Monday, December 13, 2010

Global Mapper's Add/Update Measurement attributes to line/polygon features

Calculating the linear or polygon geometry's measurement attributes such as length, perimeter or area can be done easily Global Mapper's Add/Update the Measure Attributes of Selected Features command. If the feature does not have the measurement attribute fields - Length, Perimeter or Enclosed Area, then the command will append them to the feature. Otherwise, the command will update the fields with the recalculated measurement values.
  1. Start up Global Mapper and open up a vector linear or polygon feature file.

  2. Click the Digitizer Tool .

    The cursor changes to a cross-hair with the Edit label.
  3. Using the mouse, click and drag to select one or more features.

    The features are selected.

  4. Press the mouse right button anywhere in the map display.

    A pop up menu appears.
  5. Choose Add/Update the Measure Attributes of Selected Feature(s).

    The selected features are updated and a message appears.
  6. Click OK.
To review the measure attributes of a feature, press ALT+P and click on any feature. This will bring up a Feature Information dialog box as shown below. Note the measure attribute fields Length.

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