How to create 3d model map with exact heights

[mihai.s]

Learn about “Projected texture”

Drape aerial foto onto terrain, AND on/off foto on terrain on a different layer

Animated version of g.h.hubbers: import photo as Image; [ter-02]

and about what Eric recommended to you

How to create 3d model map with exact heights

This is SketchUp’s official course on Landscape / Site Design. Specific to your needs is Course 2, Terrain & Grading. https://learn.sketchup.com/track/sketchup-landscape-site-design