in a spatial context. The QC information tells if algorithm results were nominal, abnormal, or if other defined conditions were encountered for a pixel. The QC information should be used to help determine the usefulness of the LST data for a user's needs. The bit flags in the QC SDS are listed below .
Bit flags defined for SDSs QC_day and QC_Night.
| bit | Long Name | Key |
| 00-01 | Mandatory QA flags | 00=LST produced, good
quality, not necessary to examine more detailed QA 01=LST produced, other quality, recommend examination of more detailed QA 10=LST not produced due to cloud effects 11=LST not produced primarily due to reasons other than cloud |
| 02-03 | Data quality flag | 00=good data quality 01=other quality data 10=TBD 11=TBD |
| 04-05 | Emis Error flag | 00=average emissivity
error <= 0.01 01=average emissivity error <= 0.02 10=average emissivity error <= 0.04 11=average emissivity error > 0.04 |
| 06-07 | LST LST Error flag | 00=average LST error
<= 1K 01=average LST error <= 2K 10=average LST error <= 3K 11=average LST error > 3K |
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