| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for evaluating disaster occurrence risk in a hard sedimentary rock area capable of extracting a disaster occurrence risky spot in the hard sedimentary rock area by combining an analysis result of a satellite image and an analysis result of DEM. SOLUTION: In this method for evaluating disaster occurrence risk in a hard sedimentary rock area, as for NDVI used often as an index for showing vegetation activity when analyzing the satellite image from a high resolution satellite image, rNDVI changed so that the value is raised in proportion to reduction of the vegetation activity is calculated, and an altitude variance quantity is calculated from the digital elevation model (DEM), and the rNDVI is multiplied by the altitude variance quantity, to thereby extract the disaster occurrence risky spot in the hard sedimentary rock area. COPYRIGHT: (C)2007,JPO&INPIT
|
