Nomenclature of topographic maps of Vietnam

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Nomenclature of topographic maps depends on map scale. There are the following scales of topographic maps of Socialist Republic of Vietnam:

-1 : 1 000 000;

-1 : 500 000;

-1 : 250 000;

-1 : 100 000;

-1 : 50 000;

-1 : 25 000;

-1 : 10 000.

 

Maps sheets of scale 1: 1 000 000 are denoted by four capital letters of the English alphabet and figures. The first symbol indicates the hemisphere:

-N – northern;

-S – southern.

 

The second character indicates the zone number 4 ° from A to U, starting from the equator towards the two hemispheres.

The next two digits indicate the number of zones of ruling the earth ellipsoid, starting with the meridian of 180 °. Is from 1 to 60, increasing in the east direction (for example: NF-48).

 

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Maps of scale 1: 500 000 are designated by capital letters of English alphabet A, B, C, D which are recorded after the sheet's nomenclature of maps of scale 1: 1 000 000 (for example NC-48-C).

 

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Maps of scale 1: 250 000 are designated by figures from 1 to 16 which are recorded after the sheet's nomenclature of maps of scale 1: 1 000 000 (for example: NF-48-16).

 

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Maps of scale 1: 100 000 are designated by four figures. The first two figures are started from 00 (east meridian 75 °) and are increased towards the east. The next two figures are started from 01 (southern parallel 4 °) and are increased in the direction of the north (for example 5949).

 

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Examples of nomenclatures of topographic maps are given in the table 1.

 

Table 1 - Sizes of maps sheets of DTM

 

№

Scale

Number of sheets of scale

1: 1 000 000

Sizes of internal frames

Examples of nomenclatures

Note

between parallels

between  meridians

1

1: 1 000 000

1

4°

6°

NA-01

SU-60

N - northern hemisphere

S - southern hemisphere

2

1: 500 000

4

2°

3°

NF-48-A

NF-48-B

NF-48-C

NF-48-D

A - northwest

B - northeast

C - southeast

D - southwest

3

1: 250 000

16

1°

1°30'

NF-48-01

NF-48-04

NF-48-13

NF-48-16

01 - northwest

04 - northeast

13 - southwest

16 - southeast

4

1: 100 000

96

30'

30'

0099

9999

0001

9901

northwest  (NM-43-09)

northeast (NM-51-16)

southwest (NA-43-13)

southeast (NA-51-12)

5

1: 50 000

384

15'

15'

5949-1

5949-2

5949-3

5949-4

1 (I) - northeast

2 (II) - southeast

3 (III) - southwest

4 (IV) - northwest

6

1: 25 000

1536

7'30"

7'30"

5949-1-TB

5949-1-DB

5949-1-TN

5949-1-DN

TB - northwest

DB (ĐB) - northeast

TN - southwest

DN (ĐN) - southeast

7

1: 10 000

6144

3'45"

3'45"

5949-1-TB-1

5949-1-TB-2

5949-1-TB-3

5949-1-TB-4

1 - northwest

2 - northeast

3 - southeast

4 - southwest