How to calculate gradient on a topographic map. The closer together the gradient lines the steeper the ascent the further apart the more gentle the elevation. Slope calculation from contour lines in a topographic map. Slope is typically expressed as a percentage an angle or a ratiothe average slope of a terrain feature can conveniently be calculated from contour lines.
In order to calculate the gradient of a slope the vertical increase rise as well as the horizontal equivalent run of the two points need to be first. The first thing to remember when you want to calculate a gradient on a topographic map is that the two terms gradient and slope are interchangeable. Steep gradients are indicated on a topographical map by use of gradient lines.
Point a 1120m and point b 1380m. On a map the rise is the difference in elevation between two points. To calculate slope of the land from contour maps one still needs to determine the rise and run.
The rise is the difference in elevation between two points. Enjoy the videos and music you love upload original content and share it all with friends family and the world on youtube. Slope can be given in two different ways a percent gradient or an angle of the slope.
Gradient grade incline and pitch are used interchangably with slope. How to calculate gradient on a topographic map. Map distance is always horizontal distance.
On topographic maps gradient is usually calculated with reference to two points. Use the following formula. The run is the horizontal distance between two points.
In turn this helps geologists and environmentalists determine any effect. The initial steps to calculating slope either way are the same. Topographical maps are very useful tools when analyzing geological elevations and structures in an area.
Determining the average slope of a hill using a topographic map is fairly simple. The gradient change occurring within a specific area on the map reveals the lay of the land.