I am trying to process land surface temperature using landsat-8 images. There is overlap of scene paths cross the study area with a good deal of inconsistency due to different images having been used. Can anyone give suggestions on how to minimise the impact on the derived temperature?
If there is an overlap of Landsat 8 scene paths, they were most probably acquired on different dates. What is the time gap between the acquisition of the two (or more?) overlapping Landsat 8 scenes?
You may want to follow a similar discussion on the topic, especially the answer added by Prof. Michel https://www.researchgate.net/post/How_to_Normalize_mosaicked_Land_Surface_Temperature_Image
Question:
What could be causing the "seamline" in a mosaic of multiple images?
Answer:
In order to obtain a "seamless" mosaic, radiance (and preferably reflectance) may need to be calculated before performing the mosaic, because gain changes may occur in one or more of the scenes. When two scenes have different gain states, they have different dynamic ranges, and there will be a shift in Digital Number (DN) values from one scene to the next. This can be determined by reviewing the included metadata file for each scene.
Some imaging software packages have a utility that can automatically create the radiance image, based on the gain/bias in the header file. If this is not available, a manual "band math function" may be necessary.
Details about conversion to radiance and converting radiance to reflectance are provided in the Landsat Data Users Handbook.
Please follow this thread
https://www.researchgate.net/post/How_to_Normalize_mosaicked_Land_Surface_Temperature_Image
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