Contour interval
Contour interval
contour lines
the elevation difference between two adjacent contour lines.
The elevation difference between two adjacent lines.
the elevation difference between two adjacent contour lines.
Color
Contour interval.
A contour line is an imaginary line connecting point of equal elevation. Going from one line to an adjacent line is a change in slope.
Elevation
Hydrologic floodplain, the land adjacent to the baseflow channel residing below bankfull elevation. It is inundated about two years out of three. Not every stream corridor has a hydrologic floodplain.Topographic floodplain, the land adjacent to the channel including the hydrologic floodplain and other lands up to an elevation based on the elevation reached by a flood peak of a given frequency; for example, the 1-percent (100 year) floodplain.Another way to look at it, in an incising channel, that is to say that the river is cutting into valley, will create two floodplain benches, the lower and narrow one the hydrologic floodplain and the higher and much wider one the topographical floodplain.
Contour numbers.
Contour lines were first used in the Schiehallion Experiment. This was an experiment designed to find the mass of a mountain, and by calculation, the mass of the Earth!!Contour lines were invented by Charles Hutton, in 1774, as a method of determining (in that case) the volume of the mountain.They are now commonly shown on topographic maps as a method of indicating the shape of the land and the depths of lakes and the sea. The intervals vary according to the need of the map, but common 1:50 000 maps have then indicated every 20 m, with the 100m lines shown slightly bolder.