It is possible to hide different track lines in the application, which means that they are not displayed and cannot be selected. Because hidden lines cannot be selected, they also cannot be processed by the Subset Editor or the Line Editors (Navigation, Attitude, Swath, Side Scan, and Single Beam).
Hiding track lines is useful if you need to work with only some of the track lines in the project. For example, you may wish to edit only certain track lines in the Subset Editor, exclude track lines with poor navigation data, or check only the data from a single track line over an area of interest.
The fastest and easiest way to hide/display track lines is to create new track line layers based on their attributes. This can be done using either a user-defined attribute or the Line Class attribute.
If you want to hide/display track lines based on a user-defined attribute, first set the attribute up as described below:
1. (Optional) Open the HIPS file where you want to add the user-defined attribute and select one or more track lines.
This procedure has different results depending on whether any track lines are selected:
• If a track line is selected then the attribute will be added to the catalogue for its HIPS file. The attribute will therefore be available in that HIPS file, but not in any new files created in the future.
• If no track lines are selected (or if no HIPS file is open) then the attribute will be added to the default “HIPS and SIPS Features.catalogue” file. The attribute will be available in new HIPS files created in the future, but will not be available in any existing files.
2. In HIPS, select Tools > Editors > HIPS Catalogue to open the Catalogue Editor.
3. In the Object Browser pane, expand HIPS and SIPS Features, right-click on Attributes, and select Add.
4. Set the type to Enum and click OK.
5. Set up the new attribute with an Acronym, Name, and Expected Values.
To create a simple boolean attribute, give it two Expected Values, ‘true’ and ‘false’. It is also possible to create a more complex attribute with more than two Expected Values.
6. In the Object Browser window, expand HIPS and SIPS Features, expand its Objects folder, right-click on Line, and click Add.
7. Select the newly-created attribute and click OK.
8. Select File > Save to save the catalogue.
9. In the Object Browser pane, expand the HIPS and SIPS Features > Attributes folder, right-click on the newly-created attribute, and click Copy.
10. Select File > Open and open the HIPS file to which you want to add the attribute.
11. In the Object Browser window, expand the HIPS file, right-click on its Attributes, and select Paste.
12. In the Object Browser window, expand the HIPS file, expand its Objects folder, right-click on Line, and select Add.
13. Select the newly-create attribute and click OK.
14. Select File > Save to save the catalogue in the HIPS file.
15. Close Catalogue Editor.
16. If the HIPS file was open in HIPS, save, close, and reopen it.
To hide/display track lines based on their attributes (either Line Class or a user-defined attribute) do the following:
1. In the Layers window in HIPS, expand All Track Lines.
2. Right-click on the Track Lines layer named after the HIPS file and select Add Layer(s) > Classification.
3. Fill out these fields in the New Classification dialog and click OK:
• Set Name to a suitably descriptive name.
• Set Classification Type to Number of Values.
• Set Attribute to either Line Class or a user-defined attribute.
• Set Number of Values to 1.
4. In the Layers window:
• Un-check the box next to the Track Lines layer for the HIPS file.
• Check the box next to the group of Track Lines layers that was just created.
• Click on the group of Track Line layers that was just created so that it is highlighted.
5. Assign appropriate values to the desired attribute of the track lines:
• Select all of the track lines that you want to apply the same value to. This can be done in either the main display or the Active Track Lines window.
• In the Properties or Attributes windows, set the attribute (either Line Class or the user-defined attribute) to the desired value.
• Repeat the previous two steps for each type of track line that you want to classify.
For example, if you are classifying by Line Class, set the track lines used for patch testing to 1 (Patch Test), set the track lines with bad data to 5 (Data Quality Issue), set the finished track lines to 6 (Reviewed/Complete), and so on.
6. In the Layers window, un-check the boxes next to each of the values that you want to hide.
For example, if you classified the track lines by Line Class and only want to process the patch lines and finished lines, un-check all of the boxes except the ones for Patch Test and Reviewed/Complete.
7. Refresh the map view and confirm that only the desired track lines are displayed.
Now, the hidden track lines are not displayed and cannot be selected for processing in the Subset Editor or any of the Line Editors (Navigation, Attitude, Swath, Side Scan, and Single Beam). Instead, only the track lines that have their boxes checked in the Layers window are displayed and can be selected.
To change which track lines are displayed and hidden, simply check and un-check the boxes next to the line groups in the Layers window.
To change the classification of a particular line, simply select it in the main display or the Active Track Lines window, then go to the Properties or Attributes window and change the Line Class or user-defined attribute to the desired value. HIPS immediately moves the line to its newly-assigned line group.