4.2.5. 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 MC ID C ID in Algorithm. Overlapping signatures sharing the same ID are not highlighted.

4.2.5.1. LC Signature threshold

• 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;

• : show the ROI spectral signature in the Spectral Signature Plot; spectral signature is calculated from the Band set;

4.2.5.2. 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 : set the threshold based on the minimum and maximum of each band;

• σ * : 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 : set the threshold using the temporary ROI pixel values, according to the following checkboxes:

  • +: if checked, signature threshold is extended to include pixel signature;

  • –: if checked, signature threshold is reduced to exclude pixel signature;

• From pixel : set the threshold by clicking on a pixel, according to the following checkboxes:

  • +: if checked, signature threshold is extended to include pixel signature;

  • –: if checked, signature threshold is reduced to exclude pixel signature;