Terra MODIS land surface temperature data from the MOD11B2 product over Tibet, June 17 - 24, 2020.View full-size image
The Terra Moderate Resolution Imaging Spectroradiometer (MODIS) Land Surface Temperature/Emissivity 8-Day (MOD11B2) Version 6.1 product provides an average 8-day per pixel Land Surface Temperature and Emissivity (LST&E) in a 1,200 by 1,200 kilometer (km) tile with a pixel size of 5,600 meters (m). Each temperature and emissivity pixel value in the MOD11B2 is a simple average of all the corresponding values from the LST&E values from the MOD11B1 product collected during that 8-day period. Each MOD11B2 granule consists of 19 layers including daytime and nighttime layers for LSTs, quality control assessments, observation times, view zenith angles, and number of clear sky observations along with percentage of land in the tile and emissivities from bands 20, 22, 23, 29, 31, and 32. Unique to the MOD11B products are additional day and night LST layers generated from band 31 of the corresponding 1 km MOD11_L2 swath product aggregated to the 6 km grid.
|File Size||~0.2 MB|
|Temporal Extent||2000-02-18 to Present|
|Geographic Dimensions||1200 km x 1200 km|
|Number of Science Dataset (SDS) Layers||19|
|Columns/Rows||200 x 200|
|Pixel Size||5600 m|
|SDS Name||Description||Units||Data Type||Fill Value||No Data Value||Valid Range||Scale Factor||Offset|
|LST_Day_6km||Daytime Land Surface Temperature||Kelvin||16-bit unsigned integer||0||N/A||7500 to 65535||0.02||N/A|
|QC_Day||Daytime LST Quality Indicators||Bit Field||8-bit unsigned integer||N/A||N/A||0 to 255||N/A||N/A|
|Day_view_time||Local time of day observation||Hours||8-bit unsigned integer||255||N/A||0 to 240||0.1||N/A|
|Day_view_angl||View zenith angle of day observation||Degree||8-bit unsigned integer||255||N/A||0 to 130||N/A||-65|
|LST_Night_6km||Nighttime Land Surface Temperature||Kelvin||16-bit unsigned integer||0||N/A||7500 to 65535||0.02||N/A|
|QC_Night||Nighttime LST Quality indicators||Bit Field||8-bit unsigned integer||N/A||N/A||0 to 255||N/A||N/A|
|Night_view_time||Local time of night observation||Hours||8-bit unsigned integer||255||N/A||0 to 240||0.1||N/A|
|Night_view_angl||View zenith angle of night observation||Degree||8-bit unsigned integer||255||N/A||0 to 130||N/A||-65|
|Emis_20||Band 20 emissivity||N/A||8-bit unsigned integer||0||N/A||1 to 255||0.002||0.49|
|Emis_22||Band 22emissivity||N/A||8-bit unsigned integer||0||N/A||1 to 255||0.002||0.49|
|Emis_23||Band 23 emissivity||N/A||8-bit unsigned integer||0||N/A||1 to 255||0.002||0.49|
|Emis_29||Band 29 emissivity||N/A||8-bit unsigned integer||0||N/A||1 to 255||0.002||0.49|
|Emis_31||Band 31 emissivity||N/A||8-bit unsigned integer||0||N/A||1 to 255||0.002||0.49|
|Emis_32||Band 32 emissivity||N/A||8-bit unsigned integer||0||N/A||1 to 255||0.002||0.49|
|LST_Day_6km_Aggregated_from_1km||Daytime LST aggregated from 1km||N/A||16-bit unsigned integer||0||N/A||7500 to 65535||0.02||N/A|
|LST_Night_6km_Aggregated_from_1km||Nighttime LST aggregated from 1km||Kelvin||16-bit unsigned integer||0||N/A||7500 to 65535||0.02||N/A|
|Clear_sky_days||Days in clear sky condition||Bit Field||8-bit unsigned integer||N/A||N/A||0 to 255||N/A||N/A|
|Clear_sky_nights||Nights in clear sky condition||Bit Field||8-bit unsigned integer||N/A||N/A||0 to 255||N/A||N/A|
|Percent_land_in_grid||Percentage of land in the grid||Percent||8-bit unsigned integer||0||N/A||1 to 100||N/A||N/A|
The Quality Control (QC) layers are stored in an efficient bit-encoded manner. The unpack_sds_bits executable from the LDOPE Tools is available to the user community to help parse and interpret the QC layers.
The QA bit flags for the QC layers are provided in Table 20 of the User Guide.
Quality assurance information should be considered when determining the usability of data for a particular science application. The ArcGIS MODIS-VIIRS Python Toolbox contains tools capable of decoding quality data layers while producing thematic quality raster files for each quality attribute.
For complete information about known issues please refer to the MODIS/VIIRS Land Quality Assessment website.