TRITON HISTORICAL TARGET PROCESSING
- USER GUIDE -
1.0 OVERVIEW
The Triton Historical Target Processing software provides
two capabilities. The first is the
display of historical targets in the
The second capability of the Historical Targeting software is the ability for historical targets to be imported into Triton Map. Imported historical target icons are shown at their correct geo-location in the Triton Map display.
The combined ability to view historical targets in the waterfall display of newly collected data and in the overview map display of Triton Map provides an effective change-detection system that will aid operators in the identification of new objects when resurveying known areas.
The individual programs that are involved in the operation of the Triton Historical Target processing software are: the HTI Extractor, Isis, and Triton Map. The operation of each of these programs is described below.
2.0 HTI EXTRACTOR
Running the HIT Extractor program is required as a
preprocessor to enable
2.1 Program Operation
The program is started by selecting the “Triton HTIExtractor” from the Triton Imaging program group. The user interface shown below is displayed:
1. Use the two buttons to select the directory containing the Historical Target CON files and/or GeoTIF files and the folder containing the XTF files to be processed.
2. Specify if the program is to process only CON files in the selected
directory, only GeoTIFs, or both.
3. Select a heading determination method that the HTI algorithm will use in its
conversion from the geo-coordinates of the targets to ping-coordinates in the
XTFs:
- CMG is to be used if the navigation updates in the CON files and/or in the XTF files are of low frequency. This mode uses the position information in the ping data and interpolates between the navigation updates to derive the heading of individual pings. CMG should not be used if the navigation updates are of high frequency as in AUV data that has undergone accurate navigation processing.
- Sensor is to be used if the heading values in the XTF and the CON files are of high accuracy such as with AUV data.
- Ship will use the ship gyro to determine the heading
4. Select Contact Hot Spot type. This determines what icons will be drawn in the waterfall for the historical targets:
- Two Corners will result in a box defined by the location and size of the contact
- Center will result in one point at the center of the Historical Target location.
5. Press the Create CCD file
button.
6. The position of
each contact is searched for in each XTF file.
If the contact is found to lie within the coverage of an XTF file, a
record is written to the CCD file for that XTF file and an associated entry is
added to the list on the left at the bottom of the HTI Extractor display. A CCD file is a text file with the same path
and name of the XTF file it pertains to but with the extension changed to .CCD. The format of the .CCD file is detailed in Appendix
A of this document.
7. If a contact’s position cannot be
identified to lie within an XTF file, the list on the right side of the display
reports this. One reason a contact may
not be found in an XTF file is a units mismatch. Both the contact and the XTF file being
searched must store positions in the same units, meters or degrees.
8. To be accurately processed, a CON contact
must have a sufficient number of pings with unique and valid navigation. If this is not the case, the positioning of
the associated icon in the
3.0
DISPLAYING HISTORICAL TARGETS IN
After the HTI Extractor program has been run, and the CCD
files containing the required information have been created,
Operation is as follows:
1. Select the Configure / Cue Boxes menu selection. Check the “Show Cue boxes around contacts” box.
2. Use the Browse button to point to the directory containing the XTF files to be played back and their associated CCD files.
3. Use the slider to select the
confidence threshold of the targets to be displayed. The confidence level comes from the target CON
file and is transferred to the .CCD file.
GeoTIF targets are always given a confidence level of 100%. Contacts that were generated before the
implementation of confidence levels will always have a confidence level of
0. For these to be displayed, “Display
special zero-level confidence” must be checked.
4. Close the Cue Boxes dialog with the
OK button.
5. Playback an XTF file in the directory
selected in the Cue Boxes dialog. The
waterfall display will show the Historical Targets icons at their correct
location. An example is shown below.
In this example, the four corners representation was selected in the HTI
Extractor resulting in the square boxes being drawn indicating the position and
size of the original contact. If the “Center” option had been selected, a point
would be drawn at the center location of each target. Below each box will be one or two lines of
text. One line will show the target number if the target was from a CON file
target, and an incremental number starting at one for GeoTIF targets, followed
by the target confidence. The second line will display the annotation for the
target from the CON file.
Control over whether or not the icons and/or text are
displayed is provided by the View/Overlay
menu option in
Another important feature of the HTI Extractor is that if
one clicks on an entry in the list on the left at the
bottom of the HTI Extractor display, a section of the XTF file that contains
the Historical Target represented by the list item will be displayed in the
4.0 IMPORTING HISTORICAL TARGETS INTO TRITON MAP
Historical target CON files and GeoTIF files may be imported into Triton Map using the Import menu as shown below:
Import Historical Contact(s) provides a way to classify and separate historical contacts from other contacts imported into Triton Map. These contacts are treated almost the same as normal contacts but are allocated to a different vector layer to allow independent control over their display in Triton Map.
Import Contact GeoTIF(s) allows the import of GeoTIF contacts. GeoTIF contacts imported into Triton Map do not display an image. They display a symbol and text at the correct geo-location in the Triton Map display.
The following image shows one of each kind of contact in the Triton Map display, normal contacts, historical contacts, and GeoTIF contacts. Note that each contact belongs to a different vector layer. The vector layer controls the symbols and text for all the contacts associated with it.
The symbol and text color for each vector layer may be changed independently by right clicking on the layer node in the tree view, selecting Properties from the displayed menu, and selecting the Settings tab. The symbol is the selected Point Symbol and the text color is the Label Color.
As with normal targets, a right click on the icon in the display for a historical or GeoTIF target will invoke the Target Info or Target GeoTIF Info Viewer. The Load Target button will invoke TargetPro and the image of the selected target will be displayed.
Appendix A: CCD FILE FORMAT
The .CCD file created for each XTF file is an ASCII text file in which each line has information for each historical CON file or GeoTIF contact that was found in the XTF file.
The space separated fields are as follows:
HtiID: This is the
number that appears in the
Channel: P for Port, S for Starboard
Navigation: C for
sufficient navigation in the contact file, B for insufficient. If the navigation is insufficient, the cue
box will be blue instead of red in the
First corner ping number
First corner Date and time: year.month.day.hour.minute.second.centiseconds
First corner sample number
First corner longitude or easting
First corner latitude or northing
Second corner ping number
Second corner Date and time: year.month.day.hour.minute.second.centiseconds
Second corner sample number
Second corner longitude or easting
Second corner latitude or northing
Annotate= : after the equal (=) sign will be the annotation from the CON file. Blank for GeoTIF contacts.
The following is an example of a CCD file record.
9999 P C 1037 2009.4.23.7.54.9.40 1503 10.46589992 59.45420475 1305 2009.4.23.7.54.14.78 1771 10.46580581 59.45408784 100 Annotate=