| 摘要 |
PROBLEM TO BE SOLVED: To manage positional information while securing practical retrieval performance.SOLUTION: According to an information management method, a registration request of polygon information including a latitude and a longitude of each vertex of a polygon is accepted. Among unit rectangles which are formed each time a two-dimensional space including a range of the latitude and the longitude is equally divided in an X direction and a Y direction recursively for the same number of divisions, a minimum rectangle unit matching a minimum circumscribed rectangle of the polygon or including the minimum circumscribed rectangle is identified. One character string is generated by alternately arraying values applied to the identified unit rectangle and all the unit rectangles including the identified unit rectangle in accordance with the numbers of divisions in the X direction and the Y direction in order from a value corresponding to a large unit rectangle firstly for the X direction or the Y direction. A computer then executes processing for storing the polygon information in a storage section, while using the generated character string as a key, correspondingly to the key. |
