Locating Places on Maps --

Grid Reference (格網座標 )

Look at the relief map of H.K.Look at the relief map of H.K.Can you tell the location of Tai Mo ShanCan you tell the location of Tai Mo ShanLook at the relief map of H.K.Look at the relief map of H.K.Can you tell the location of Tai Mo ShanCan you tell the location of Tai Mo Shan

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Look at the seating plan of your classroomLook at the seating plan of your classroomCan you tell the location of Carol’s seat in the classroom?Can you tell the location of Carol’s seat in the classroom?Look at the seating plan of your classroomLook at the seating plan of your classroomCan you tell the location of Carol’s seat in the classroom?Can you tell the location of Carol’s seat in the classroom?

What is grid reference?What is grid reference?What is grid reference?What is grid reference?

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•A grid is a set of numbered vertical and horizontal lines which cross each other.

•Grid reference is a number which represents the location of a place on a grid.

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Naming grid lines on mapsNaming grid lines on mapsNaming grid lines on mapsNaming grid lines on maps

Map 110

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•The vertical lines are numbered from west to

east. The vertical lines are called eastings eastings ((東行線東行線 )).

•The horizontal lines are numbered from south to north. The horizontal lines are called

northingsnorthings ((北行線北行線 )).

Map 110

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•Grid reference is formed by the intersection of an easting and a northing.

•To tell the position of a place, we put the easting first and then northing.

How to read a grid reference?How to read a grid reference?How to read a grid reference?How to read a grid reference?

Map 110

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Example:The 4 - figure grid reference (grid square) of pig farm 3 is 1324

Exercise 1: Complete the table.

Location Easting Northing Gridreference(4-figure)

12 24

14 25

FactoryA

FactoryB

Pig Farm 1 and 2

1224

Ah jing’shome

1425

12 23 1223

15 23 1523

Map 110

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Example:The 4 - figure grid reference (grid square) of pig farm 3 is 1324

Exercise 2: Draw the following things on the map 1

Map 1

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Sometimes, a 4 - figure grid reference does not give the exact location of a place.

For example, on Map 1, both pig farm 1 and 2 are on the grid square 1224. It does not tell us the exact location of the pig farm 1and 2. To be more exact, we use a 6 - grid reference.

To do this, we divide each grid square into ten smaller squares numbered from 1 to 9.

Example:The 6 - figure grid reference of pig farm 1 is pig farm 2 is

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125245129244

Give a 6 - figure grid reference for each of these on Map 2.

Railway station _______________

fire station ___________

hospital _____________

police station_____________

church ________________

cultivated land __________

Exercise 3:Exercise 3:Exercise 3:Exercise 3:

129240

131243

137241

127245

127237

131219

Why do we use grid references?Why do we use grid references?Why do we use grid references?Why do we use grid references?

•Grid reference make it quick and easy to locate places on maps.

•They also make it easier to tell someone else where something is.

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