5. LCS threshold

_images/LCS_threshold.jpg

LCS_threshold LCS threshold

This tab allows for setting the signature thresholds used by Land Cover Signature Classification. All the signatures contained in the Training input are listed; also, signature thresholds are saved in the Training input.

Overlapping signatures (belonging to different classes or macroclasses) are highlighted in orange in the table LC Signature threshold; the overlapping check is performed considering MC ID or C ID according to the setting Use checkbox MC ID checkbox C ID in Algorithm. Overlapping signatures sharing the same ID are not highlighted.

5.1. LC Signature threshold

  • input_table LC Signature threshold: table containing the following fields;
    • MC ID: signature Macroclass ID;
    • MC Name: signature Macroclass Name;
    • C ID: signature Class ID;
    • C Name: signature Class Name;
    • Color [overlap MC_ID-C_ID]: signature color; also, the combination MC ID-C ID is displayed in case of overlap with other signatures (see Land Cover Signature Classification);
    • Min B X: minimum value of band X; this value can be edited;
    • Max B X: maximum value of band X; this value can be edited;
  • sign_plot: show the ROI spectral signature in the Spectral Signature Plot; spectral signature is calculated from the Band set;

5.2. Automatic thresholds

Set thresholds automatically for highlighted signatures in the table LC Signature threshold; if no signature is highlighted, then the threshold is applied to all the signatures.

  • Min Max enter: set the threshold based on the minimum and maximum of each band;
  • σ * input_number enter: set an automatic threshold calculated as (band value + (σ * v)), where σ is the standard deviation of each band and v is the defined value;
  • From ROI LCS_threshold_ROI_tool: set the threshold using the temporary ROI pixel values, according to the following checkboxes:
    • checkbox +: if checked, signature threshold is extended to include pixel signature;
    • checkbox : if checked, signature threshold is reduced to exclude pixel signature;
  • From pixel LCS_threshold_set_tool: set the threshold by clicking on a pixel, according to the following checkboxes:
    • checkbox +: if checked, signature threshold is extended to include pixel signature;
    • checkbox : if checked, signature threshold is reduced to exclude pixel signature;