Calibration tools enable you to resolve navigation latency and transducer mounting offsets and update the HVF.
Most errors are detected by examining along-track patterns. An exception is roll errors for which across-track patterns are compared
An additional comparison can be done by creating a surface from the un-calibrated data, calibrating the data, and then creating a new surface to see and compare the effect of the calibration values.
A full calibration workflow consists of these processes:
1. Processing the raw data
• select surveyed test lines to use as calibration lines.
• select or create e a HIPS Vessel file for this calibration line data. (See Create a New HVF.)
• create a project for the calibration data. (See New Project.)
• convert the raw calibration data to HIPS format. (See Conversion Wizard.)
• apply sound velocity correction to the calibration data (if this data was recorded for the calibration data.) (See Sound Velocity Correction.)
• load tide. (See Import Auxiliary Data -Tide.)
2. Apply Merge to the calibration data lines to produce geo-referenced processed depths (See Merge)
3. [Optional] Create a gridded surface from the data before calibration values are applied to the data. (See New Surface (Regular Gridded))
4. [Optional] Add an RMS layer to the gridded surface. (See Compute Root Mean Square Error.)
5. Edit and/or filter edit and /or filter the lines in Swath Editor to remove large spikes and noisy data.
6. Use the calibration tools to determine navigation latency (manual process only) and transducer mounting angles, and to update the HVF.
• Automatic Boresight Calibration
• Calibration Tools in Subset Editor (manual calibration method)
7. Apply Sound Velocity Correction and Merge again to apply calibrated values to data.
8. [Optional] Create a new gridded surface and RMS layer to view the improvements to data after calibration values are applied.