Method of transforming geographic coordinate

• US 7,903,005 B2
• Filed: 01/31/2008
• Issued: 03/08/2011
• Est. Priority Date: 08/02/2005
• Status: Active Grant

• Current Assignee: Naoki Ueda
• Original Assignee: Naoki Ueda
• Inventors: Ueda, Naoki
• Primary Examiner(s): WILLIAMS, HOWARD L
• Application Number:
  US12/010,924
• Publication Number:
  US 20100289675A1
• Time in Patent Office: 1,132 Days
• Field of Search: 341/83, 701/200
• US Class Current: 341/83
• CPC Class Codes: G01C 21/20 Instruments for performing navigational calculations G01C21/24, G01C21/26 take precedence
• CPC Class Codes: G09B 29/00 Maps; Plans; Charts; Diagrams, e.g. route diagram star maps G09B27/04; devices for holding or supporting maps A47B97/02; for computing purposes G06G1/14, G09B1/16; display boards G09F
• CPC Class Codes: G09B 29/10 Map spot or coordinate position indicators; Map reading aids optical projection apparatus per se G03B

Abstract

A method of transforming a geographic coordinate to a geographic location code includes the steps of: retrieving a latitude value and a longitude value of the geographic coordinate; quantizing the latitude value to a first integer value; quantizing the longitude value to a second integer value; converting the first integer value to a first code string, said first code string including a first digit representing a non-numeric character, a second digit representing a non-numeric character, and a third digit representing a numeric character; converting the second integer value to a second code string, said second code string including a fourth digit representing a non-numeric character, a fifth digit representing a non-numeric character, and a sixth digit representing a numeric character; and combining the first code string and the second code string to obtain the geographic location code having a fixed pattern of radix in a mixed radix notation system representation.

Claims

1. A method of transforming a geographic coordinate to a geographic location code, comprising the steps of:

retrieving a latitude value and a longitude value of the geographic coordinate;

quantizing the latitude value to a first integer value;

quantizing the longitude value to a second integer value;

converting the first integer value to a first code string, said first code string including a first digit representing a non-numeric character, a second digit representing a non-numeric character, and a third digit representing a numeric character;

converting the second integer value to a second code string, said second code string including a fourth digit representing a non-numeric character, a fifth digit representing a non-numeric character, and a sixth digit representing a numeric character;

and

combining the first code string and the second code string to obtain the geographic location code having a fixed pattern of radix in a mixed radix notation system representation.

2. The method according to claim 1, wherein, in the step of converting the first integer value to the first code string, said numeric character includes at least one of numeric characters from 0 to M−

1 in a notation of radix base of M, and said non-numeric character includes at least one of non-numeric characters from 0 to N−

1 in a notation of radix base of N wherein N and M are natural numbers.

3. The method according to claim 1, wherein, in the step of converting the second integer value to the second code string, said numeric character includes at least one of numeric characters from 0 to M−

1 in a notation of radix base of M, and said non-numeric character includes at least one of non-numeric characters from 0 to N−

1 in a notation of radix base of N wherein N and M are natural numbers.

4. The method according to claim 1, wherein, in the step of converting the first integer value to the first code string, said first code string further includes a seventh digit representing a non-numeric character, an eighth digit representing a non-numeric character, and a ninth digit representing a numeric character.

5. The method according to claim 1, wherein, in the step of converting the second integer value to the second code string, said second code string further includes a tenth digit representing a non-numeric character, an eleventh digit representing a non-numeric character, and a twelfth digit representing a numeric character.

6. The method according to claim 1, wherein, in the step of converting the first integer value to the first code string, said numeric character includes a decimal notation from 0 to 9;

and said non-numeric character includes a notation of radix base of 26 from A to Z or from a to z to represents a value from 0 to 25 in alphabetical order.

7. The method according to claim 1, wherein, in the step of converting the second integer value to the second code string, said numeric character includes a decimal notation from 0 to 9;

and said non-numeric character includes a notation of radix base of 26 from A to Z or from a to z to represents a value from 0 to 25 in alphabetical order.

8. A storage medium storing a program performing the method according to claim 1.