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National Topographic System (NTS) Documentation
The National Topographic System (NTS) system is used:
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Map showing NTS Grid Coverage
NTS Grid Expansion
National Topographic System File LayoutFields listed in size order, from largest to smallest. |
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| Field Number |
Name | Map Scale |
Description |
| 1 | Series | 1:1,000,000 |
4° Latitude Tall (All Zones)
16° Longitude Wide (80° to 88° N) High Arctic Zone
High Arctic Zone
560,340,120,
Arctic Zone
99, 89, 79, 69, 59, 49, 39, 29,
98, 88, 78, 68, 58, 48, 38, 28,
117,107, 97, 87, 77, 67, 57, 47, 37, 27,
Southern Zone
116,106, 96, 86, 76, 66, 56, 46, 36, 26, 16,
115,105, 95, 85, 75, 65, 55, 45, 35, 25, 15,
114,104, 94, 84, 74, 64, 54, 44, 34, 24, 14,
103, 93, 83, 73, 63, 53, 43, 33, 23, 13, 3,
102, 92, 82, 72, 62, 52, 42, 32, 22, 12, 2,
51, 41, 31, 21, 11, 1,
40, 30, 20, 10
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| 2 | Area | 1:250,000 |
8 Areas 2x4 (A to H) (80° to 88° N) High Arctic Zone 8 Areas 2x4 (A to H) (68° to 80° N) Arctic Zone
H G
E F
C D
B A
16 Areas 4x4 Grid (A to P) (40° to 68° N) Southern Zone
M N O P
L K J I
E F G H
D C B A
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| 3 | Sheet | 1:50,000 |
16 Sheets in a 4x4 Grid (1 to 16)
13 14 15 16
12 11 10 9
5 6 7 8
4 3 2 1
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| 4 | Quarter | 1:12,500 |
4 Quarters in a 2x2 Grid (A to D)
C D
B A
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| 5 | Unit | 1:1,2500 |
100 Units in a 10x10 Grid (1 to 100)
100 99 98 97 96 95 94 93 92 91
90 89 88 87 86 85 84 83 82 81
80 79 78 77 76 75 74 73 72 71
70 69 68 67 66 65 64 63 62 61
60 59 58 57 56 55 54 53 52 51
50 49 48 47 46 45 44 43 42 41
40 39 38 37 36 35 34 33 32 31
30 29 28 27 26 25 24 23 22 21
20 19 18 17 16 15 14 13 12 11
10 9 8 7 6 5 4 3 2 1
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| 6 | Block | 1: |
12 Units in a 4x3 Grid (A to L)
L K J I
E F G H
D C B A
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Programmer's Cheat Sheet for NTS
// IN AREA ORDER
SERIES 0 to 120 1st 4 x 8 or 4 x 16 1:1,000,000
AREA A to P or A to H 2nd 16 or 8 zones 1:250,000 4x4 or 2x2
SHEET 1 to 16 3rd Always 16 1:50,000 4x4
QUARTER A to D 1:12,500 2x2
UNIT 1 to 100 1:1,2500 10x10
BLOCK A to L
// IN DISPLAY ORDER
Example: C-26-F/93-K-11
// IN ENGLISH
Series 93, Area K, Sheet 11, Block F, Unit 26, Quarter C
// IN C
printf("NTS\n");
printf("%s-%s-%s/%s-%s-%s\n",mapquarter,mapunit,mapblock,mapseries,maparea,mapsheet);
