文章基本信息

标题：ANALYZING AMBIGUITIES IN DATA COLLECTION NETWORK DESIGN BY GEOSTATISTICAL ESTIMATION VARIANCE REDUCTION METHOD
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作者：Vanita Agnihotri ; Shakeel Ahmed
期刊名称：Journal of Environmental Hydrology (ältere Jahrgänge)
印刷版ISSN：1058-3912
电子版ISSN：1996-7918
出版年度：1997
卷号：5
出版社：IAEH
摘要：Ambiguities in the data collection network design mainly based on the geostatistical estimation variance reduction method have been analyzed using a few numerical examples. The method of locating new measurement points with the help of an estimation variance (also called kriging variance) map has an ambiguity on the number of new data collection points, and hence does not provide an optimal network. The method of optimizing measurement points by reducing estimation variance at the central point of the considered area has an ambiguity that the same network will be valid for an even much larger area, if the center remains unchanged. In the examples considered it was found that the kriging variance calculated for an estimation over the entire area/block increases if the area/block is increased keeping the center of the area unchanged for the same network. However, a few ambiguities were found while considering an area whose center point was also shifted with the origin. The exercise was repeated by arbitrarily adding some new data collection points to the considered network. Further, the method of estimating the mean of the parameter by ordinary kriging was applied to calculate the kriging variance for different networks. Although the ambiguity that the same network representing different areas remains, this method provides a comparatively lesser kriging variance.