Publisher:
Journal of Agricultural, Biological, and Environmental Statistics
Abstract or Description:
The need for aquatic resource condition surveys at scales that are too extensive
to census has increased in recent years. Statistically designed sample surveys are intended
to meet this need. Simple or stratified random sampling or systematic survey
designs are often used to obtain a representative set of sites for data collection. However,
such designs have limitations when applied to spatially distributed natural resources,
like stream networks. Stevens and Olsen proposed a design that overcomes
the key limitations of simple, stratified random or systematic designs by selecting a
spatially balanced sample. The outcome of a spatially balanced sample is an ordered
list of sampling locations with spatial distribution that balances the advantages of simple
or stratified random samples or systematic samples. This approach can be used to
select a sample of sites for particular studies to meet specific objectives. This approach
can also be used to select a “master sample” from which subsamples can be drawn for
particular needs. At the same time, these individual samples can be incorporated into a
broader design that facilitates integrated monitoring and data sharing.