Geodetic Survey Information Main Page

The Geodetic Survey Section is mainly responsible for maintaining and densifying a network of accurate survey control points that covers the whole territory of the Hong Kong SAR. This network provides the fundamental horizontal and vertical position reference for many vital activities, such as mapping, land boundary survey, land administration, building, infrastructure project, railway development, town planning, new town development, environmental protection, safety management of navigations in the air and the sea, and etc. Moreover, the Geodetic Survey Section is also responsible to maintain baselines for EDM calibration and steel band standardization.

Geodetic Survey Stations

Horizontal Control Network

Triangulation stations first appeared on the map of Hong Kong in 1845. As at January 2007, there were about 230 Trigonometrical Stations and 3,520 Traverse Stations totally established in Hong Kong.

With GPS technology, the Geodetic Survey Section has established the Hong Kong 2000 GPS Control Network with 46 control stations, and a further 12 Continuous Operating Reference Stations (CORS) in the Satellite Positioning Reference Station Network (SatRef).

Vertical Control Network

There were about 1,590 benchmarks as at January 2007 that formed the primary levelling network in Hong Kong. The height values of the benchmarks over the Hong Kong Principal Datum (HKPD) were precisely surveyed. They are used as the reference for determining heights for construction activities in Hong Kong.

Geodetic Survey Specifications

Accuracy Standards of Control Survey - Version 1.0 (PDF)
Specifications of Survey Monuments for Horizontal Controls (1.1MB, PDF)
Specifications of Survey Monuments for Vertical Controls (PDF)

Download Geodetic Survey Information

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Geodetic Survey Station Key Maps

Click the links below for the corresponding Key Map:

Report on Missing / Disturbance of Geodetic Survey Stations

To report missing or disturbance of Survey Stations:

For SMO Users: please use Standard Form SMF-0153(pdf) and follow the procedures of SMWI-TEC-0077(pdf) to report to Geodetic Survey Section.

For Non-SMO Users: Please send e-mail to geodetic@landsd.gov.hk.

 

Download Station Summary

You can get the Station Summary directly using "Enter Station Number :" box and click "Search" button.

Enter Station Number :
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Calibration Baselines and GPS Calibration Networks

The Geodetic Survey Section has established Calibration Baselines and a GPS Calibration Network for Calibration of Survey Equipments such as EDM, GPS and Steel Bands.

To download the baseline summary, calibration network summary or booking form, please click the corresponding links below:

Baseline / Network / Booking Form Date Size

Booking of the Plover Cove EDM Calibration Baseline

You can view the current EDM Calibration Baseline Booking Status here. Please contact Senior Survey Officer/Geodetic Information at 2231-3497 for booking.