O-GIS Glossary,

Posted on Jul 2, 2007 By : Mizake Laziaf
This glossary is a sub-set of one developed by the Urban and Regional Information
Systems Association (URISA)


On-The-Fly
This term refers to temporary performance or activity when needed. It also refers to an instruction that is transparently invoked by the user according to conditions encountered during a transaction. Automatic Boolean operations that add, modify or skip certain processing steps under a particular set of conditions. For example, when adding a new spatial feature, the ID number of the previously encoded feature is defined along with the default rules for sequentially generating the "next" ID number to be used, modified or ignored.


Orthophoto
This term, refers to an aerial photograph that has had distortions due to elevation changes, variation in the distance from the camera to the ground at different locations, and aircraft movement removed. The process of distortion removal is referred to as image rectification. You can use rectified photographs, within the limits of their horizontal accuracy, be used to measure areas and distances. When first produced, orthophotos were delivered printed on paper or mylar. Today they are almost always delivered as digital files and therefore are more correctly referred to as orthoimages.

Out-Of-The-Box
Refers to a software or hardware system with a user interface so intuitive that it can be implemented without little or no training or reference to documentation.

Overlay
An overlay is something that is laid over or covers something else.
  1. In a manual graphic information system, a transparent sheet containing graphic information, such as labels, symbols or colored areas, defined in a manner to expedite being viewed and interpreted in conjunction with other data overlays with a common coordinate system.
  2. In an automated spatial information system, same as a manual system except that all overlays are in a digital format for viewing and interpretation on a CRT screen. Each overlay defines a specific aspect of the spatial database.
  3. Typical overlays could include land use, soils, watershed boundaries or drainage system overlays, each of which is a single or set of multiple layers within the spatial information system. 4) Also refers to the intersection of two polygon layers to make a third composite overlay (i.e. soils overlaid with land use to define runoff conditions). See Intersection.

Overshoot
Situation where a digital line extends past the intended boundary line. This extension past the intended juncture point is called a dangle


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