地球信息科学学报 ›› 2017, Vol. 19 ›› Issue (4): 549-558.doi: 10.3724/SP.J.1047.2017.00549
收稿日期:
2016-09-12
修回日期:
2016-12-14
出版日期:
2017-04-20
发布日期:
2017-04-20
作者简介:
作者简介:王学成(1991-),男,山东青岛人,硕士生,主要从事基于RS和GIS的森林资源调查方面研究。E-mail:
基金资助:
WANG Xuecheng1,2(), YANG Fei1,*(
), GAO Xing1, LI Li3
Received:
2016-09-12
Revised:
2016-12-14
Online:
2017-04-20
Published:
2017-04-20
Contact:
YANG Fei
摘要:
快速提取森林冰雪受灾范围,有利于准确掌握森林受灾情况,为此类灾害性气候事件防灾减灾、森林资源管理和生态保护提供科学依据。本文利用2001-2007年NDVI数据,提取灾前植被NDVI参考值和正常波动范围,结合2008年NDVI数据提取冰雪冻灾范围。该方法弥补了基于单一时相的传统方法(NDVI差值法)忽略植被指数正常波动的问题,分像元提取植被NDVI正常波动范围,使提取结果更加客观合理。与传统方法提取结果对比,省级尺度的验证结果相同(即森林受灾率均为34.72%,而实地调查森林受灾率35.3%),但2种方法在县市行政单元提取的森林受灾率相差较大。NDVI阈值法提取的森林冰雪受灾范围主要分布于湖南省南部地区,北部地区分布相对较少,而传统方法提取结果主要分布于湖南省北部地区,南部地区分布相对较少。根据实地考察资料显示,相比于传统方法,NDVI阈值法提取结果与实际森林冰雪冻灾空间分布信息更接近,精度更高,更适合于区域大尺度提取森林冰雪受灾范围。
王学成, 杨飞, 高星, 李丽. 基于NDVI阈值法的森林冰冻受灾范围精确提取[J]. 地球信息科学学报, 2017, 19(4): 549-558.DOI:10.3724/SP.J.1047.2017.00549
WANG Xuecheng,YANG Fei,GAO Xing,LI Li. Precise Extraction of Damaged Forest Range Caused by Ice-snow Frozen Disaster Based on the NDVI Threshold Method[J]. Journal of Geo-information Science, 2017, 19(4): 549-558.DOI:10.3724/SP.J.1047.2017.00549
表1
新算法提取冰雪受灾面积统计
森林受灾面积/万hm2 | 森林未受灾面积/万hm2 | 林地面积/万hm2 | 受灾面积理论值/万hm2 | 森林受灾率/% | 参考资料受灾率/% | 变化率N/% | |
---|---|---|---|---|---|---|---|
湖南省 | 415.967 | 781.997 | 1197.964 | 422.881 | 34.72 | 35.30 | 1.64 |
郴州市 | 59.049 | 73.664 | 132.713 | 58.924 | 44.49 | 44.40 | 0.21 |
衡阳市 | 30.556 | 40.634 | 71.190 | 42.429 | 42.92 | 59.60 | 27.98 |
衡东县 | 4.280 | 6.385 | 10.666 | 7.707 | 40.13 | 72.26 | 44.46 |
浏阳市 | 9.924 | 26.381 | 36.305 | 8.568 | 27.33 | 23.60 | 15.83 |
江永县 | 6.205 | 3.036 | 9.241 | 5.160 | 67.15 | 55.84 | 20.25 |
道县 | 7.155 | 6.523 | 13.679 | 8.358 | 52.31 | 61.10 | 14.39 |
新田县 | 1.513 | 2.770 | 4.283 | 2.743 | 35.32 | 64.05 | 44.86 |
表2
传统方法提取冰雪受灾面积统计
森林受灾面积/万hm2 | 森林未受灾面积/万hm2 | 林地面积/万hm2 | 受灾面积理论值/万hm2 | 森林受灾率/% | 参考资料受灾率/% | 变化率N/% | |
---|---|---|---|---|---|---|---|
湖南省 | 373.206 | 701.739 | 1074.945 | 379.456 | 34.72 | 35.30 | 1.65 |
郴州市 | 46.444 | 73.902 | 120.345 | 53.43 | 38.59 | 44.40 | 13.08 |
衡阳市 | 34.238 | 33.351 | 67.589 | 40.283 | 50.66 | 59.60 | 15.01 |
衡东县 | 3.431 | 6.996 | 10.427 | 7.535 | 32.90 | 72.26 | 54.46 |
浏阳市 | 20.491 | 14.115 | 34.606 | 8.167 | 59.21 | 23.60 | 150.90 |
江永县 | 3.602 | 4.968 | 8.570 | 4.785 | 42.03 | 55.84 | 24.73 |
道县 | 3.461 | 8.906 | 12.367 | 7.556 | 27.99 | 61.10 | 54.19 |
新田县 | 0.996 | 1.921 | 2.917 | 1.868 | 34.14 | 64.05 | 46.70 |
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