Hk Ce Map Reading

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Basic Reference Basic Reference Certificate Geography Certificate Geography Revision Exercises – Revision Exercises – Issues & Map-Reading P.49- Issues & Map-Reading P.49- 76 76 HKCEE HKCEE MAP READING MAP READING SKILLS SKILLS : :

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Transcript of Hk Ce Map Reading

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Basic ReferenceBasic ReferenceCertificate Geography Revision Certificate Geography Revision Exercises –Exercises –Issues & Map-Reading P.49-76Issues & Map-Reading P.49-76

HKCEEHKCEEMAP READINGMAP READINGSKILLSSKILLS::

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Basic Map Reading Skills:Check List Conventional Signs Grid References Scales Direction Gradient Cross-section & Relief Features

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Conventional Signs Reference - WB:49

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Conventional Signs Reference - WB:49

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Conventional Signs Reference - WB:49

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Conventional Signs Reference - WB:49

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Conventional Signs Reference - WB:49

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Conventional Signs Reference - WB:49

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Grid References (WB:51-52) to tell locations on a map two sets of lines

vertical – eastings (number values increase eastwards)

horizontal – northings (number values increase northwards)

grid square 4-figure location 6-figure

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Grid References

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Grid References(WB:53)

1132

147343

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Scale (WB:54-55) to show the number of times that

the actual size of the ground has been reduced

helps us find out real distance / area from the map

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Scale Statement Scale

describes the scale in words e.g. 1 cm to 200m

Representative Fraction (R.F.) shows scale in the form of a fraction / ratio e.g. 1:20000

Linear Scale uses a line to show the scale e.g.

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Direction Reference – WB:59

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Direction Reference – WB:59

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Direction Reference – WB:60

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Cross Section

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Cross Section

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Cross Section

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Cross Section

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Cross Section

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Vertical Exaggeration Reference – WB:72

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Vertical Exaggeration

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Vertical Exaggeration

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Relief Features Reference – WB:65-68

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Relief Features

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Relief Features

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Relief Features

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Relief Features

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Relief Features

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• gentle slope• steep slope• concave slope• convex slope• stepped slope• spur• valley• hill• ridge• saddle

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Gradient

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Gradient

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Gradient

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Gradient

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Calculate the Average Gradient of the Stream from A (source) to B (bridge)

A

B

A: 340m

B: 80m

Gradient: 1 in HD/VDHD: measured actual length of the red line is 7.5cmMap Scale is 1 : 20000Actual Distance:(7.5 X 200)m = 1500mVD: 340m – 80m =260m Gradient: 1 in 1500m/260m= 1 in 5.8