Evaluation of the Forest Fire Areas in the Hill Region in South China on the Basis of MODIS Data

Zhang Chungui; Huang Chaofa; Pan Weihua; Lin Jing

Vol.18, NO.1, 2007

Article Contents

Article Navigation > Journal of Applied Meteorological Science > 2007 > 18(1): 119-123

Zhang Chungui, Huang Chaofa, Pan Weihua, et al. Evaluation of the forest fire areas in the hill region in South China on the basis of modis data. J Appl Meteor Sci, 2007, 18(1): 119-123.

Citation:

Zhang Chungui, Huang Chaofa, Pan Weihua, et al. Evaluation of the forest fire areas in the hill region in South China on the basis of modis data. J Appl Meteor Sci, 2007, 18(1): 119-123.

Zhang Chungui, Huang Chaofa, Pan Weihua, et al. Evaluation of the forest fire areas in the hill region in South China on the basis of modis data. J Appl Meteor Sci, 2007, 18(1): 119-123.

Citation:

Zhang Chungui, Huang Chaofa, Pan Weihua, et al. Evaluation of the forest fire areas in the hill region in South China on the basis of modis data. J Appl Meteor Sci, 2007, 18(1): 119-123.

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Evaluation of the Forest Fire Areas in the Hill Region in South China on the Basis of MODIS Data

1.
Fujian Provincial Meteorological Institute, Fuzhou 350001
2.
Fujian Provincial Forest Fire Management Headquarters Office, Fuzhou 350001

Received Date: 2005-09-27
Rev Recd Date: 2006-06-23
Publish Date: 2007-02-28

Abstract

Abstract

Based on the MODIS data which have 250 meters resolution and the ground investigation data of forest fire in 2004, the study taking Fujian Province as an example analyzes and discusses the technological method about how to assess the forest fire acreages when there is a forest fire in hills regions in the southeast China.According to a number of forest fires cases happened in 2004, 35 typical cases are selected, the corresponding MODIS data characteristics are calculated and analyzed before and after the forest fires. The results show that the reflectivity of the near infrared channel (CH2) and the value of normalized difference vegetation index (NDVI) of MODIS data before the forest fire are obviously lower than after it, whatever are the data such as the minimum value of CH2 and NDVI, the maximum value or the average value. Moreover, the average reflectivity of CH2 declines by 6.65 points, and the average value of NDVI decreases by 0.23 points. The reflectivity of the visible channel (CH1) of MODIS data before the forest fire is much lower than that after it, and the ratio of samples to the total samples is 71%, but on the opposite, the ratio of samples with higher values reaches 29%. From the analysis, the reflectivity of CH2 channel of MODIS data and the NDVI value have different characteristics obviously before and after the forest fire on the mountain areas in Southern China, which can be used as an index to evaluate the size of the fire areas after the forest fire.On the basis of analyzing the properties of MODIS data to detect the forest fire areas, the method of comparing the dispersed graph between reflectivity of the MODIS near-infrared channels and NDVI before and after the forest fires is adopted in the study, combining with the pseudo color composite image in the fire regions, some means to evaluate the forest fire acreages with the help of using ROI function to deal with MODIS data in ENVI software are found.Finally, the study shows that the overall estimate error of burned acreages is 15 hectares in the evaluated 35 forest fire sample cases in 2004. At the same time, the calculated forest fire areas by the method of analyzing the reflectivity of the near-infrared channel (CH2) of MODIS data are showed and they are close to the actual results by ground investigation, and the areas of forest fire calculated by the means of adopting the value of NDVI are near the areas of the destroyed forest from ground investigation. Moreover, the results indicate it is significant that to evaluate the forest fire areas by the means of applying the MODIS data in hills of Southern China can be used in daily operational works and can meet the needs of monitoring the forest fire.
- MODIS data;
- forest fire area;
- evaluation

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References(9)

Figures and Tables

图 1 2004年10月17日火灾前 (a) 和19日火灾后 (b) MODIS卫星影像

Fig. 1 MODIS images on Oct 17 (a) and Oct 19 (b) in 2004 before and after the forest fire

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图 2 灾前灾后CH2反射率二维散点图

Fig. 2 Scatter plot of CH2 reflectivity before and after the forest fire

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图 3 灾前灾后NDVI值二维散点图

Fig. 3 Scatter plot of NDVI value before and after the forest fire

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