基于遥感特征变量的高山松碳储量抽样估算

Sampling Estimation of Pinus densata Carbon Storage Based on Remote Sensing Feature Variables

  • 摘要: 以Landsat 8 OLI遥感影像为数据源,结合香格里拉市森林资源二类调查数据,在可靠性为95%,抽样精度分别为95%、90%、85%的3种情况下,基于遥感特征变量采用分层抽样对高山松碳储量进行估算,并与一般分层抽样、系统抽样结果进行比较分析。结果表明:遥感特征变量的筛选中,相关性最强的4个依次为11窗口第4波段信息熵(R11B4EN)、11窗口第4波段均值(R11B4ME)、11窗口第7波段协同性(R11B7HO)、11窗口第2波段二阶矩(R11B2SM)。在相同抽样设计精度下,抽样单元数量均呈现系统抽样>一般分层抽样>遥感分层抽样的规律。在95%和85%的抽样设计精度下,采用11窗口第2波段二阶矩(R11B2SM)的实际抽样精度最高,误差最小。可见,基于遥感特征变量的分层抽样可为森林碳储量调查提供参考。

     

    Abstract: Using Landsat 8 OLI remote sensing image as data source, combined with the second-class survey data of forest resources in Shangri-La City, stratified sampling was used to estimate the carbon storage of Pinus densata based on remote sensing characteristic variables under 3 conditions of 95% reliability and 95%, 90% and 85% sampling accuracy respectively. The results are compared with those of general stratified sampling and systematic sampling. The results show as follows: In the screening of remote sensing feature variables, 4 with the strongest correlation are successively the information entropy of the fourth band in the 11th window(R11B4EN), the mean of the 4th band in the 11th window(R11B4ME), the synergy of the 7th band in the 11th window(R11B7HO), and the 2nd moment in the 2nd band in the 11th window(R11B2SM). Under the same sampling design accuracy, the number of sampling units presents the rule of system sampling > general stratified sampling > remote sensing stratified sampling. Under the sampling design accuracy of 95% and 85%, the actual sampling accuracy is the highest and the error is the smallest when using the 11th window second-band 2nd moment(R11B2SM). Therefore, stratified sampling based on remote sensing characteristic variables can provide reference for forest carbon storage investigation.

     

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