Digitizing Map - Google Earth Settings

[Manasi]

I have few more questions.

1) Do I need to digitize at different heights. Because when I kept increasing the height (absolute, Relative to Ground, Relative to Sealevel), the polygon's pattern changes.


2) Which one is preferable?
Clamped to Ground
Clamped to Sealevel
Absolute
Relative to Ground
Relative to Sealevel

3) Do I need to key in the elevation into altitude. Or leave it at 0.
Thank you

[Rogier]

Dear Manasi,
I am not sure if I get your question correct, but if you are trying to digitize a roughness map, it is not supposed to depend on height. If you see a forest in whatever you are using to digitize you would put a certain roughness area there using the map editor. If you are trying the digitize an elevation map you just have to assign the height above sea level to the line.
Best regards,
Rogier