- 4.
Details across the border in Shenzhen are depicted in a generalised form in light brown colour.
The map series has been very popular among map users since its first publication and is very suitable for use as a wall map.
In line with the practice of most mapping agencies around the world, the SMO intends to produce all new mapping on the World Geodetic System (WGS 84) datum and use the WGS 84 Universal Transverse Mercator (UTM) Grid.
The WGS 84 datum used in this map series regards the earth as a spheroid with the centre of mass of the earth as the origin. This datum replaces the previous Local Geodetic Datum and gives slight differences of -5.5 seconds in latitude and +8.9 seconds in longitude in the geographical co-ordinates of Hong Kong.
This change of geographical co-ordinates, when projected onto the UTM Grid, results in a change of grid lines of about -170 metres in northing and +250 metres easting on ground. It does not mean that Hong Kong moves by that much but only the grid values change as the result of the use of WGS 84 datum.
The adoption of the new geodetic datum facilitates map users to identify their positions on the map by using Global Positioning System (GPS) equipment.
With the GPS equipment becoming more affordable, it has become more popular for use in navigation, surveying, engineering projects and general position fixing.
SMO also provides many other map products and publications, including digital maps and aerial photographs.
Detailed information is contained in the Hong Kong Map Catalogue, which is obtainable free of charge from Map Publication Centres of Hong Kong or Kowloon or at District Survey Offices in New Territories.
The revised maps are now on sale at the centres and offices at $40 per sheet.
End/Saturday, February 18, 1995
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