[geodesy]
A vector used to determine the maximum amount of vertical change on a surface and the direction in which that change occurs. Can also be expressed as the ratio, or percentage, between vertical distance (rise) and horizontal distance (run). A 10-percent gradient rises 10 feet for every 100 feet of horizontal distance.
[geodesy]
The inclination of a surface in a given direction.
[physics]
The rate at which a quantity such as temperature or pressure changes in value.
[graphics (map display)]
The interpolated transition of thematic color between fixed colors.