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the difference between contour interval and vertical interval is that that the contour intervals are the difference in elevation between 2 successive contours whereas the vertical intervals is the distance between any two contours .

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Vertical interval and contour interval are both terms used in the context of cartography and geography, particularly while discussing maps and terrain representation.

Vertical interval:

• The Vertical line refers to the difference in elevation between 2 points or features on the earth's surface.
• It's measuring units are feet or meters.
• It is often used in the context of topographic maps or DEMs to indicate the Vertical spacing between contour lines or elevation points.

Contour interval:

• It specifically refers to the difference in elevation between adjacent contour lines on a topographic map.
• These are imaginary lines that connects points of equal elevation on the earth's surface.

The actual difference is, the Vertical interval refers to the actual difference in elevation between points or features on the ground, while the contour interval refers to the standardized elevation difference represented by each contour line on map.