SAGA-GIS Module Library Documentation (v2.1.4)

Module Change Vector Analysis

This module performs a change vector analysis (CVA) for the given input features. Input features are supplied as grid lists for initial and final state. In both lists features have to be given in the same order. Distance is measured as Euclidean distance in features space. When analyzing two features direction is calculated as angle (radians) by default. Otherwise direction is coded as the quadrant it points to in terms of feature space.

Parameters

 NameTypeIdentifierDescriptionConstraints
InputInitial StateGrid list (input)A--
Final StateGrid list (input)B--
OutputDistanceGrid (output)DIST--
DirectionGrid (output)DIR--
Change Vector (*)Grid list (optional output)C--
OptionsAngle CalculationBooleanANGLEangle calculation is only available when exact two features are comparedDefault: 1
Output of Change VectorBooleanC_OUT-Default: 0
(*) optional

Command-line

Usage: saga_cmd grid_analysis 6 -A <str> -B <str> [-DIST <str>] [-DIR <str>] [-ANGLE <str>] [-C_OUT <str>] [-C <str>]
  -A:<str>    	Initial State
	Grid list (input)
  -B:<str>    	Final State
	Grid list (input)
  -DIST:<str> 	Distance
	Grid (output)
  -DIR:<str>  	Direction
	Grid (output)
  -ANGLE:<str>	Angle Calculation
	Boolean
	Default: 1
  -C_OUT:<str>	Output of Change Vector
	Boolean
	Default: 0
  -C:<str>    	Change Vector
	Grid list (optional output)