Option | Description |
Options available for all mosaic engines | |
Blending | The method used to blend pixels together. The default value is Weighted Average. (Does not apply to Geocoder mosaic.) Select from: • Weighted Average: Blend overlapping pixels based on a weighted average value • Highest weighted: Use only the highest-weighted pixel in the output, no blending • Overwrite: Use the last input pixel value in the output, no blending |
Weighting | The method used to weight pixels across a single ping. The default value is SWATH. (Does not apply to Geocoder mosaic.) Select from: • Swath: Weighting is based on sonar geometry where Nadir has a low weight, off-nadir has the highest weight, and a decay function is used to decrease weighting out to the swath edge • Fixed: All values are weighted equally across the ping (primarily for SAS imagery). |
Enable Mosaic Editing | Select the check box to enable editing of the mosaic after creation. |
Extent | Displays the ground coordinates of the current view of data in the Display window. These are displayed as Lower Left and Upper Right X and Y values. This is the default setting. To change the area of the mosaic: 1. Click the Pick from screen button. 2. Use the cursor to drag a box around an area to mosaic. Coordinates for the area will update as you draw, resize or move the box. The mosaic created will be within the extents of the box. To restore the default stetting, click the Use screen extents button. |
Options for SIPS Backscatter engine | |
Use compensated data | Teledyne RESON s7k format can store Beam Average and Time Series data in raw and compensated intensity datagrams. • If option is enabled the mosaic will use compensated data from any line containing it. • If compensated data is not found the line will not be used in the mosaic. |
Imagery Type | The type of imagery to be processed. 1. Select either Beam Average or Time Series. The default value is Beam Average. |
Local Absorption | Correction for transmission loss using temperature and salinity values. • Set temperature value in degrees. Default value is 8.00. • Set salinity value as parts per thousand. Default value is 35 parts per thousand. |
Surface | The path to the surface used to compute the local bottom slope used in the calculations of real incidence angle and ensonified area. The default elevation band will be used. 1. Click Browse and locate surface to be used. If a surface is not set, the default value is to use the processed bathymetry. |
Beam Pattern File | 1. Select the check box to enable the Browse button. Browse to locate the beam pattern file to be applied. When a file is set here, the options to update or overwrite can be activated in Beam Pattern File Operation field |
Beam Pattern File Operation | If the beam pattern file selected in the field above already exists, you can set the fate of the existing file. • Update: Updates the file with the new line information. This option can accumulate many lines over many surveys. • Overwrite: Overwrites the existing file with a new beam pattern file from the current lines. • Use Existing: Uses the existing file and does not update it. The default value is UPDATE. |
Angle-Varying Gain | Use a moving average filter to remove the angular response of sediment from the imagery. 1. Enable the check box and then select the type of filter from the list. |
Sound Velocity | Enter a numeric value for the sound velocity in distance per second. The default value is in metres/second. |
Filter Data | Enable the check box to filter the final compensated intensities of the mosaic using range values. • Set Minimum value for the range (default value is -100dB) • Set Maximum value for the range (default value is 0dB. |
Transducer 1 Angle filter | Filter data from transducer 1 to a minimum/maximum value. 1. Enter a value in degrees or radians (degrees are the default units). |
Transducer2 Angle Filter | Filter data from transducer 2 to a minimum/maximum value. 1. Enter a value in degrees or radians (degrees are the default units). |
Options for SIPS Side Scan | |
Channel | 1. Select the Port, Starboard or Both channels to be read to mosaic. Deafault value is Both. |
Beam Pattern | Set which channel will have beam pattern applied to it. 1. Select Port, Starboard or Both. (Default is None.) |
Beam Pattern File | 1. Select the check box to enable the Browse button. Browse to locate the beam pattern file to be applied. When a file is set here, the options to update or overwrite can be activated in Beam Pattern File Operation field |
Gain Normalization | |
Despeckle | Smooths imagery by removing “noise”. Pixels are removed If they have an intensity level outside a specified strength compared to their neighbouring intensity levels. 1. Enter a numeric value specifying the strength of the despeckle filter as a percentage for despeckling the output mosaic pixels. |
Time-Varying Gain | Gain varied by time values is applied so that inner-most samples have the least gain and the outer-most samples have the highest gain correction. 1. Enable the check box to apply TVG. 2. Select to apply to Port, Starboard or Both. |
Gain | Apply a uniform gain correction without applying the any time-dependent gains by using only the Gain controls. 1. Enable the check box to apply Gain. 2. Select to apply to Port, Starboard or Both, in side scan. |
