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MODIS Land Surface Temperature/Emissivity Daily 5km QA Science Data Sets

The QA information below is excerpted from the MODIS Land Surface Temperature/Emissivity File Specifications available on-line at ftp://modular.nascom.nasa.gov/pub/LatestFilespecs/ All information can be assumed applicable to both Terra (MOD11) and Aqua (MYD11) LST/E products.

The QC SDSs in the data product provide information on algorithm results for each pixel. The QC SDSs are encoded as 16-bit unsigned integers. 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.

Three QC SDSs are included for 5km LST/E, QC_day, QC_Night, and QC_Emis.

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=LST affected by nearby clouds and/or sub-grid clouds and/or ocean 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

QC_Emis

bit	Long Name	Key
00-03	Nighttime view angle flag	index of the nighttime view angle sub-range
04-07	Daytime view angle flag	index of the daytime view angle sub-range

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URL: http://LPDAAC.usgs.gov/modis/qa/moyd11b1_qa_v4.asp
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Last Update: Monday, September 19, 2005
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