GIS Dictionary

[coordinate systems] In a coordinate system, any line of longitude designated as 0 degrees east and west, to which all

In astronomy and geodesy, the vertical circle that passes through an observer’s zenith and through the east and west points

[ESRI software] An ArcIMS virtual server that offers functionality not directly accessible when creating a Web site. The functionality associated

Usually a text file named prj.adf that is associated with a coverage, GRID, or TIN. The PRJ file contains the

[GPS] Acronym for pseudo-random noise code. A repeating radio signal broadcast by each GPS satellite and generated by each GPS

[statistics] A measure of the likelihood that a particular outcome, such as a spatial pattern or event, will occur given

[statistics] A surface that gives the probability that the variable of interest is above or below a specified threshold value.

[programming] In software, a block of code that performs some task. Procedures are commonly used to organize code into reusable

1 [modeling] In geoprocessing in ArcGIS, a tool and its parameter values. One process, or multiple processes connected together, creates

[ESRI software] In ArcGIS Image Server, a list of raster processes that are performed on the fly by the server

[cartography] A graph of the elevation of a surface along a specified line.