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Main Title Properties of Designs for Sampling Continuous Spatial Resources from a Triangular Grid.
Author Overton, W. S. ; Stehman, S. V. ;
CORP Author Oregon State Univ., Corvallis. Dept. of Statistics. ;State Univ. of New York Coll. of Environmental Science and Forestry, Syracuse.;Corvallis Environmental Research Lab., OR.
Publisher c1993
Year Published 1993
Report Number EPA/600/J-94/083;
Stock Number PB94-144714
Additional Subjects Continuous sampling ; Environmental monitoring ; US EPA ; Variance(Statistics) ; Spatial distribution ; Grid generation(Mathematics) ; Computational grids ; Design ; Performance evaluation ; Reprints ; Environmental Monitoring and Assessment Program
Library Call Number Additional Info Location Last
NTIS  PB94-144714 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 24p
Precision of systematic designs for sampling continuous response variables defined over a continuous spatial region have been extensively investigated. Estimation of variance, particularly for triangular grids, has been given less attention. Two of the designs proposed for sampling environmental resources in the Environmental Protection Agency's Environmental Monitoring and Assessment Program (EMAP) are based on a triangular grid. Implementation of either design requires derivation and evaluation of a variance estimator adequate for the purposes of EMAP. The performance of the proposed variance estimator was assessed under various surface model representations of the continuous response variable. Of the designs examined, a tessellation-stratified design permitted better estimation of variance, and was generally more precise, than a strict systematic design. (Copyright (c) 1993 by Marcel Dekker, Inc.)