GIS Dictionary

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degrees/minutes/seconds

The unit of measure for describing latitude and longitude. A degree is 1/360th of a circle. A degree is further […]

Delaunay triangles

[3D analysis] The components of Delaunay triangulation. Delaunay triangles cannot exist alone; they must exist as part of a set

Delaunay triangulation

[3D analysis] A technique for creating a mesh of contiguous, nonoverlapping triangles from a dataset of points. Each triangle’s circumscribing

deletes table

[database structures] The geodatabase system table, created when a feature class or table is registered as versioned, that maintains information

delimiter

[computing] A character, such as a space or comma, that separates words or values.

delta file

[data editing] A file that contains data edits that can be exchanged between geodatabases or between geodatabases and other data

delta table

[database structures] One of two geodatabase system tablesthe adds and deletes tablescreated for a feature class or table when it

DEM

[data models] Acronym for digital elevation model. The representation of continuous elevation values over a topographic surface by a regular

demographics

[geography] The statistical characteristics (such as age, birth rate, and income) of a human population.

demography

[geography] The statistical study of human populations, especially their locations, distribution, economic statistics, and vital statistics.

densify

[data editing] To add vertices to a line at specified distances without altering the line’s shape.

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