📝 Day 25: Module 3 Mastery Quiz – Data Acquisition
📝 DAY 25: MODULE 3 QUIZ
Masterpiece Edition – Assess Your Knowledge on Data Acquisition, Software, QC & Troubleshooting
Instructor: Engr. Rokib Hossain | River Warrior Academy
📖 Table of Contents
1. Module 3 Quiz – Data Acquisition, Software, QC & Troubleshooting
Test your understanding of Days 16‑24. Answer each question before revealing the answer.
🔹 1. Which of the following is NOT a function of hydrographic acquisition software?
- A) Real‑time tide correction
- B) Sonar beamforming and ray‑bending
- C) Creating final nautical charts (georeferenced)
- D) Logging raw sensor data
🔹 2. What is the recommended maximum file size for raw MBES data to avoid corruption?
- A) 500 MB
- B) 1 GB
- C) 2 GB
- D) 10 GB
🔹 3. You are surveying and the RTK fix drops to “FLOAT”. What should you do?
- A) Continue logging, fix later in post‑processing
- B) Stop logging, wait for fix to return, then re‑run the line
- C) Increase vessel speed
- D) Switch to single‑beam mode
🔹 4. Which side scan file format is considered the industry standard for exchange?
- A) .sss
- B) .xtf
- C) .s7k
- D) .all
🔹 5. What is the purpose of real‑time coverage display in MBES acquisition?
- A) To visualise water column fish
- B) To ensure 100% bottom overlap and detect gaps
- C) To adjust SVP
- D) To calibrate IMU
🔹 6. The lever arm is defined as:
- A) Angular offset between IMU and vessel
- B) Linear offset (X,Y,Z) between sensors (GNSS, IMU, transducer)
- C) Time delay between ping and GNSS timestamp
- D) Distance from vessel to shore
🔹 7. Which of the following software is primarily used for post‑processing bathymetric data to produce IHO‑compliant charts?
- A) Hypack
- B) Teledyne PDS
- C) CARIS HIPS/SIPS
- D) QINSy
🔹 8. What is the typical cause of “smile” or “frown” artifacts in MBES outer beams?
- A) Incorrect lever arm
- B) Outdated or incorrect SVP
- C) Motion sensor misalignment
- D) GNSS latency
🔹 9. When using a towfish for side scan, what is the recommended layback calculation?
- A) Layback = cable length
- B) Layback = cable length × sin(depression angle)
- C) Layback = water depth
- D) Layback = vessel speed × 2
🔹 10. Which COM port setting is most common for NMEA 0183 GNSS receivers?
- A) 4800 baud, 8 data bits, no parity, 1 stop bit
- B) 9600 baud, 8 data bits, even parity, 2 stop bits
- C) 115200 baud, 7 data bits, no parity, 1 stop bit
- D) 19200 baud, 8 data bits, no parity, 1 stop bit
🔹 11. What is the purpose of a patch test?
- A) To measure lever arm offsets
- B) To determine residual roll, pitch, yaw, and latency errors
- C) To calibrate the sound velocity probe
- D) To test vessel speed
🔹 12. Which backup strategy is recommended for hydrographic raw data?
- A) One copy on acquisition computer
- B) Two copies: one on external drive, one on cloud
- C) Three copies: two different media, one off‑site (3‑2‑1 rule)
- D) No backup – raw data is not needed after processing
🔹 13. You see excessive noise on your MBES water column display only when the engine is running. Most likely cause:
- A) Bad SVP
- B) Electrical interference from alternator or propeller cavitation
- C) Wrong tide datum
- D) GNSS multipath
🔹 14. In QINSy, what is the advantage of using a SQLite database for logging?
- A) Smaller file size
- B) All data (position, motion, sonar) stored in a single robust file
- C) Faster real‑time display
- D) Automatic cloud backup
🔹 15. What is the maximum acceptable PDOP for IHO Order 1a surveys?
- A) 1.0
- B) 2.5
- C) 4.0
- D) 6.0
2. Answer Key Summary
| Question | Correct Answer |
|---|---|
| 1 | C |
| 2 | C |
| 3 | B |
| 4 | B |
| 5 | B |
| 6 | B |
| 7 | C |
| 8 | B |
| 9 | B |
| 10 | A |
| 11 | B |
| 12 | C |
| 13 | B |
| 14 | B |
| 15 | B |
3. Recommended Resources for Further Review
4. Action Items & Next Steps
- 📌 Review any questions you missed by revisiting the corresponding day.
- 📌 Share your score in the comments (optional) – challenge your peers.
- 📌 Proceed to Day 26: Processing Introduction.
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