Use Bathymetry to Register Imagery | If imagery is acquired at the same time as bathymetry, the bathymetry can be used to register the imagery. 1. Enable the check box to register the imagery using co-acquired bathymetry. This is only applicable if the lines contain processed bathymetry. |
Gyro Source | Set the heading source to be used for processing a side scan mosaic. Default setting is Automatic, which will apply Towfish gyro first, then Ship gyro, then Course Made Good. Any of these options can be applied instead: • CMG: Course made good, calculated from position • SHIP: Ship gyro sensor • FISH: Towfish gyro sensor |
Smooth Gyro | Enable check box to apply smoothing coefficients for gyro data. |
Sound Velocity | Enter a numeric value for the sound velocity in distance per second. The default value is in metres/second. |
Extrapolate Time | Enable the check box to extrapolate heading and navigation data at the beginning and end of lines. Set a value for the time. |
Filter Data | Enable the check box to filter the final compensated intensities of the mosaic using range values. • Set Minimum value for the range (default value is -100dB) • Set Maximum value for the range (default value is 0dB. |
Across- track / Altitude Ratio | Enable the check box and enter the values for the ratio of across-track distance to altitude (minimum/maximum) for which imagery is clipped (i.e., nadir and swath edge filter, respectively). 1. Set the minimum across-track distance to altitude ratio to filter by. 2. Set the maximum across-track distance to altitude ratio to filter by. If not set, no clipping is applied. |
Across- track / Altitude limit | Only active if Across- track / Altitude Ratio is enabled. Enable the check box and enter values to limit the across- track / altitude ratio to a minimum/maximum range. |
Across-track distance limit | Filter to exclude a fixed distance across-track from nadir, regardless of altitude. Enable the check box and set the • Minimum values below this distance from nadir will be filtered. • Maximum- values greater than this distance from nadir will be filtered |
Altitude Offset | Enable the check box to enter offset values for the altitude data in time and height. Default units are in seconds and metres. |
Options for Geocoder engine | |
Auto Resolution | If selected, a resolution will be set based on density of data. |
Channel | 1. Select Port channel, Starboard or Both to be read to mosaic. (Does not apply to Backscatter mosaic) |
Imagery Type | The type of imagery to be processed. 1. Select either Time Series, Beam Average or Side Scan. The default value is Time Series. |
Beam Pattern | Set which channel will have beam pattern applied to it. 1. Select Port, Starboard or Both. (Default is None.) |
Beam Pattern File | 1. Select the check box to enable the Browse button. Browse to locate the beam pattern file to be applied. When a file is set here, the options to update or overwrite can be activated in Beam Pattern File Operation field |
Anti-Aliasing | Anti-aliasing can minimize distortion artifacts when representing the high resolution imagery at a lower resolution. 1. Enable the check box to smooth mosaic using anti-aliasing. |
Gain | Apply a uniform gain correction without applying the any time-dependent gains by using only the Gain controls. 1. Enable the check box to apply Gain. 2. Select to apply to Port, Starboard or Both, in side scan. (Does not apply to Backscatter mosaic) |
Time-varying Gain | Gain varied by time values is applied so that inner-most samples have the least gain and the outer-most samples have the highest gain correction. 1. Enable the check box to apply TVG.. |
Angle-varying Gain | Use a moving average filter to remove the angular response of sediment from the imagery. 1. Enable the check box and then select the type of filter from the list. |
Window Size | This option is activated if Angle-Varying Gain check box is selected. 1. Set the number of across track samples to include in the moving average filter. (Applies to GeoCoder mosaic only.) |
Despeckle | Smooths imagery by removing “noise”. Pixels are removed If they have an intensity level outside a specified strength compared to their neighbouring intensity levels. 1. Select Weak, Strong, Moderately Strong or Very Strong from the list. Default is None. |
Smooth Gyro | Select the check box to apply smoothing to the gyro data. |
Surface | The path to the surface used to compute the local bottom slope used in the calculations of real incidence angle and ensonified area. The default elevation band will be used. 1. Click Browse and locate surface to be used. If a surface is not set, the default value is to use the processed bathymetry. |
Filter Data | Enable the check box to filter the final compensated intensities of the mosaic using range values. • Set Minimum value for the range (default value is -100dB) • Set Maximum value for the range (default value is 0dB. |
Filter Angle from Nadir | Enable the check box to use an angle across-track from directly below the ship (0 degrees) to set how much data is included in the beam pattern file. Value applies to both port and starboard angles. Set minimum value in degrees of the angle from nadir. Default is 0 degrees. Set maximum value in degrees of the angle from nadir. (Applies to GeoCoder mosaic only.) |
