MYD11_L2 v006

MODIS/Aqua Land Surface Temperature/Emissivity 5-Minute L2 Swath 1 km


PI: Zhengming Wan

Description

The MYD11_L2 Version 6 swath product provides per-pixel Land Surface Temperature and Emissivity (LST&E) with a pixel size of 1,000 meters (m). The product is produced daily in 5-minute temporal increments of satellite acquisition using the generalized split-window algorithm. MYD11_L2 is a Level 2 product which provides the input for the Level 3 products. Provided in each MYD11_L2 file are LST, quality control assessment, error estimates, bands 31 and 32 emissivities, zenith angle of the pixel view, observation time, and the geographic coordinates for every five scan lines and samples.

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Characteristics

Improvements/Changes from Previous Versions

  • Removed cloud-contaminated LSTs from Level 2 and Level 3 LST products.
  • Updated the coefficient look-up table (LUT) for the split-window algorithm with comprehensive regression analysis of Moderate Resolution Imaging Spectroradiometer (MODIS) simulation data in bands 31 and 32 over wide ranges of surface and atmospheric conditions, especially extending the upper boundary for (LST – Ts-air) in arid and semi-arid regions. Increased the overlap between various sub-ranges to reduce the sensitivity of the algorithm to uncertainties in the input data (i.e., column water vapor and air surface temperature from MYD07).
  • Made minor adjustments in the classification-based surface emissivity values, especially for bare soil and rocks land cover types.
  • Tuned the day/night algorithm by adjusting weights to improve performance in desert regions where the incorporated split-window algorithm may not work well.
  • Generated new gridded LST&E products with a 6 km spatial resolution for 8-day (MYD11B2) and monthly (MYD11B3) intervals in response to user community requests.

Product Maturity

Validation at stage 2 has been achieved for all MYD11 LST&E products.

Collection and Granule

Collection

Characteristic Description
CollectionAqua MODIS
DOI10.5067/MODIS/MYD11_L2.006
File Size~2.4 MB
Temporal Resolution< Daily
Temporal Extent2002-07-04 to Present
Spatial ExtentGlobal
Coordinate SystemNone (Swath)
DatumN/A
File FormatHDF-EOS
Geographic Dimensions2330 km x 2000 km

Granule

Characteristic Description
Number of Science Dataset (SDS) Layers9
Columns/Rows2030 x 1354
Pixel Size1000 m

Layers

SDS Name Description Units Data Type Fill Value No Data Value Valid Range Scale Factor Additional Offset
LST Land Surface Temperature Kelvin 16-bit unsigned integer 0 N/A 7500 to 65535 0.02 N/A
QC Quality control for daytime LST and emissivity Bit Field 16-bit unsigned integer N/A N/A 0 to 65535 N/A N/A
Error_LST Land Surface Temperature Error Kelvin 8-bit unsigned integer 0 N/A 1 to 255 0.04 N/A
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
View_angle Zenith angle of MODIS viewing at the pixel Degree 8-bit unsigned integer 255 N/A 0 to 180 0.5 N/A
View_time Local time of pixel observation Hours 8-bit unsigned integer 255 N/A 0 to 240 0.1 N/A
Latitude Latitude of every 5 scan lines and 5 pixels Degree 32-bit floating point -999 N/A -90 to 90 N/A N/A
Longitude Longitude of every 5 scan lines and 5 pixels Degree 32-bit floating point -999 N/A -180 to 180 N/A N/A

Product Quality

The Quality Control (QC) layer is 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 layer.

The QA bit flags for the QC layers are provided in the User Guide in Table 8 on page 15.

Known Issues

For complete information about the MYD11_L2 known issues please refer to the MODIS Land Quality Assessment website.

Documentation

Using the Data

E-Learning

Getting Started with MODIS Version 6 Land Surface Temperature Data Part 3: Interpreting Quality Information

Tools

Citation

DOI: 10.5067/MODIS/MYD11_L2.006

About the Image

Aqua MODIS land surface temperature data from the MYD11_L2 over Tibet, July 15, 2018.

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