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.
- Author: V.Olaya (c) 2004, O.Conrad (c) 2012
- Specification: grid
- Menu: Imagery|Tools
Parameters
| Name | Type | Identifier | Description | Constraints | |
|---|---|---|---|---|---|
| Input | Initial State | Grid list (input) | A | - | - |
| Final State | Grid list (input) | B | - | - | |
| Output | Distance | Grid (output) | DIST | - | - |
| Direction | Grid (output) | DIR | - | - | |
| Change Vector (*) | Grid list (optional output) | C | - | - | |
| Options | Angle Calculation | Boolean | ANGLE | angle calculation is only available when exact two features are compared | Default: 1 |
| Output of Change Vector | Boolean | C_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)