What is Modis LST?

Overview. The Land Surface Temperature (LST) and Emissivity daily data are retrieved at 1km pixels by the generalized split-window algorithm and at 6km grids by the day/night algorithm.

How is LST measured?

It is estimated from Top-of-Atmosphere brightness temperatures from the infrared spectral channels of a constellation of geostationary satellites (Meteosat Second Generation, GOES, MTSAT/Himawari). Its estimation further depends on the albedo, the vegetation cover and the soil moisture.

What inputs does Modis use to model Emissivity values?

The band 31 and 32 emissivities are estimated by a classification-based emissivity method, which relies on the pixel’s land cover type as determined by the land and snow cover inputs.

What is scale factor in Modis?

The scale factor is 0.0001.

What is split window algorithm?

The split-window algorithm (SWA) is the most popular method for LST retrieval from satellite data. The SWA takes advantage of the differential atmospheric absorption in two adjacent TIR channels to retrieve LST (McMillin, 1975).

What is land surface temperature?

Land surface temperature (LST) is the radiative skin temperature of the land derived from solar radiation. LST measures the emission of thermal radiance from the land surface where the incoming solar energy interacts with and heats the ground, or the surface of the canopy in vegetated areas.

Why is LST important?

LST is an important factor of climate and biosphere involving ecosystems across scales local to global. It can be defined as the emission of thermal radiance from the land surface as well as the canopy of the vegetated areas (Ahmad et al., 2006, pp.

What is LST in GIS?

Jeff Oppong | July 5, 2021 March 30, 2021 | GIS Software. Land Surface Temperature (LST) is defined by the National Aeronautics and Space Administration (NASA) Earth Observatory as how hot the “surface” of the Earth would feel to the touch in a particular location.

How do I download Modis Data in R?

Download. To download MODIS data through the NASA http server, we need to create a profile at https://urs.earthdata.nasa.gov/home to get a user and password . We need to define the out_folder to where the data are going to be downloaded.

Which factor affects the LST measurement?

Many factors affect the retrieval of LST from satellite thermal infrared data but some of them, such as transmittance, air moisture, downwelling and upwelling radiance, are usually difficult to obtain, especially from satellite observations (Figure 4 and Table 4).

Why is land surface temperature important?

About project. Land Surface Temperature is an important variable within the Earth climate system. It describes processes such as the exchange of energy and water between the land surface and atmosphere, and influences the rate and timing of plant growth.

What are the Landsat 8 bands?

Landsat 8 bands from the OLI sensor are coastal, blue, green, red, NIR, SWIR-1, SWIR-2 and cirrus. These 8 bands have a ground resolution of 30 meters. Then, the panchromatic band has a finer resolution of 15 meters.

Which band of Landsat 8 is used for temperature calculation?

Band 10
The tool was developed using the LANDSAT 8 thermal infrared sensor Band 10 data. Different methods and formulas were used in the algorithm that successfully retrieves the land surface temperature to help us study the thermal environment of the ground surface.

How do I get Modis data?

How to Download MODIS data

  1. Step 1: Define Your Study Area (AOI)
  2. Step 2: Define the Data That You Want to Download.
  3. Step 3: Define Selection Criteria.
  4. Step 4: View Results & Select Data to Order / Download.
  5. Step 5: Download Your Data.

What is LST land surface temperature?

Is Landsat 8 passive or active?

passive sensors
Quickbird, WorldView, Landsat and MODIS are all passive sensors that measure only radiation emitted by the Sun and reflected or emitted by the Earth.

How is LST calculated in Landsat 8?

How to calculate Land Surface Temperature with Landsat 8 satellite images

  1. TOA (L) = ML * Qcal + AL
  2. BT = (K2 / (ln (K1 / L) + 1)) − 273.15.
  3. NDVI = (Band 5 – Band 4) / (Band 5 + Band 4)
  4. Pv = Square ((NDVI – NDVImin) / (NDVImax – NDVImin))
  5. ε = 0.004 * Pv + 0.986.
  6. LST = (BT / (1 + (0.00115 * BT / 1.4388) * Ln(ε)))

How many bands does Landsat 8 have?

nine spectral bands
Landsat 8 Operational Land Imager (OLI) and Thermal Infrared Sensor (TIRS) images consist of nine spectral bands with a spatial resolution of 30 meters for Bands 1 to 7 and 9.

Is MODIS still active?

There are two MODIS sensors in Earth orbit: one on board the Terra (EOS AM) satellite, launched by NASA in 1999; and one on board the Aqua (EOS PM) satellite, launched in 2002. MODIS is succeeded by the VIIRS, which was first launched in 2011 aboard the Suomi NPP satellite.