MODIS#

MODIS (or Moderate Resolution Imaging Spectroradiometer) is a key instrument aboard the Terra (originally known as EOS AM-1) and Aqua (originally known as EOS PM-1) satellites. Terra MODIS and Aqua MODIS are viewing the entire Earth’s surface every 1 to 2 days, acquiring data in 36 spectral bands, or groups of wavelengths (see MODIS Technical Specifications). These data will improve our understanding of global dynamics and processes occurring on the land, in the oceans, and in the lower atmosphere.

There are so many MODIS products, complete list ara available here https://modis.gsfc.nasa.gov/data/dataprod/.

  • MOD11A1

    The MOD11A1 V6 product provides daily land surface temperature (LST) and emissivity values in a 1200 x 1200 kilometer grid. The temperature value is derived from the MOD11_L2 swath product. Above 30 degrees latitude, some pixels may have multiple observations where the criteria for clear-sky are met. When this occurs, the pixel value is the average of all qualifying observations. Provided along with both the day-time and night-time surface temperature bands and their quality indicator layers are MODIS bands 31 and 32 and six observation layers.

    modis

    About the data

    Characteristic

    Description

    Function

    Displays daily day and nighttime LST

    Variable

    Listed below

    Geographic coverage

    Global 90N-90S, 180W-180E

    Spatial resolution

    1-km at equator

    Temporal resolution

    daily

    Original format

    HDF-EOS

    Unit

    See list below


    List datasets


    We are utilising Google Earth Engine (GEE) to get MOD11A1 data, and below are list of MOD11A1 bands that available at GEE.


    Name

    Description

    —

    —

    LST_Day_1km

    Daytime Land Surface Temperature

    QC_Day

    Daytime LST Quality Indicators

    Day_view_time

    Local time of day observation

    Day_view_angle

    View zenith angle of day observation

    LST_Night_1km

    Nighttime Land Surface Temperature

    QC_Night

    Nighttime LST Quality Indicators

    Night_view_time

    Local time of night observation

    Night_view_angle

    View zenith angle of night observation

    Emis_31

    Band 31 emissivity

    Emis_32

    Band 32 emissivity

    Clear_day_cov

    Day clear-sky coverage

    Clear_night_cov

    Night clear-sky coverage


    We wrote a GEE code to get some variables that required by the team for different purposes. Currently we have data covering Indonesia and Latin America Countries, and the variables are listed below:


    Variables

    Units

    —

    —

    Annual 24h mean LST

    degC

    Annual daytime mean LST

    degC

    Number of annual hotdays based on 24h mean daily LST

    days

    Number of annual hotdays based on daytime daily LST

    days


    Symbology


    The threshold and the symbology for the daily land surface temperature in degree celcius (°C) can follow below colorcodes and image.


    Class

    Hex

    —

    —

    -40 and below

    #b2182b #b2182b

    -40 to -30

    #d6604d #d6604d

    -30 to -20

    #f4a582 #f4a582

    -20 to -10

    #fddbc7 #fddbc7

    -10 to +10

    #f7f7f7 #f7f7f7

    +10 to +20

    #d1e5f0 #d1e5f0

    +20 to +30

    #92c5de #92c5de

    +30 to +40

    #4393c3 #4393c3

    +40 and above

    #2166ac #2166ac


Data access

Annual temperature and hotdays also available at DEC S3: s3://wbgdecinternal-ntl/climate/data/modis/mod11a1/annual.