What is Total Propagated Uncertainty (TPU) in hydrographic surveying?

Total Propagated Uncertainty (TPU) is the combined effect of all error sources – including GNSS positioning, tide measurements, and sensor offsets – on the final depth measurement. TPU analysis is essential for IHO S‑44 Special Order and Order 1a compliance, ensuring that survey data meets international standards for nautical charting and dredging projects.

How do I use the ERH TPU Calculator?

Simply enter your GNSS horizontal and vertical RMS, tide uncertainty, and sensor offset values. You can also upload a CSV file containing Easting, Northing, and Tide data to auto‑populate the inputs. The calculator then computes the Total Propagated Uncertainty and classifies your survey according to IHO S‑44 standards (Special Order, Order 1a, or Order 1b).

What are the IHO S-44 uncertainty standards for hydrographic surveys?

IHO S‑44 defines three main uncertainty standards: Special Order (≤0.15 m) for the highest precision surveys such as port and harbor engineering; Order 1a (≤0.5 m) for standard hydrographic surveys; and Order 1b (≤1.0 m) for surveys in less critical areas. The ERH TPU Calculator automatically classifies your survey based on the computed uncertainty.

Can I generate a PDF report from the TPU calculation?

Yes. After computing your TPU, click the 'PDF Report' button to download a professionally formatted report containing your uncertainty values, IHO classification, and input parameters. This report is ideal for project documentation, client presentations, and quality assurance records.

ROKIB HYDRO-TECH | Hydrographic Survey, Dredging & Marine Engineering

TPU Calculator (IHO S-44) – Total Propagated Uncertainty with PDF Report & CSV Upload

ERH TPU Calculator – IHO S-44 Total Propagated Uncertainty for Hydrographic Survey

📂 Drag & drop CSV file (Easting, Northing, Tide) or click to upload

📋 IHO Order Preset

📡 Horizontal RMS (m) – GNSS

📏 Vertical RMS (m) – GNSS

🌊 Tide Uncertainty (m)

⚙️ Sensor Offset Uncertainty (m)

0.000 m

TPU Calculator (IHO S-44) – Total Propagated Uncertainty with PDF Report & CSV Upload

ERH TPU CALCULATOR (FINAL)

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