Techniques to map small water bodies in desert
I have task to map water bodies in a desert. I used landsat 8 and calculated three indices called NDMI, Tasseled Cap Wetness, & AWEIsh. I am unable to map outlines water bodies as those appear in satellite view of GEE. Screenshot, kml file and code link attached. I used threshold values from literature even Ostu segmentation to find optimal threshold.
What I should do to get map water bodies along with their natural boundaries? Unmixing? High spatial resolution data? Other image classification technique? use https://imagej.nih.gov/ij/plugins/versatile-wand-tool/index.html