Capt Quirk
Veteran
Start with Google Earth maybe?
Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
HI Anhar,try terragen, I think it may support GIS data, in which case it would be the prefered way to generate vast and accurate landscape in 3D (why re-invent the wheel?)
Anhar