Grid coordinate system

A system of coordinates used to locate points on a grid, typically a square or rectangular grid.

Gridded data

Data that is arranged in a grid, typically a square or rectangular grid.

Ground control point

A point on the ground whose location is known, typically used as a reference point for geospatial data.

Hydrography

The branch of applied science which deals with the measurement and description of the physical features of water bodies.

Identifier For Advertising (IDFA)

A unique identifier that is assigned to a device for the purpose of tracking online advertising.

Impression

A measure of how often an advertisement is seen by a person.

Index map

A map that contains an index of other maps and their locations. The index map may be geographic, showing the locations of the other maps, or it may be topical, showing the subject matter of the other maps.

Infrastructure for Spatial Data in Europe (INSPIRE)

A directive by the European Commission that establishes an infrastructure for spatial information in Europe. The directive includes a set of technical specifications for the interoperability of spatial data.

Infrastructure for spatial information

A set of hardware, software, data, people, and procedures that are used to create, store, manipulate, analyze, and display geographic information.

Interactive Advertising Bureau (IAB)

A trade association for the digital advertising industry.