Tool Confusion Matrix (Two Grids)
The tool allows one to compare two classified grids. It creates a confusion matrix and derived coefficients as well as the combinations of both classifications as new grid. The values of both grids must match each other in order to do the comparison.
The tool provides three options to define the grid classes:
- by providing a look-up table for each grid
- by coloring each grid with a look-up table (colors type = classified) beforehand (only available in the GUI)
- by preparing the grid values appropriately; i.e., if no look-up table is provided, the tool simply extracts the classes from the grid values found in each grid
A typical application is a change detection analysis based on land cover classification of satellite imagery.
- Author: O.Conrad (c) 2010
- Menu: Imagery|Classification
Parameters
| Name | Type | Identifier | Description | Constraints |
Input | Classification 1 | Grid, input | ONE | - | - |
Look-up Table (*) | Table, input, optional | ONE_LUT | - | - |
Classification 2 | Grid, input | TWO | - | - |
Look-up Table (*) | Table, input, optional | TWO_LUT | - | - |
Output | Combined Classes | Grid, output | COMBINED | - | - |
Confusion Matrix | Table, output | CONFUSION | - | - |
Class Values | Table, output | CLASSES | - | - |
Summary | Table, output | SUMMARY | - | - |
Options | Grid System | Grid system | PARAMETERS_GRID_SYSTEM | - | - |
Value | Table field | ONE_LUT_MIN | - | - |
Value (Maximum) (*) | Table field | ONE_LUT_MAX | - | - |
Name (*) | Table field | ONE_LUT_NAM | - | - |
Value | Table field | TWO_LUT_MIN | - | - |
Value (Maximum) (*) | Table field | TWO_LUT_MAX | - | - |
Name (*) | Table field | TWO_LUT_NAM | - | - |
Report Unchanged Classes | Boolean | NOCHANGE | - | Default: 1 |
Include Unclassified Cells | Boolean | NODATA | - | Default: 1 |
Output as... | Choice | OUTPUT | - | Available Choices: [0] cells [1] percent [2] area Default: 0 |
(*) optional |
Command-line
Usage: saga_cmd imagery_classification 2 [-ONE <str>] [-ONE_LUT <str>] [-ONE_LUT_MIN <str>] [-ONE_LUT_MAX <str>] [-ONE_LUT_NAM <str>] [-TWO <str>] [-TWO_LUT <str>] [-TWO_LUT_MIN <str>] [-TWO_LUT_MAX <str>] [-TWO_LUT_NAM <str>] [-COMBINED <str>] [-NOCHANGE <str>] [-NODATA <str>] [-CONFUSION <str>] [-OUTPUT <str>] [-CLASSES <str>] [-SUMMARY <str>]
-ONE:<str> Classification 1
Grid, input
-ONE_LUT:<str> Look-up Table
Table, input, optional
-ONE_LUT_MIN:<str> Value
Table field
-ONE_LUT_MAX:<str> Value (Maximum)
Table field
-ONE_LUT_NAM:<str> Name
Table field
-TWO:<str> Classification 2
Grid, input
-TWO_LUT:<str> Look-up Table
Table, input, optional
-TWO_LUT_MIN:<str> Value
Table field
-TWO_LUT_MAX:<str> Value (Maximum)
Table field
-TWO_LUT_NAM:<str> Name
Table field
-COMBINED:<str> Combined Classes
Grid, output
-NOCHANGE:<str> Report Unchanged Classes
Boolean
Default: 1
-NODATA:<str> Include Unclassified Cells
Boolean
Default: 1
-CONFUSION:<str> Confusion Matrix
Table, output
-OUTPUT:<str> Output as...
Choice
Available Choices:
[0] cells
[1] percent
[2] area
Default: 0
-CLASSES:<str> Class Values
Table, output
-SUMMARY:<str> Summary
Table, output