How do you construct a graph using landmarks?

Graphs are more to present data. For example, if you wanted to organize and list mountains by their heights. You would need to mentally organize your data, or put each item on an index card so you can move them around to organize the data. Then, pick the type of graph you need to use to best represent the data you have.

If you mean construct an image or a depiction, it would be like any other drawing, with or without labels.