Contour interval
It would be the difference between the two darker lines, or index lines, and then divide the space in between with your difference.
A topographic map shows equal lines of elevation, in set distances which can vary between maps (dependent on the grade of elevation change). elevation,relief,and slope.
I believe it is a Thematic map.
Topographic Maps
The spaces between the topographic lines are called contour intervals. They represent the difference in elevation between each line on a topographic map.
Contour interval
Contour interval
A topographical map shows elevations. They are more useful than other types of maps when looking for information about landforms, their locations, and their heights.
To calculate the total relief on a topographic map, subtract the elevation of the lowest contour line from the elevation of the highest contour line within the map area. This difference represents the total vertical distance between the highest and lowest points on the map.
It would be the difference between the two darker lines, or index lines, and then divide the space in between with your difference.
The relief is the difference between the highest and lowest contour line.
The contour lines on a topographic map represent the difference in elevation between two adjacent lines. The closer together the contour lines are, the steeper the terrain. If the lines are spaced far apart, it indicates a gentle slope. The contour interval, which is typically shown in the map's legend, specifies the difference in elevation between each contour line.
A topographic map shows equal lines of elevation, in set distances which can vary between maps (dependent on the grade of elevation change). elevation,relief,and slope.
The difference in elevation between two side-by-side contour lines on a topographic map is called the contour interval. It represents the vertical distance between each contour line and helps depict the steepness of the terrain.
What I need is a topographic map!
the difference in elevation represented by each contour line on a topographic map