ArcGIS不同插值方法在镇海湾海水无机氮评价中的应用

为充分发挥监测数据的作用,进而科学评价海洋环境和促进生态修复,文章分别采用ArcGIS的普通克里金法、反距离权重法和含障碍的样条函数3种插值方法,对2017年11月镇海湾海水无机氮监测数据进行插值分析,并通过插值结果比对选出最优方案。研究结果表明:通过对照点监测数据的验证,含障碍的样条函数的插值结果相对误差较小,比普通克里金法和反距离权重法更适用于海岸线复杂和岛屿众多的监测区域;根据含障碍的样条函数的插值结果制作镇海湾海水无机氮浓度空间分布图,并应用属性数据计算海水无机氮各类水质面积,与相关公报结论相符;合理采用ArcGIS插值方法对监测数据进行制图和计算,水质评价结果直观、可靠且具有应用价值。

Application of Different ArcGIS Interpolation Methods in the Evaluation of Inorganic Nitrogen of Seawater in Zhenhai Bay

In order to give full play to the role of monitoring data,so as to scientifically evaluate the marine environment and promote ecological restoration,this paper used ArcGIS to interpolate the monitoring data of inorganic nitrogen in Zhenhai Bay in November,2017. 3 interpolation methods were used in this study,and the optimal scheme was selected by comparing the interpolation results.The results showed that the interpolation error of Spline with Barriers was smaller than that of Ordinary Kriging and Inverse Distance Weighted,which was more suitable for the monitoring area with complex coastline and numerous islands.According to the interpolation results of Spline with Barriers,the spatial distribution map of inorganic nitrogen concentration was made,and the attribute data was used to calculate the proportion of various water quality areas in Zhenhai Bay,which was also consistent with the conclusion of the marine environmental status bulletin.In summary,through the reasonable use of ArcGIS interpolation method to map and calculate the monitoring data,the obtained water quality evaluation results were intuitive,reliable and had application value.