GIS Dictionary

A short line on a map that indicates the direction and steepness of a slope. Hachures that represent steep slopes are short and close together; hachures that represent gentle slopes … Read more

[symbology] On a topographic map, concentric contour lines drawn with hachures to indicate a closed depression or basin. Concentric contour lines drawn without hachure marks indicate a hill.

[printing] A continuous tone image photographed through a fine screen that converts it into uniformly spaced dots of varying size while maintaining the gradations of highlight and shadow. The size … Read more

A path through a network that visits each junction in the network only once and then returns to its point of origin. Hamiltonian circuits are named after the Irish mathematician, … Read more

A path through a network that visits each junction in the network only once without returning to its point of origin. Hamiltonian paths are named after the Irish mathematician, physicist, … Read more

[hardware] A small hardware device that provides the unique number used in the generation of a license file. The key is plugged into either the parallel or USB port on … Read more

[geodesy] Acronym for High Accuracy Reference Network. A regional or statewide resurvey and readjustment of NAD 1983 control points using GPS techniques. The resurvey date is often included as part … Read more

[linear referencing] In linear referencing, a group or category of hatch definitions.

[linear referencing] In linear referencing, a specification for where hatch marks are drawn on a line feature. Each hatch definition has its own set of properties that include the multiple … Read more

[linear referencing] In linear referencing, an organized collection of symbols and settings for the hatch definitions that make up a hatch class. Hatch styles are stored in a style file … Read more

[linear referencing] In linear referencing, a series of vertical line or marker symbols displayed on top of features at an interval specified in route measure units.

[linear referencing] In linear referencing, a type of labeling that posts and labels hatches or symbols at a regular interval along measured line features.