CARIS HPD Source Editor CARIS HPD Source Editor
Menu | Tools > Limits and Boundaries > Wagon Wheel Filter |
Tool |
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This command is only available if the Limits and Boundaries module is enabled. See Modules for further information |
The wagon wheel filter is run on an existing coastline or low water line. It locates the contributing points of a limit and creates a line joining these points. This line can be used as a baseline in other maritime limits and boundaries tools.
The filter simulates running a wagon wheel over the coastline or low water line. The radius of the wheel equals the value of the limit line. Points that are touched by the wheel are called contributing points because they contribute to the limit line. A large wheel touches fewer points than a small wheel, therefore baselines created using large radiuses will be smoother than those using smaller radiuses.
Similar to the Interactive Baseline command but automatic.
Related commands:
• • • • | • • • • |
Interface
Group | Option | Description |
|---|---|---|
General | Name | The name of the layer that will contain the new line. Select from the list. This can be the same as the source layer. |
Input | Source | The input line or lines. The most recently used source will be selected by default. Select from the list: • [blank line]: This will clear the text box. • Superselection: The superselected line, if any. This is not available if no features are selected. • Selection: All selected lines, if any. This is not available if no features are selected. • [list of layers]: All available layers. All lines in the layer are used as source lines. It is recommended that you select a layer only if it contains suitable source lines and no other lines, such as a filtered layer that contains only coastlines. |
Output | Lines | The feature acronym and attributes of the output line. By default, the most recently used acronym, if any, will be selected. Type an acronym or select from the list: • [blank line]: This will clear the text box. • [recent objects]: A list of any recently used objects. • Templates: Displays the Select Template dialog box. See Use Limits and Boundaries Templates for details. • Objects: Displays the Select Object dialog box. Select an acronym from the list of Feature Acronyms then define the attributes. |
Report | Create Report | Output points to a text file: • False: No report file will be created. • True: Contributing points will be saved to a text file. The Location and Name properties become active. |
Location | Accept the default or click browse (...) to select a location for the report. | |
Name | Type a name for the report. | |
Advanced Options | Contributing Points | Create symbols marking the contributing points. Select the feature acronym and set the attributes of the contributing points. By default, the most recently used acronym, if any, will be selected. Type an acronym or select from the list: • [blank line]: This will clear the text box. • [recent objects]: A list of any recently used objects. • Templates: Displays the Select Template dialog box. See Use Limits and Boundaries Templates for details. • Objects: Displays the Select Object dialog box. Select an acronym from the list of Feature Acronyms then define the attributes. |
Radius | The geodetic radius of the wagon wheel. This is usually equivalent to the limit for which you are determining the contributing points. For example, if the baseline will be used to define a 12 nautical mile limit, more points will be required than if it will be used to define a 200 nautical mile limit Setting the radius to the same value as the limit will ensure the correct number of corresponding points are created. | |
Reverse Direction | The limit is generated on the right side of the source line, based on the starting point and the direction in which the line was digitized. If the resulting line is to landward, undo the command and try again with this option changed. • False: The starting point of the line is not changed. • True: The starting point of the line is changed and the direction reversed. |
Toolbar:
Icon | Description |
|---|---|
| Categorized. Display the properties in their categories. |
| Alphabetical. Display the properties in alphabetical order. |
| Quick print. Prints the current settings of the dialog box. Displays a Print dialog box. |
| Print Preview. Displays the current settings of the dialog box. |
Procedure
1. Select a coastline, low water line or baseline.
2. Select the Wagon Wheel Filter command.
The Wagon Wheel Filter dialog box is displayed.
3. Select an output layer (Name).
4. Select an input feature or layer (Source).
5. Select the acronym and attributes for the output line (Lines).
6. Enter a radius.
7. Set any other necessary options.
8. Click OK.
A line is generated to seaward of the input line.
If a filter is applied to the inside of an arc with a radius so large that it filters out all points, a message is displayed. Run the process again with a smaller radius or using the Reverse Direction property. |
