利用插值试验分析采样网格对粒度趋势分析的影响  

COMPARISON BETWEEN GRAIN SIZE TRENDS DERIVED FROM IRREGULAR AND REGULAR SAMPLING GRIDS WITH THE HELP OF GIS INTERPOLATION TOOLS

作　　者：贾建军[1] 程鹏[2] 高抒[1] 

机构地区：[1]国家海洋局海底科学重点实验室,杭州310012 [2]南京大学海岸与海岛开发教育部重点实验室,南京210093

出　　处：《海洋地质与第四纪地质》2004年第3期135-141,共7页Marine Geology & Quaternary Geology

基　　金：国家自然科学青年基金项目(40206006);国家杰出青年基金资助项目(49785612)

摘　　要：利用地理信息系统软件ArcView3.2的空间分析功能,采用三次样条插值方法,对采自山东半岛月湖的表层沉积物的粒度参数进行插值。应用"粒度趋势分析"方法,选取一系列的特征距离值进行试验,从原始数据和插值后数据中提取净输运方向的信息。结果显示,原始的不规则采样点所得粒度趋势对于特征距离的选择很敏感,而插值后的规则格网在不同的特征距离下均表现出比较统一的粒度趋势信息。研究表明,规则格网较不规则格网采样点有许多优势,应用插值方法可有效地提高原始数据的信息含量及其质量。With the help of spatial analysis tools of GIS,spline interpolation method was employed to the data of grain size parameters over Yuehu Lagoon of Shandong peninsula.Whereafter,grain size trends analysis with a series of DC (from 100 m to 1000 m) adopted were carried out on the origin data of irregular sampling grid and the interpolated data of regular grid.Results of original data show that patterns of grain size trends change much with different DC,whilst the output of interpolated regular data are less dependent upon different DC.It is reasonable and testified that,compared with irregular grid,regular sampling grid has advantages in deriving grain size trends.Furthermore,employment of interpolation method to data of irregular grid can enhance the reliability and quality of net transport information.

关 键 词：地理信息系统 空间分析 粒度趋势分析 采样网格 三次样条插值 

分 类 号：P736.21[天文地球—海洋地质] P208[天文地球—海洋科学]