[1]GAO Yun-fei,LI Zhi-guang,YANG Sheng-tian,et al.Study on Canopy Density Retrieval Method from SPOT5[J].Research of Soil and Water Conservation,2012,19(02):267-270.
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Study on Canopy Density Retrieval Method from SPOT5
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
19
Number of periods:
2012 02
Page number:
267-270
Column:
Public date:
2012-04-20
- Title:
- Study on Canopy Density Retrieval Method from SPOT5
- Keywords:
- SPOT5; canopy density; retrieval; factors of biological-control
- CLC:
- TP79
- DOI:
- -
- Abstract:
- In order to determine the value of regional factors of biological-control in forest,Yunyang County in Chongqing was selected as the study area.On the basis of investigated canopy density data from 58 forest blocks,we calculated the average and standard deviation of digital number (DN) for each band of corresponded SPOT5,then analyzed the stability of SPOT5 in various forest canopy density.Regression and correlation analysis were taken between 38 different random selected canopy density data and corresponding average DN values of each band for SPOT5,and we established the method of retrieving canopy density by combining different bands.The other 20 investigated canopy density data were applied for accuracy test.Our results showed,the average DN values in infrared red,red and green bands of SPOT5 manifested stable over various canopy density forest blocks,their maximum deviation are 13.8%,15.65%,24.52%,and their average deviation are 10.11%,10.94%,17.78%;red and green bands are the optimal combination for retrieving canopy density,their determination coefficient of fitting equation is 0.66.The accuracy test results showed,the maximum positive and negative deviation between retrieving results and investigation data is +16.92%,-16.06%,with an average deviation of -2.08%.According to 10% graduation statistics,the deviation of all the results were less than 15%,the general accuracy is relatively high.While the error of retrieving result was 20%,the maximum error of corresponding factors of biological-control was less than 10%,which can be used as the reference of calculating factors of biological-control in monitoring regional soil erosion.
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