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ENVI

Calculate the Extracted Feature Length

Calculate the Extracted Feature Length

You can calculate the length of extracted features and include the results as the attribute evf_length in the Layer Attributes table. The default units for the evf_length attribute are meters. You can set the parameters ENVI uses to calculate the length attribute.

  1. Select one of the following:
    • Right-click in the display group and select Calculate Length Attribute.
    • Right-click on the layer name in the Vector Parameters dialog and select Calculate Length Attribute.
    • Make the layer to calculate active, then from the Vector Parameters menu bar, select Options > Calculate Length Attribute.
  2. If the input band does not have map information, the Input Display Pixel dialog appears. Enter a pixel size and units, which ENVI uses to calculate the length.

    ENVI calculates the EVF length of the features, then displays the results in the evf_length field of the Layer Attributes table.



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