Remote Sensing Assessment of Forest Fire Damage Degree in Bilahe Forest Farm,Inner Mongolia

doi:10.13466/j.cnki.lyzygl.2018.01.013

Abstract

Abstract:

In order to evaluate the forest fire loss occurred on May 2,2017 in Bilahe Forest Form in Inner Mongolia,the Landsat8 satellite images which were pictured pro and post the fire were selected as the study data,the difference Normalized Burn Ratio(dNBR) was calculated by means of the two images.Through the combination of visual interpretation and mathematical statistics,the fire severity evaluation index was constructed.The damage of forest fire in Bilahe forest was quantitatively evaluated.By using the field survey GPS data and GF-2 satellite data to verify the damage degree of the forest fire,the grading accuracy was 86.39%.The results show that the moderate damage area is the largest in Bilahe Forest Farm in Inner Mongonlia,which is 4 685.09 hm²,accounting for 40.35% of the total burned area,followed by low damage area of 4 213.1hm²,accounting for 36.28% of the total burned area,high damage area is 1 031.03hm²,accounting for 8.88% of the total burned area,and the unburned damage area is 906.57hm²,accounting for 7.81% of the total burned area.The affected forest of the typical vegetation is mainly distributed in the moderate damage and low damage area.The affected grassland is mainly distributed in the low damage area.

Key words: forest fire, difference Normalized Burn Ratio, remote sensing, evaluation index, loss assessment

CLC Number:

LIU Shuchao, CHEN Xiaozhong, QIN Xianlin, SUN Guifen, LI Xiaotong. Remote Sensing Assessment of Forest Fire Damage Degree in Bilahe Forest Farm,Inner Mongolia[J]. FOREST RESOURCES WANAGEMENT, 2018, 0(1): 90-95.

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受害程度分级	最小值	最大值	平均值	标准差	像元数
未受害	-0.1278	0.0602	-0.0341	0.0488	30
轻度受害	0.1796	0.3844	0.2661	0.0623	30
中度受害	0.3975	0.7243	0.5681	0.0771	30
重度受害	0.7696	0.9494	0.8807	0.0402	30

受害程度分级	dNBR值
未受害	≤0.1
轻度受害	0.1~0.38
中度受害	0.38~0.72
重度受害	≥0.72

受害程度分级	面积/hm²
未受害	906.57
轻度受害	4213.10
中度受害	4685.09
重度受害	1031.03

受害程度分级	森林			草地
受害程度分级	正确像元数	错分像元数	正确率/%	正确像元数	错分像元数	正确率/%
未受害	45	5	90	44	6	88
轻度受害	40	10	80	41	9	82
中度受害	45	5	90	46	4	92
重度受害	41	9	82	9	1	90
总计	171	29	85.5	140	20	87.5