WATERSHED EXTRACTION PROGRAM AND WATERSHED EXTRACTION DEVICE

摘要

PPROBLEM TO BE SOLVED: To provide a computer program for extracting a correct watershed even by a user who does not know the watershed in advance. PSOLUTION: The watershed extraction program controls a computer. The computer holds altitude data indicating altitudes of a plurality of areas on a map. The areas include a first area. The watershed extraction program causes a processor of the computer to execute: a first procedure of searching for the watershed of water flowing into the first area to the upstream direction based on the altitude data; and a second procedure of deciding whether the area predetermined in the first procedure is correct or not. In the second procedure, when it is decided that the predetermined watershed is not correct, the watershed extraction program causes the processor to execute the first procedure again. PCOPYRIGHT: (C)2011,JPO&INPIT