Source diagrams are used to show the reliability of the surveys over the area of the chart. The Generate Source Diagram tool helps automate the creation of source diagrams or Zone of Confidence (ZOC) diagrams. It does this by inserting a new data frame and by creating a new layer from the LNDARE features and by displaying the Zone of Confidence features from MetadataA in another layer. The source diagram data frame is one-tenth the scale of the active data frame and inherits the projection of the active data frame. The NaturalFeaturesA feature class contains the LNDARE object, which is used to generate one of the reference layers in the source diagram, so this layer must be present in the active data frame.
- Start ArcMap.
- Add the NaturalFeaturesA feature class to the active data frame if it is not already included.
- On the main menu, click Customize > Toolbars > Nautical Cartography.
- Click the Generate Source Diagram button on the Nautical Cartography toolbar.
The Generate Source Diagram dialog box appears with the progress. When the process completes, a new data frame with two layers, one that represents a merge of all LNDARE features and one that represents the Zone of Confidence areas, is inserted into the map document.
You can now generalize the features, add the grid and source survey information layer, and if necessary, modify the surround element to meet your specific requirements.