ES230 Exam 2 Raster Analysis

What is Map Algebra

Mathematical operations applied to raster data.

What are Local Operations

Cell-by-cell functions preformed on each individual cell

What are Global Operations

Applies bulk changes to all cells

What are Focal Operations

Calculates output based on neighboring cells / a window of cells.

What are Zonal Operations

Applies functions to specified groups of cells.

What are Relational Operations

Uses logical signs to test relationships. EX: <, >, =, != etc

What are Arithmetic Operations

Basic math functions like addition and subtraction.

What are Statistical Operations

Functions like min, max, average, and median.

What are Trig Operations

Functions like sine, cosine, and tangent.

What are some types of surface analysis?

Slope, Aspect, Hillshade, Contour lines

What is hillshade?

a shaded relief map of the terrain created by modeling the position of an illumination source

What is slope and aspect?

Slope is the slope... Aspect is the compus direction of the slope and its angles.

What are contour lines?

Imaginary lines on the ground connecting equal elevation, they represent high and low ground elevation.

What is Euclidean Distance

Output raster contains the measured distance from every cell to the nearest source (like buffer)

What is the reclassify tool?

Changes the classes that a raster has! EX: Euclidean distance gives distance from each cell, reclassify can make it so there can be a range of 1 - 10 m, 11 - 20m etc.