GIS Dictionary

[spatial analysis] A drawing technique for hiding part of one layer using another set of features. Variable depth masking allows […]

[statistics] A numeric description of how values in a distribution vary or deviate from the mean. The larger the variance,

[surveying] In surveying, the symmetric 3×3 matrix that mathematically expresses the correlation between errors in coordinates x, y, and z.

[data structures] A data type that can contain any kind of data.

[spatial statistics use for geostatistics] A function of the distance and direction separating two locations that is used to quantify

[spatial statistics use for geostatistics] The process of examining spatial dependence using a variogram; a set of procedures (as much

[ESRI software] Acronym for value attribute table. A table containing attributes for a grid, including user-defined attributes, the values assigned

[non-ESRI software] Acronym for Visual Basic Virtual Machine. The runtime environment used by Visual Basic code when it runs.

[data models] A coordinate-based data model that represents geographic features as points, lines, and polygons. Each point feature is represented

[data models] A representation of the world using points, lines, and polygons. Vector models are useful for storing data that

[data conversion] The conversion of raster data (an array of cell values) to vector data (a series of points, lines,