GRID REFERENCE : GRID REFERENCE
WAYS OF EXPRESSING LOCATION : WAYS OF EXPRESSING LOCATION 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
GRID SYSTEMS USED IN TOPOGRAPHICAL MAPS : GRID SYSTEMS USED IN TOPOGRAPHICAL MAPS Latitudes and longitudes
Eastings and Northings
Slide 4 :
Eastings and Northings : Eastings and Northings
Comparison between two grid systems : Comparison between two grid systems Conclusion
Both grid systems do not overlap
System of Eastings and Northings is more accurate
System of Eastings and Northings is simpler
Slide 7 :
Using Northings & Eastings to express location : Using Northings & Eastings to express location 4 figure grid reference
6 figure grid reference
4 figure grid reference : 4 figure grid reference First two digits are eastings
Next two digits are northings
By convention, lesser value is always taken
EXPRESSING THE LOCATON AS A FOUR FIGURE GRID REFERENCE : EXPRESSING THE LOCATON AS A FOUR FIGURE GRID REFERENCE PAMERA
MALGAON
1520
GULABGANJ
1820 OR 1920
6 Figure Grid Reference : 6 Figure Grid Reference 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
EXPRESSING THE LOCATION AS A SIX FIGURE GRID REFERENCE : EXPRESSING THE LOCATION AS A SIX FIGURE GRID REFERENCE 4 figure grid reference
is 2577
Six figure grid reference of red square is 25 77 78 26
EXPRESSING THE LOCATION AS A SIX FIGURE GRID REFERENCE : EXPRESSING THE LOCATION AS A SIX FIGURE GRID REFERENCE 4 figure grid reference
is 2577
Six figure grid reference
A – 256778
B – 258775
SIX FIGURE GRID REFERENCE : SIX FIGURE GRID REFERENCE 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 G 20 mm a b
Try out in tutorials!!!!!! : Try out in tutorials!!!!!!