Hello, I am trying to process images to estimate LST in 2021 for a multitemporal analysis, however, the excess clouds do not allow me to use Landsat 8 images, fortunately Landsat 9 images are available, however the LST values when processing the information are high when working in ArcGis, however, when processing in QGis I get lower LST data for the same image, it would help me to know if any of you are already processing Landsat 9 images in multitemporal analysis and if you have observed this phenomenon.
Best regards
Hello dear
Landsat 9 sensors are newer and more advanced, and because of this, their accuracy is higher than Landsat 8 or below.
Best regards
Marina L. Jiménez Jiménez, although I've not compared L9 and L8 LST products, I assume there could be several factors that can impact the LST readings, such as the orbit and altitude of the satellite, the type of sensor and its specifications, the atmospheric conditions at the time of measurement, and the processing algorithms used to derive the temperature values. It is also possible that differences in the calibration or data processing between L9 and L8 could contribute to the discrepancy in the LST values. Differences in the performance of the two missions could lead to different results for the same location and time period. To determine the exact cause of the difference, a detailed analysis of the data and the methods used would be required.
However, L9's USGS webpage might be a good start in pointing the differences. Here is some pertinent information:
With the higher radiometric resolution, Landsat 9 can differentiate 16,384 shades of a given wavelength. In comparison, Landsat 8 provides 12-bit data and 4,096 shades, and Landsat 7 detects only 256 shades with its 8-bit resolution. In addition to the OLI-2 improvement, TIRS-2 has significantly reduced stray light compared to the Landsat 8 Thermal Infrared Sensor (TIRS) which enables improved atmospheric correction and more accurate surface temperature measurements...
https://www.usgs.gov/landsat-missions/landsat-9
There are several reasons why Landsat 9 may show higher surface temperature (LST) values than Landsat 8 in the same place and month:
Overall, the differences in LST values between Landsat 8 and 9 in the same place and month may be due to a combination of these factors, and further investigation may be necessary to determine the specific causes of the differences.
There could be several reasons why Landsat 9 shows higher surface temperature values than Landsat 8 in the same place and month, such as 1 - differences in instrument calibration, 2 - atmospheric conditions, 3 - surface characteristics, and 4 - time of day.
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