Chapter 4: Characterizing the Functional Operations

These flashcards cover key definitions and concepts related to functional operations in GIS as discussed in Chapter 4.

Local Functions

Functions that operate at a very local level on individual grid cells in a raster GIS.

Focal Functions

Functions that evaluate the grid cell values in a raster map by examining the target cell and its neighbors.

Zonal Functions

Functions that analyze a defined zone (or region) of grid cells sharing the same values.

Block Functions

Modified versions of focal functions that use a moving window to evaluate a block at a time.

Global Functions

Functions that operate on the entire grid at once, allowing for complex evaluations and analysis.

Map Algebra

A set of algebraic rules used to manipulate raster data in a GIS.

Reclassification

The process of changing the values assigned to grid cells based on certain criteria.

Euclidean Distance

A measure of straight-line distance from one cell to another in a grid.

Weighted Distance Functions

Functions that calculate distance considering the varying costs associated with moving through different areas.

Hydrological Functions

Specialized functions designed to model the movement and flow of water across topographic surfaces.

Trigonometric Functions

Local functions that perform trigonometric calculations (e.g., sin, cos) on raster grid cells.

Statistical Functions

Functions that evaluate statistical measures (e.g., min, max, mean) for input grids.

Fragmented Zones

Zonal regions in a GIS that are not connected but share the same value.

Neighborhood Functions

Functions that apply to a selected area around each grid cell in raster analysis.

Surface Global Functions

Functions that characterize and analyze the physical surface of the Earth in raster GIS.

Model Verification

The process of ensuring that the GIS model's results are accurate and reliable.