🌊 Hydrographic Survey

0/5 steps

STEP 1

Tide Gauge Setup

STEP 1 — SET UP TIDE GAUGE
Install and operate tide gauge.

Why we do this:
Water levels change constantly.
Soundings must be corrected to a
common datum (chart datum).

Setup:
• Install tide gauge at fixed location
• Record readings every hour
• Note time of each reading
• Mark gauge zero elevation

🔗Open METARDU Tool → Create Project

STEP 2

Positioning System

STEP 2 — SET UP POSITIONING
Configure GPS for boat positioning.

Options:
• RTK GPS on boat
• Total station shore setup
• Acoustic positioning

Requirements:
• Position accuracy < 1m
• Time sync with sounder
• Record fix numbers

🔗Open METARDU Tool → Create Project

STEP 3

Sounding Lines

STEP 3 — RUN SOUNDING LINES
Collect depth data along planned lines.

Planning:
• Parallel lines across survey area
• Line spacing based on requirements
• Run lines perpendicular to shore

For each fix:
• Record time
• Record position
• Record raw depth

🔗Open METARDU Tool → Create Project

STEP 4

Data Reduction

STEP 4 — REDUCE SOUNDINGS
Apply tidal corrections.

In METARDU Hydro Tools:
→ Enter tide gauge readings
→ Enter sounding data
→ Apply tidal correction

Formula:
Corrected Depth = Raw Depth - Tide Height

Chart Datum depth = Corrected Depth - Datum Offset

🔗Open METARDU Tool → Create Project

STEP 5

Generate Chart

STEP 5 — OUTPUT RESULTS
Create bathymetric chart.

In METARDU:
→ View cross sections
→ Generate contours
→ Export to CAD/DXF

Deliverables:
• Depth soundings table
• Bathymetric contours
• Survey report

🔗Open METARDU Tool → Create Project