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Book -1 Std -10. Relative 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. Conclusion - PowerPoint PPT Presentation
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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