GIS Dictionary

hachure

A short line on a map that indicates the direction and steepness of a slope. Hachures that represent steep slopes ...

HARN

Acronym for High Accuracy Reference Network. A regional or statewide resurvey and readjustment of NAD 1983 control points using ...

hatch style

In linear referencing, an organized collection of symbols and settings for the hatch definitions that make up a ...

hatches

In linear referencing, a series of vertical line or marker symbols displayed on top of features at an ...

hatching

In linear referencing, a type of labeling that posts and labels hatches or symbols at a regular interval ...

HDOP

Acronym for horizontal dilution of precision. A measure of the geometric quality of a GPS satellite configuration in the ...

heap

In computer programming, a variation on the binary tree data structure in which each node's value is greater than ...

hectare

A metric areal unit of measure equal to 10,000 square meters. One hectare is equal to 100 ares or ...

Help Node

In ArcGIS 8.3 and previous versions, a branch in the ArcToolbox tree providing overview help for ArcToolbox toolsets.

heuristic

In computer science, an algorithm that incorporates a shortcut or simplification for solving a programming problem, such as searching. ...

histogram

A graph showing the distribution of values in a set of data. Individual values are displayed along a horizontal ...

HKCR

HKEY_CLASSES_ROOT registry hive. A Windows registry root key that points to the HKEY_LOCAL_MACHINE\Software\Classes registry key. It displays essential ...

hole

A small gap in a raster line feature, usually considered to be an error caused by the poor ...

honor

In network datasets, a type of junction connectivity policy in which junctions connect to other junctions based on ...

horizon

1 The apparent or visible junction of land and sky. 2 The horizontal plane tangent to the earth's ...

host

1 In a computer network, the computer that contains data being accessed by other computers. 2 A computer ...

HRESULT

A 32-bit integer returned from any member of a COM interface indicating success or failure, often written in ...

HSV

A color model that uses hue, saturation, and value. Hue specifies the perceived color, such as red ...

HTML

Acronym for Hypertext Markup Language. A markup language used to create Web pages for publication on the Internet. HTML ...

HTTP

Acronym for Hypertext Transfer Protocol. The protocol maintained by the World Wide Web Consortium for communicating between servers and ...

HTTPS

Acronym for Hypertext Transfer Protocol (Secure). A variant of HTTP enhanced by a security mechanism. It allows transactions such ...

hue

The dominant wavelength of a color, by which it can be distinguished as red, green, yellow, blue, and so forth.

hydrography

The measurement and description of water features and their related land areas for the purposes of safe marine navigation.

hydrology

The study of water, its behavior, and its movements across and below the surface of the earth, and through the ...

hyperlink

A reference (link) from one point in an electronic document to another document or another location in the same document ...

hypsometry

1 The science that determines the spatial distribution of elevations above an established datum, usually sea level. 2 ...