I want to create a watershed boundary for a lake only using google earth without using other source of data like srtm etc.

Since we get the height of the location can we use it somehow and create a watershed boundary with effort than digitizing?

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Well watershed is quite advanced spatial analysis and I really doubt that Google Earth is focused on this kind of things. I have to say I am not using GE often, but after quick look at capabilities of pro version I would say it is not possible.

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