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Photogrammetry

Use of aerial photographs to produce planimetric and topographic maps of the earth`s surface and of features of the built environment. Effective photogrammetry makes use of ground control by which aerial photographs are carefully compared and registered to the locations and characteristics of features identified in ground-level surveys.

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Publish, Find, Bind

In the context of Web Services, publish means to advertise data and services to a broker (such as registry, catalog or clearinghouse). A service provider contacts the service broker to publish (or unpublish) a service. A service provider typically publishes to the broker metadata describing its capabilities and network address. Find is used by service requestors to locate specific service types or instances. Service requestors describe the kinds of services they're looking for to the broker and the broker responds by delivering results that match the request. Service requestors typically use metadata published to the broker to find service providers of interest. Bind results after a service requestor and a service provider successfully negotiate so the requestor can access and invoke services of the provider. A service requestor typically uses service metadata provided by the broker to bind to a service provider. The service requestor can either use a proxy generator to generate the code that can bind to the service, or can use the service description to manually implement the binding before accessing that service.

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Point of Interest

A location (with a fixed position) where one can find a place, product or service, typically identified by name rather than by address and characterized by type, which may be used as a reference point or a target in a location based service request, e.g., as the destination of a route.

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Pixels (GIS)

[data structure] Pixels are the grid cells that make up raster images. Each cell is identical in size and records a brightness and color in an image.

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Projection

A mathematical model that transforms the locations of features on the Earth’s surface (sphere) to locations on a two-dimensional surface (flat map).

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Peer Review Forums

A facilitated event at which users of a particular regional solution are invited to share ideas on how to improve the solution, including but not limited to data content, access and custodial responsibilities. Through these events, MetroGIS identifies ways to ensure that solutions maintain their relevance with changing user needs, and leverage resources that were not available when the solution was implemented.

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Preamble

This listing of geospatial terms was developed at the direction of the MetroGIS Policy Board to help its members better understand recommendations they are asked to consider. This listing is intended to be a starting place. As the need is recognized, additions and modifications are to be incorporated. Users are encouraged to offer such modifications as they recognize the need. Proprietary Terms/Products are followed by “ ** “. It is understood that the listing of these terms is incomplete.

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Pan

To move the viewing window up, down, or sideways to display areas in a geographic data set which, at the current viewing scale, lie outside the viewing window.

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Plotter

A device for outputing hard-copy representations of data e.g maps

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Prototype

an approach to categorization that defines a category by identifying a particular object as the typical example. Other objects assigned to this category may not not share all characteristics with the prototype object. The degree of resemblance can be treated as a distance in a taxonomic space.

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Projection

coordinate transformation that converts latitude longitude measurements into planar coordinates. Projections can be based on a developable surface (such as a plane, cylinder, or cone) or on a mathematical function.

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Polygon overlay

a procedure that calculates the geometric relationships between two geographic representations (usually applied to vector models); used to merge attribute information .

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Point-in-polygon

procedure to determine which points fall into which polygons; can attach attributes to either the points or the polygons.