Book -1 Std -10

Relative Location Absolute Location Location expressed using landmarks Behind Big Bazaar Opposite Shiv Temple Near Patel Pan Absolute Location Location expressed using known grid system 19° N; 78° E

Latitudes and longitudes Eastings and Northings

Value increases towards east Value increases towards north 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

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 7

EXPRESSING THE LOCATION AS A SIX FIGURE GRID REFERENCE 25 26 4 figure grid reference is 2577 Six figure grid reference of temple is 1 2 3 4 5 6 7 8 9 78 2 5 7 3 1 77

4 figure grid reference 6 figure grid reference

EXPRESSING THE LOCATION AS A SIX FIGURE GRID REFERENCE 25 77 78 26 4 figure grid reference is 2577 Six figure grid reference A – 256778 B – 258775

x y 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 2 5 x 7 y 20 mm G a b

Start working on the assignment sheet Guided practice Start working on the assignment sheet

End of Presenattion