Book -1Std -10

1. Relative Location Location expressed using landmarks

▪ Behind Big Bazaar▪ Opposite Shiv Temple▪ Near Patel Pan

2. Absolute Location Location expressed using known

grid system▪ 19° N; 78° E

1. Latitudes and longitudes2. Eastings and Northings

Eastings Northings

Vertical Lines Horizontal Lines

North to South East to West

Numbered 00 to 99

Placed 2 cm (1 km) apart

Value increases towards east Value increases towards north

Eastings and Northings

Latitudes and Longitudes

Parallel and Equidistant

Longitudes not Parallel and equidistant

Distance between

successive eastings or

northings is 2 cm

Distance between two

degrees of latitude may be as large as

222 cm

Conclusion Both grid systems do not

overlap System of Eastings and

Northings is more accurate

System of Eastings and Northings is simpler

First two digits are eastings Next two digits are northings By convention, lesser value is always taken

• PAMERA

• MALGAON•1520

• GULABGANJ•1820 OR 1920

Eastings Northings

1 6 2 2

First two digits are eastings 3rd digit is the 10th division of eastings Next two digits are northings 6th digit is the 10th division of northings

Eastings 10th division

of eastings

Northings 10th division

of northings

1 6 5 2 2 7

EXPRESSING THE LOCATION AS A SIX FIGURE GRID REFERENCE

• 4 figure grid referenceis 2577

• Six figure grid reference of temple is

0 1 2 3 4 5 6 7 8 99876543210

25

77

78

26

2 5 7 73 1

4 figure grid reference 6 figure grid reference

EXPRESSING THE LOCATION AS A SIX FIGURE GRID REFERENCE

• 4 figure grid referenceis 2577

• Six figure grid reference

• A – 256778

• B – 258775

25

77

78

26

6 figure reference of G is

x = a / 2 y = b / 2 Truncate the decimals If a = 13 mm; b = 11 mm 6 figure grid reference is

256775

25

77

78

26

G

20 mm

a

b

2 5 x 7 7 y

Guided practice

Start working on the assignment sheet

End of Presenattion