You need a higher resolution terrain. Ie. a terrain mesh with more detail.
See below - if you turn your hidden lines on you can see your model’s slope consists of just large planes. Can you get a better terrain base model to work from?
Thank you very much for your answer !! Now I understand the reason
the terrain base model is imported via Geo Location from Google Earth.
Is there a way to control the level of mesh detail which is imported?
Thanks
Rachel
All you have to do is get as close as possible to the terrain you want to capture for work:
here are grabed two snapshots from location terrain tool
here the terrains appear with their respective geometries. The more detailed terrain has so much geometry that the lines seem to come together, which shows that closer snapshots generate more geometry and so the contours will be smoother
here is a more approximate view, for comparison of the geometric lines between both lands
Note: Always work with terrain from approximate snapshots as much as possible. If you want to capture a larger area of the terrain, add more snapshots of the environment, SketchUp will understand that they are new areas and will automatically add those snapshots in their proper place with their respective coordinates
Well you still need to zoom in as the topography “resolution” or detail is linked to how close you are to the ground. This is as close as it lets you get:
eric-s, I have tried to open the file, unfortunately no success,
because I use SU 2017, while the file was created in SU 2018.
Can you please save the file as SU 2017, and send it again ?