等级 | 类型 | SPI值 |
1 | 特涝 | 2.0 < SPI |
2 | 重涝 | 1.5 < SPI ≤ 2.0 |
3 | 中涝 | 1.0 < SPI ≤ 1.5 |
4 | 轻涝 | 0.5 < SPI ≤ 1 |
5 | 正常 | −0.5 < SPI ≤ 0.5 |
6 | 轻旱 | −1.0 < SPI ≤ −0.5 |
7 | 中旱 | −1.5 < SPI ≤ −1.0 |
8 | 重旱 | −2.0 < SPI ≤ −1.5 |
9 | 特旱 | SPI ≤ −2.0 |