![]() But once you've strayed from the road, perhaps on a backpacking trek or hike, you will need to use the terrain and the contours of the land as reference, meaning that you need to be able to read a topographic map. for example, in order to drive from Point A to Point B, a regular road map will be useful. In short, contour interval is a vertical distance or difference in height between contour lines whereas index controls are bold or thick lines that appear on each fifth contour line.There are different kinds of maps, that serve different purposes. Also read: Chain Surveying, Tacheometry, Plane Table Surveying & Total Station Conclusion:
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