GIS Dictionary

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transformation

[data conversion] The process of converting the coordinates of a map or an image from one system to another, typically […]

transit rule

1 A rule for adjusting the closure error in a traverse. The transit rule distributes the closure error by changing

translation

1 [data editing] Adding a constant value to a coordinate. 2 [data conversion] Converting data from one format to another,

transverse aspect

[map projections] A map projection whose line of tangency is oriented along a meridian rather than along the equator.

traverse

1 [surveying] A predefined path or route across or over a set of geometric coordinates. 2 [surveying] A method of

traverse course

[ESRI software] In ArcMap and Survey Analyst for field measurements, a group of observed values that define a new coordinate.

tree data structure

A common data structure consisting of a set of nodesbasic units of datalinked hierarchically. Each node can contain one or

trend

[spatial statistics use for geostatistics] In a spatial model, nonrandom variation in the value of a variable that can be

trend surface analysis

A surface interpolation method that fits a polynomial surface by least-squares regression through the sample data points. This method results

triangle

1 [Euclidean geometry] Any closed, three-sided, two-dimensional polygon. 2 [Euclidean geometry] A face on a TIN surface. Each triangle on

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