Lectur2

Question 1

PRE-SURVEY

Answer 1

Specifications/requirements
Survey planning
Equipment calibration
Mobilization and Logistics

Question 2

What the pitch test

Answer 2

1. Roll – Side-to-side tilt of the vessel.
2. Pitch – Forward and backward tilt of the vessel.
3. Yaw – Rotation of the vessel around its vertical axis.
4. Latency – Delay in sensor data processing, causing positional errors.

Question 3

What the DATA
ACQUISITION

Answer 3

Shoreline Data
Navigation and Attitude
Data
Tide gauge data
Bathymetric Data
Other Hydrographic Data
Marine Geoscience Data
Oceanographic Data

Question 4

HYDROGRAPHIC TASKS

Answer 4

1.PRE-SURVEY
2.DATA ACQUISITION
3.DATA PROCESSING
4. DATA ANALYSIS
5. DATA PRODUCTION

Question 5

What the DATA ANALYSIS ?

Answer 5

Surface representation,
DTM generation,
manipulation,
interpretation,
applications, and
visualization

Question 6

What the DATA PRODUCTION?

Answer 6

Bathymetric, contour
and sounding maps

Question 7

What the SHORELINE DELINEATION?

Answer 7

1. Air photography
2. Ortho-imagery
3. Satellite images
4. Topographic Lidar
5. GNSS

Question 8

What the الأجهزة حقت NAVIGATION AND ATTITUDE

Answer 8

1.GNSS Reference Station
2. GNSS Rover
3. IMU
4. GNSS works in RTK-
GNSS mode or CDGPS
Mode

Question 9

What the TIDE GAUGE
RECORDS

Answer 9

Three tide correction cases:
Single tide station observations
Multiple tide stations observations
RTK-GNSS-Tide

Question 10

ALH LIDAR systems use:

Answer 10

1.Red wavelength (Infrared, vertical beam)
2. Blue – Green wavelength (scanning beam)

Question 11

What the OTHER HYDROGRAPHIC DATA

Answer 11

1. Hazards to navigation – wrecks, rocks, reefs
2. Elevations, Clearances
3. Sailing Directions, pictures

Question 12

What the MARINE GEOSCIENCE
DATA (1)

Answer 12

Bottom type: grabs, cores, side-scan sonar
interpretation, etc.
• Seismic (2-D, 3-D), sub-bottom profiling, boomers,
sparkers, etc.
• Magnetometer, gravimeter

Question 13

اذكر 2 من

The sonar receives High and Low Intensity Returns.

Answer 13

Hard Seabed (i.e. rock).

Surfaces with a lot of variation (i.e. gravel).

Question 14

اذكر اثنين من

Low Intensity Returns will be received from:

Answer 14

● Soft seabed (i.e. silt).
● Flat surfaces (no features to scatter the signal).

Question 15

OCEANOGRAPHIC DATA (1)

Answer 15

CTD and/or sound speed profiles (moving or stopped?)
• Current measurements, water samples, pressure gauge
data, etc.
• Deployment and recovery of bottom mounted gear

Question 16

What the SOUND VELOCITY PROFILE (SVP) and رسمة

Answer 16

Measures speed of sound over precisely known distance

Question 17

DATA ACQUISITION SOFTWARE

Answer 17

Hypack
Qinsy
SIS
PDS2000