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Hey everybody this JJ and this is going to be a real quick lesson on how to read contour lines, and unfortunately I haven't figured out a great way to do this and to show you the graphic representations so that it makes it easy to understand so what I've gone to is just basically taken some images from some old survival manuals, so that is going to be what we're going to take a look at here first okay so essentially contour lines basically measure the distance from sea level they measure elevation, but their shape also gives you an indication of what kind of terrain feature you're looking at now there are three different kinds of contour lines you have the index contour line which as you see in this picture here has the elevation marked on it then you have what is the most common that you'll see the most of is the intermediate contour lines and those are not labeled, and then you'll have the dotted supplementary lines now supplementary lines are generally only used when you have kind of a flat elevation okay so contour lines as you can see in this picture here are basically what is enables you to determine elevation when you're looking at a 3d object like the hills on the top you can see how you can look how you can read that in a 2d form down at the bottom, so contour lines are basically just like it looks in a picture they're basically a big for lack of a better word circles you know that follow the same elevation around a contour feature and no matter how weird shaped a mountain is or whatever their contour line is always going to close back into itself because it follows that same line of elevation, and you can determine what a terrain feature you're looking at based on the shape of those contour features, and so we'll go ahead and get started with the most basic of those which is the peak okay this is a representation of a peak you've got a side view on the top, and then you have what it might look like on a map down at the bottom and if you notice where the little on the bottom where that little triangle is that is the center of the peak now what denotes the actual peak is the smallest enclosed circle on that picture that does not have any other contour lines inside it and that would that smallest circle is what's going to tell you that's the very top of the peak the triangle doesn't necessarily it's not on all Peaks so don't use that as a reference it's basically just the small enclosed circle and that's going to let you know at the very top of that terrain feature ok so here's another look at a peak just a basic Hill and the picture on the right is what it would look like from the ground and then the picture on the left is what you would see on the map and just how the contour lines would you know be shaped and that kind of thing and the very inner circle is the top of that peak again it's a small and close circle with no other contour lines inside it that is the top of the hill okay, so the distance between contour lines also gives you...
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