Understanding Contour Interval and Terrain Precision

The contour interval represents the vertical distance in elevation between adjacent contour lines on a map. It is a crucial factor in determining the level of detail shown for terrain relief.

Impact of Contour Interval Size on Precision

For achieving a more precise prediction of terrain relief, the contour interval needs to provide finer detail about the landscape's shape and elevation changes.

• Smaller Contour Interval: When the contour interval is small, contour lines are placed closer together on the map, indicating smaller changes in elevation over a given horizontal distance. This results in a more detailed and accurate representation of slopes, valleys, and ridges.
• Larger Contour Interval: Conversely, a larger interval results in fewer contour lines, representing greater elevation changes between lines. This provides a more generalized view of the terrain, sacrificing precision for simplicity, especially in areas with significant topographical variation.

Analysis of Options for Precision

To enhance the precision of terrain relief prediction, the contour interval should reflect smaller elevation differences. This means the interval needs to become smaller.

• "decrease continuously": This option suggests a process of reducing the interval size. Continuously decreasing the contour interval leads to progressively more contour lines being drawn, capturing finer details of the terrain and thus increasing the precision of the representation.
• "be smaller": This describes the state required for precision – a small interval.
• "increase continuously" / "be larger": These options would lead to less detail and lower precision.

Therefore, for more precise terrain relief prediction, the contour interval should decrease continuously, allowing for a more detailed representation of the landforms.