I feel like these would look even better if there was a proper gradation of height on the contour lines, like this:
Show Image
(https://images.squarespace-cdn.com/content/v1/5214613de4b0857a56a097d2/1380700153100-B09OEKVXZ20E0FORB9T7/ke17ZwdGBToddI8pDm48kMy7hnkaKPxqfyykemMTaR8UqsxRUqqbr1mOJYKfIPR7LoDQ9mXPOjoJoqy81S2I8N_N4V1vUb5AoIIIbLZhVYxCRW4BPu10St3TBAUQYVKcBVGMQvMH6doB92CWVZ2Vzhvo_WInkO-D8Hmk3WzkpUVtoRdEloBecWX7HZpnDdvY/3d+wood+chartNGTB-D2L-ZOOM-ON-DEPTH.jpg?format=500w)
I'll try it out! I experimented with it before it had the border and I didn't like the result, but it might work with the border now.