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ENVI

Review Detections

Review Detections

Use the Review Detections panel to review and flag target detections resulting from the Anomaly Methods panel. The Review Detections panel provides a simple and quick way to review each detection by allowing you to plot its mean spectrum and attempting to identify it using the Material Identification tool. You can export targets of interest using the Export Targets panel. The following steps describe how to use the Review Detections panel.

  1. To skip reviewing detections, click the Do not review detections option in the Review Detections panel. THOR will export all detected targets to a single class in the Export Targets panel. Otherwise, leave this option unchecked.
  2. The THOR Viewer is displayed with the detections overlaid. The THOR Viewer target list will have four layers loaded: Pending, Good, Bad, and the input detection layer (Anomalies in the example below). The input detection layer is initially hidden. By default, all detections are placed in the Pending layer. You can adjust the properties of these layers by clicking the layer name.
  3. You can change the reference image in the THOR Viewer using the Reference Image drop-down list. Depending on the input image bands available, several different color composites will be available in addition to rule images used to create the detection overlay.
  4. The detection list shows all of the detections (clusters of pixels) in the detection overlay along with several properties. Detection list fields include ID (numeric identifier for detections), Pixels (the number of pixels in the detection), Strength (the mean value of the rule image used to generate the detection), and State (Pending, Good, or Bad). Clicking on a row header will select the detection and center the THOR Viewer on that detection. Clicking on a column header will sort the table by that column. You can sort the table by selecting the desired field from the Sort by drop-down list. Use the List Detections drop-down list to view all or only certain types of flagged detections.
  5. For each detection, determine whether it is Good (of interest) or Bad (not of interest). You may examine the detections visually, use Plot Spectrum to view the mean spectrum for the detection, or Identify Material to use the Material Identification panel to attempt to identify the detection. Data must be in units of reflectance to properly use the Material Identification panel. When you have determined whether the detection is of interest or not, click on the appropriately colored flag to mark it. The detection will change color both in the THOR Viewer and in the table. The next detection will then automatically be selected and the THOR Viewer will center over it, so you can review it. You may also use the Next and Prev buttons to manually navigate through the detection table.



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