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-- Reference --

# Standard Grid Square and Grid Square Code Used for the Statistics (Announcement No. 143 by the Administrative Management Agency on July, 12, 1973)

The Standard Grid Square and the Grid Square Code used for the statistics are as follows:

(Refer to: Explanation Chart)

## 1. Standard Grid Square

The Standard Grid Square includes the following three kinds of Grid Squares:

the Basic Grid Square;

the Divided Grid Square that a Basic Grid Square has divided;

the Integrated Grid Square that some Basic Grid Squares have integrated.

### (1) Basic Grid Square

The Basic Grid Squares are to be compiled according to the methods shown below:

A. Compile the Primary Area Partition by dividing the whole area of Japan into blocks measuring 1 degree of longitude by 2/3 degree of latitude.

B. Divide the Primary Area Partition into 64 (8 by 8) equal parts along longitude and latitude to compile the Secondary Area Partitions.

C. Divide the Secondary Area Partition into 100 (10 by 10) equal parts along longitude and latitude to compile the Third Area Partitions, which are equal to the Basic Grid Squares.

### (2) Divided Grid Square

The Divided Grid Square includes the following three kinds of Grid Squares:

the Half Grid Square that the side length is one half of the Basic Grid Square;

the Quarter Grid Square that the side length is one quarter of the Basic Grid Square;

the Eighth Grid Square that the side length is one eighth of the Basic Grid Square.

The following table shows how to compile:

Category | How to compile |
---|---|

Half Grid Square | Divide a Basic Grid Squares into 4 equal parts: 2 by 2. |

Quarter Grid Square | Divide a Basic Grid Squares into 16 equal parts: 4 by 4. |

Eighth Grid Square | Divide a Basic Grid Squares into 64 equal parts: 8 by 8. |

### (3) Integrated Grid Square

The Integrated Grid Square includes the following three kinds of Grid Squares:

The Double Grid Square that the side length is double of the Basic Grid Square;

The Quintuple Grid Square that the side length is quintuple of the Basic Grid Square;

The Decuple Grid Square that the side length is decuple of the Basic Grid Square.

The following table shows how to compile:

Category | How to compile |
---|---|

Double Grid Square | Divide a Secondary Area Partition into 25 equal parts: 5 by 5 |

Quintuple Grid Square | Divide a Secondary Area Partition into 4 equal parts: 2 by 2 |

Decuple Grid Square | Equal to a Secondary Area Partition |

## 2. Standard Grid Square Code

The Standard Grid Square Code is defined as follows:

### (1) Basic Grid Square Code

Basic Grid Square Code is an 8-digit number. The first 4-digits indicates the Primary Partitions, the next 2-digits indicates the Secondary Partitions, and the last 2-digits indicates the Third Area Partitions.

A. The code indicating the Primary Area Partition is a 4-digit number. The first 2-digits indicates the figure which multiplied the degree of the southernmost latitude of a Partition by 1.5. The last 2-digits indicates the last 2 digits of the degree of the westernmost longitude of a Partition.

B. The code indicating the Secondary Area Partition is a 2-digit number. There are 64 (8 by 8) Secondary Area Partitions in one Primary Area Partition. The first 1-digit indicates the number of a Partition which is numbered from the southernmost Partition to the north in a Primary Area Partition, and begins with 0 and ends with 7. The last 1-digit indicates the number of a Partition which is numbered from the westernmost Partition to the east in a Primary Area Partition, and begins with 0 and ends with 7.

C. The code indicating the Third Area Partition is a 2-digit number. There are 100 (10 by 10) Third Area Partitions in one Secondary Area Partition. The first 1-digit indicates the number of a Partition which is numbered from the southernmost Partition to the north in a Secondary Area Partition, and begins with 0 and ends with 9. The last 1-digit indicates the number of a Partition which is numbered from the westernmost Partition to the east in a Secondary Area Partition, and begins with 0 and ends with 9.

### (2) Divided Grid Square Code

Divided Grid Square Code is as follows:

A. The code indicating the Half Grid Square is a 9-digit number which consists of the Basic Grid Square Code and one more digit as the ninth digit. There are 4 (2 by 2) Half Grid Squares in a Basic Grid Square. The ninth digit indicates the number of a Half Grid Square which is numbered by the following order: southwest is 1, southeast is 2, northwest is 3, and northeast is 4.

B.The code indicating the Quarter Grid Square is a 10-digit number which consists of the Half Grid Square Code and one more digit as the tenth digit. There are 4 (2 by 2) Quarter Grid Squares in a Half Grid Square. The tenth digit indicates the number of a Quarter Grid Square which is numbered by the same order as the Half Grid Square: southwest is 1, southeast is 2, northwest is 3, and northeast is 4.

C.The code indicating the Eighth Grid Square is a 11-digit number which consists of the Quarter Grid Square Code and one more digit as the eleventh digit. There are 4 (2 by 2) Eighth Grid Squares in a Quarter Grid Square. The eleventh digit indicates the number of a Eighth Grid Square which is numbered by the same order as the Half Grid Square: southwest is 1, southeast is 2, northwest is 3, and northeast is 4.

### (3) Integrated Grid Square Code

Integrated Grid Square Code is as follows:

A. The code indicating the Double Grid Square is a 9-digit number which consists of the first 6-digits of the Basic Grid Square Code and three more digits as the seventh to ninth digits. There are 25 (5 by 5) Double Grid Squares in a Secondary Area Partition. The seventh digit indicates the number of a Double Grid Square which is numbered by the following order: 0,2,4,6 and 8 from the southernmost Square to the north in a Secondary Area Partition. The eighth digit indicates the number of a Double Grid Square which is numbered by the following order: 0,2,4,6 and 8 from the westernmost Square to the east in a Secondary Area Partition. The ninth digit is 5.

B.The code indicating the Quintuple Grid Square is a 7-digit number which consists of the first 6-digits of the Basic Grid Square Code and one more digit as the seventh digit. There are 4 (2 by 2) Quintuple Grid Squares in a Secondary Area Partition. The seventh digit indicates the number of a Quintuple Grid Square which is numbered by the following order: southwest is 1, southeast is 2, northwest is 3, and northeast is 4.

C.The code indicating the Decuple Grid Square is a 6-digit number which is the same code as the first 6-digits of the Basic Grid Square Code.

### (4) Partially Omitted Code

When you use the Standard Grid Square Code, the upper digits of the code can be omitted. In this case, you need to clarify where the shortened code should be located in the Standard Grid Square Code.