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.
- 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.
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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.