| A | B |
|---|
| Contour line | an isoline connecting points of equal elevation |
| Contour interval | the change in evaluation between two adjacent contour lines |
| Coordinate system | a series of scaled magnitudes used to locate a position on a grid (latitude |
| Isoline | a line on a field map connecting points of the same value |
| Isobar | a line on a map connecting points that have the same atmospheric pressure |
| Topography | the relief features or surface configuration of an area (lay of the land) |
| Topographic map | maps of an elevation field that use contour lines to connect points of equal elevation. Show natural and man-made features |
| field | a region of space that has measurable value of a given property at every point |
| gradient | change in a field value divided by distance |
