The evolution of Colombo harbor and Colombo port city seen from space using a timelapse animation of annual Landsat imagery (2001 to 2021).
Satellite image - Landsat TM-ETM-OLI Surface Reflectance.
RGB band combination - SWIR1/NIR/Red
NIR – water absorbs almost all light at the wavelength this makes the water bodies appear very dark. The contrasts with the soil and vegetation bright reflectance make it a good band for the definition of water/land interface.
SWIR1 – This band is very sensitive to moisture and is, therefore, it is used to indicate and monitor the vegetation and soil moisture in the image.
Red – vegetation absorbs almost all the red light in the band. It is used to distinguish between soil and vegetation and also vegetation health. (Source - https://eos.com/make-an-analysis/land-water/)
Coding - https://github.com/giswqs/geemap/blob/master/examples/notebooks/39_timelapse.ipynb
