Triton Bathymetry Manual de usuario

Perspective-MB -- Bathymetry Processing Guide -- Software Version 7.6 By: Tony M. Ramirez November, 2013

Page 6 information extracted. Even though Temperature and other values may be present in the data file we can ignore them and only define the v

Page 7 will have a .svp_xml extension and will be used in the BathyOne processing wizard to correct the data for changes in sound velocity throu

Page 8 To parse the data select any line in the top window, then set the delimiter to Comma. Set the Attribute type to Data, select the value o

Page 9 Review the range of values and axis labels and compare them with expected results before clicking Save As to create a .tide_xml file. 3.2

Page 10 set to Data, choose the correct Field and Format for each Parsed Field, and when finished review the Decoded Data Elements to verify the

Page 11 4.0 Import 4.1 File Import To get started, the raw XTF bathymetry data files need to be imported into Perspective using the Raw Data Fil

Page 12 4.3 Navigation There are two important things that happen as the raw data is imported into Perspective. The first is the creation of ca

Page 13 5.0 Process 5.1 BathyOne Wizard The easiest method for launching the bathymetry processing wizard is by selecting the toolbar button sho

Page 14 A few things to note:  Gridding Methods: There are two different gridding methods available, our standard DTM gridding algorithm and

Page 15 5.1.3 Gridding of Soundings Sets the grid resolution, encoding method, and fill and smooth filters. A checkbox exists to Constrain to m

Page ii © 2013 TRITON This user guide is provided as a means to become familiar with TRITON’s software through an explanation

Page 16 5.1.4 Geometry Settings There are two options here for vessel offsets: either pole/hull mounted; or towed configurations.  Vessel Mo

Page 17 5.1.5 Raw Processing Several options are available on this page as shown in the example right and described below:  Navigation Process

Page 18  TPE Settings: The Total Propagated Error (TPE) for each sounding is written into the Generic Sensor Format (GSF) file when it is cre

Page 19  UTC Timing Delay: If there is a known clock timing delay in the acquisition system it can be entered here.  Attitude Correction

Page 20 The example on the previous page indicates all beam flagged as “Bad” will be ignored, the outside angle will be limited to 70 degrees fo

Page 21 5.1.8 Tide/Squat Processing The XML files created earlier for tides and squat can be applied at this stage of the processing wizard. Th

Page 22 5.1.9 Processing Results A few things will happen during processing of the multibeam data. 1. GSF files: As mentioned in the “Note”

Page 23 5.2 Other Processing Options Presented here are a few optional processing tools: 5.2.1 Navigation and Attitude Processing The BathyOne p

Page 24 6.0 Enhance There are three primary options for enhancing the appearance of the bathymetry grids in Perspective. These are adjustments

Page 25 For adjusting the color of an individual grid layer, right click on the layer name in the file tree. The example shown right is for op

Page iii Table of Contents 1.0 Introduction ... 1 2.0 Setting

Page 26 What causes this affect is a combination of the relatively flat seafloor with some low frequency noise that stretches the data range. A

Page 27 7.1 Swath Editor The Swath Editor in Perspective allows the user to edit the beam flags in the GSF file associated with the selected nav

Page 28 and cleaning an entire data file from start to finish, it helps to start with a large Sweep Length (50 to 100) to cover as much area as

Page 29 An example of the Area Editor is shown below: The most commonly used toolbar buttons are described below. Allows the user to change h

Page 30 Used for removing soundings within a defined polygon area Will show soundings marked as “bad” by beam suppression filters during gridd

Page 31 7.3 Apply Edits to Grid In order to update the grid file with the revised beam flags, there are two options available by right-clicking

Page 32 8.0 Interpret To assist with interpretation of the bathymetry data Perspective has many added features and toolsets. This section brief

Page 33 A few things to note:  The bathy profile tool works for any grid layer including the QC layers generated during gridding (density, sta

Page 34 8.3.2 DTM – Standard Deviation Layer This layer gives the standard deviation of the sounding values within each grid cell. Note that wh

Page 35 8.3.3 DTM – IHO Compliance There are 5 options presented in the IHO layer selection as shown to the right. The user can request the res

Page iv 5.2.6 Re-build Using ...

Page 36 This equation and the values for ‘a’ and ‘b’ come from IHO Standards for Hydrographic Surveys, Special Publication No. 44. 8.3.4 CUBE Un

Page 37 except in the center where the wreck is located. It is important that the user examines the places where multiple hypotheses were ident

Page 38 4. Processing QC Tool: To gain a better confidence in the results from data processing it can be useful to grid the same dataset twice

Page 39 8.5 Backscatter and Snippet Processing (Geocoder) For backscatter and snippet processing we utilize Geocoder written by Dr. Luciano Fons

Page 40 4. The last step is to select the “Assemble” option at the bottom of the Mosaic Menu.  This will start the processing of the ins

Page 41 8.6 SeaClass Backscatter and snippet results can be classified using Perspective’s SeaClass module. Note that having bottom samples or

Page 42 HTF files are created in the same folder as the GSF files, in a subdirectory where the grid file was written to, with the name of the su

Page 43 The BAG (Bathymetry Attributed Grid) file is a non-proprietary format for storing and exchanging bathymetric data and was developed by t

Page 44 9.7 Printing It is possible to print what is shown in the map view to a paper printer. When selected, everything shown in the map view

Page 45 10.0 Workflow Step 1 - Launch Perspective: Start application and open project or start new project. Step 2 - Check Settings: Verify max

Page 1 1.0 Introduction This document presents a sample workflow for processing bathymetry data using Triton’s Perspective software. Also cover

Page 2 NUMBER OF CORES: Below the file paths is a section titled Number of Cores for setting the number of computer processing cores (or thread

Page 3 Select the preferred BAG file version (or leave default selection) and set the file path to the correct location as shown here: C:\BAG_S

Page 4 This will open a file browser to locate the raw SVP file. Once the file is selected, the Sound Velocity Format Parsing dialog will launc

Page 5 the settings. The Decoded Header Element section in the bottom right corner of the dialog shows the information extracted from the heade