Locating Places on Maps -- Grid Reference ( 格網座標 )

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Presentation transcript:

Locating Places on Maps -- Grid Reference ( 格網座標 )

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

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

What is grid reference?

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.

Naming grid lines on maps

Map

The vertical lines are numbered from west to eastings east. The vertical lines are called eastings ( 東行線 ) ( 東行線 ). The horizontal lines are numbered from south to north. The horizontal lines are called northings ( 北行線 ) northings ( 北行線 ).

Map

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?

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

Exercise 1: Complete the table. Pig Farm 1 and Ah jing’s home

Map 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

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 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

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:

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.

The End