GEOCODER

Developed by Dr. Luciano Fonseca, formerly of UNH-CCOM Licensed as a standard feature in HYPACK ® (HYPACK MAX, OFFICE, ACOUSTIC and HYSWEEP licenses) In HYPACK, it can run in 32-bit and 64-bit Operating Systems Creates mosaics from: – Side Scan – Multibeam Average Backscatter – Multibeam SnippetsGEOCODER 2 Advanced Backscatter Correction Algorithms Bottom Classification using Angular Response Analysis

81X/7K/R2S GEOCODER Data Flow SIDE SCAN SURVEY HYSWEEP SURVEY HSX GEOCODER SIDE SCAN MOSAIC HS2 MTX or XYZ Side Scan Data Multibeam Average Backscatter & Snippet Data Bathymetric Model (optional) TIF Adjust Bottom Detection, if needed MBMAX HS2 GSF 81X/7K/R2S

4 Input Data Files Select one of the 4 files types to be used Average Backscatter (intensity data stored in RMB record) (HS2/GSF)Average Backscatter (intensity data stored in RMB record) (HS2/GSF) Snippets (HS2/GSF)Snippets (HS2/GSF) Side Scan (HSX/HS2)Side Scan (HSX/HS2) Side Scan and DTMSide Scan and DTM Side Scan: (HSX/HS2) )DTM (XYZ-Gridded, MTX ) If a file is selected with the wrong file type, Geocoder will give this message Bringing in a DTM with your sidescan data allows you to enhance your mosaic with angle varied gain algorithms.

GEOCODER will attempt to generate a mosaic over the entire extents of your data. Depending on the size of your area, you may have to limit the Pixel Size (green box). You can ‘Lock’ your mosaic to a user-defined area in the Mosaic Options window (red box). Setting the area and size of your Mosaic Mosaic Options

Loading your Data Files First, select the type of data. Second, check the Calibration Parameters Third, enter your data files.

Making the Mosaic Make your mosaic Check your mosaic options

Histogram Manipulation d. Once your mosaic is made, you can make instant changes using the Histogram.

Mosaic Palettes Once your mosaic is complete, you can instantly change the color scheme of the mosaic by selecting a new palette. Mosaic shown in different color palettes

Overlays A few displays: backscatter, backscatter and bathymetry, ARA Overlay your imagery, bathy, ARA, and statistics to better visualize your data. Save the view to GeoTIFF files

Users can remosaic entire lines or sections of lines. Normally used to change the overlap option.Remosaicing

Bathymetric Corrections Load a bathymetric model from MTX or XYZ to apply: correction for actual angle of incidence for all data types.correction for actual angle of incidence for all data types. improved area correctionimproved area correction improved slant-range correction for side scan data.improved slant-range correction for side scan data. DTM must be a gridded XYZ or a MTX file.DTM must be a gridded XYZ or a MTX file.

Statistics Calculate and display over twenty statistical metrics of your backscatter at a user-defined grid spacingCalculate and display over twenty statistical metrics of your backscatter at a user-defined grid spacing Overlay statistical map on mosaic or bathyOverlay statistical map on mosaic or bathy A listing of all statistics that can be viewed on the data

Each sonar can have its own particular faults that influence the acoustic beam pattern. Each sonar can have its own particular faults that influence the acoustic beam pattern. In GEOCODER, users can make adjustments based on the sonar’s beam pattern. In GEOCODER, users can make adjustments based on the sonar’s beam pattern. This process needs to be done only once, and the beam pattern file can be used on future mosaic ( think of this as a calibration file) This process needs to be done only once, and the beam pattern file can be used on future mosaic ( think of this as a calibration file) 1.Isolate a short swath over a flat, boring bottom. It can be just a few hundred pings. 2.Use the ‘Extract Beam Pattern’ menu item to determine the adjustment for the sonar. 3.Save the resulting beam pattern adjustment to a file. 4.After extracting the beam pattern, or reading a previously extracted beam pattern file, your data will be automatically adjusted. Bottom Classification: Extracting the Beam Pattern

Used to determine bottom classification across a swath. Matches acoustic response to known bottom types. 1.Create the mosaic. 2.Calculate the ARA for the mosaic. 3.Select a single swath from the mosaic screen. 4.Run the ARA – Patch ARA routine. Bottom Classification: Angular Response Analysis AVI 1 Color-coded ARA Selecting a swath for ARA Analysis Patch ARA Analysis Window AVI 2

Output ARA results to DXF Export ARA results to a DXF contour map The entire mosaic can be used for bottom classification. You must enable the ‘Formal Inversion. When completed, click the Save DXF menu item at the bottom. This process can take a while to compute the file