I am trying to create shapefiles of the water extent of a lake overtime. I have downloaded the multispectral band Landsat 7 data for the timeperiod (2000-2022). Is there a way of digitising the water extent without manually clicking around each month's data? I have produced a raster layer of the NDWI (band2 -band4/Band 2 + Band4 ) but still can't remove the background non lake area from the file.
Any ideas or suggestions would be most welcome.