00:01
Hi everyone, welcome to this lesson.
00:03
In this question, we are going to discuss the characteristics of contour lines.
00:07
So first of all, contour line is closer near the top of a hill, a high ground, or a wide apart near the foot.
00:17
This indicates a very steep slope towards the peak and flatter slope towards the foot.
00:23
So it is something like this, like this, right? the second characteristic is that if we have lines like this, all right, so contour lines in closure near the bank of a pond or depression and wide apart towards the center.
00:57
This indicates a steep slope near the bank and the flatter slope at the center.
01:02
The third characteristic is uniformly spaced contour lines indicates a uniform slope.
01:12
The fourth one is something like this.
01:28
Contor lines always form a closed circuit but this line may be within or maybe within the circuit or outside the circuit, outside the limit of the map, let us say.
01:45
The fifth characteristic is that if we have a cliff like this, let us say this is our point a and this is our point b.
01:58
And how can we show it on the contour map? so, contour line cannot cross each other, another cannot cross one another except in the case of overhanding cliff.
02:25
But the overlapping portion must be shown by a daughter line as i showed you here.
02:32
And the next characteristic is when higher values are inside ridge line, it indicates a ridge line like this.
02:46
Let us say this is our 100 this is 99 this is 98 this is our ridge line when higher values are inside ridge line indicates a ridge line a contour line cross ridge line at the right angle in the 7th characteristic we have when lower values are inside the loop it indicates a valley line at the right angle...