GIS Dictionary

[surveying] A unit of length equal to 66 feet, used especially in U.S. public land surveys. Ten square chains equal 1 acre.

[data capture] A method of drawing a polygon as a series of straight line segments defined as a set of directional codes, with each code following the last like links … Read more

[remote sensing] A process that measures how the attributes of a particular area have changed between two or more time periods. Change detection often involves comparing aerial photographs or satellite … Read more

[computing] A letter, digit, or special graphic symbol treated as a single unit of data and usually stored as one byte.

1 [cartography] A map used to plot a course for air or water navigation. 2 [mathematics] A graphic representation of tabular data; a diagram showing the relationship between two or … Read more

[ESRI software] In disconnected editing, the procedure that transfers a copy of data into a master geodatabase, overwriting the original copy of that data and reenabling it so it can … Read more

[ESRI software] A procedure in disconnected editing that records the duplication of data from one geodatabase to another and disables the original data so that both versions cannot be accessed … Read more

[ESRI software] In ArcGIS versions 8.39.1, a personal or ArcSDE geodatabase that contains data checked out from a master geodatabase during disconnected editing.

[ESRI software] The data version created in a checkout geodatabase when data is checked out to that database during disconnected editing. The checkout version is created as a copy of … Read more

[ESRI software] A type of geodatabase replication that involves copying data to a destination geodatabase, editing that data in the destination, and then merging the changes with the source geodatabase. … Read more

[statistics] A statistic used to assess how well a model fits the data. It compares categorized data with a multinomial model that predicts the relative frequency of outcomes in each … Read more

[ESRI software] In geodatabase editing, data that has been copied to a destination geodatabase during the replication process.

A straight line that joins two points on a curve.

[cartography] A thematic map in which areas are distinctly colored or shaded to represent classed values of a particular phenomenon.

The saturation, purity, or intensity of a color.

[navigation] Acronym for Chart Updating Manual. A document containing updates to aeronautical information, used by the U.S. military to update their current published products with the latest information.