| Webster's Online Dictionary |
| Expressions | Domain | Definition | |
| Index contour | Environment | A contour line shown distinctively for easy identification and generally labeled with the elevation value. (references) | |
| Index contour | Mining | A contour line shown on a map in a distinctive manner for ease of identification, being printed more heavily than other contour lines and generally labeled with a value (such as figure of elevation) along its course. It appears at regular intervals, such as every fifth or sometimes every fourth contour line (depending on the contour interval). Syn: accented contour. (references) | |
| Index contour line | Military | A contour line accentuated by a heavier line weight to distinguish it from intermediate contour lines. Index contours are usually shown as every fifth contour with their assigned values, to facilitate reading elevations. (references) | |
Source: compiled by the editor from various references; see credits. | Top | ||
