Walvoort D, Brus D, de Gruijter J (2025). spcosa: Spatial Coverage Sampling and Random Sampling from Compact Geographical Strata. doi:10.32614/CRAN.package.spcosa, R package version 0.4-5, https://CRAN.R-project.org/package=spcosa.

de Gruijter J, Brus D, Bierkens M, Knotters M (2006). Sampling for Natural Resource Monitoring. Springer, Berlin. ISBN 978-3-540-22486-0, doi:10.1007/3-540-33161-1.

Brus DJ, Spatjens LEEM, de Gruijter JJ (1999). “A sampling scheme for estimating the mean extractable phosphorus concentration of fields for environmental regulation.” Geoderma, 89, 129–148. doi:10.1016/S0016-7061(98)00123-2.

Walvoort DJJ, Brus DJ, de Gruijter JJ (2010). “An R package for spatial coverage sampling and random sampling from compact geographical strata by k-means.” Computers & Geosciences, 36, 1261–1267. doi:10.1016/j.cageo.2010.04.005.

Brus DJ (2022). Spatial sampling with R. CRC Press. doi:10.1201/9781003258940, https://github.com/DickBrus/SpatialSamplingwithR.

Corresponding BibTeX entries:

  @Manual{,
    title = {spcosa: Spatial Coverage Sampling and Random Sampling from
      Compact Geographical Strata},
    author = {Dennis Walvoort and Dick Brus and Jaap {de Gruijter}},
    year = {2025},
    note = {R package version 0.4-5},
    url = {https://CRAN.R-project.org/package=spcosa},
    doi = {10.32614/CRAN.package.spcosa},
  }

  @Book{,
    title = {Sampling for Natural Resource Monitoring},
    author = {J. {de Gruijter} and D. Brus and M. Bierkens and M.
      Knotters},
    publisher = {Springer},
    address = {Berlin},
    year = {2006},
    doi = {10.1007/3-540-33161-1},
    isbn = {978-3-540-22486-0},
  }

  @Article{,
    title = {A sampling scheme for estimating the mean extractable
      phosphorus concentration of fields for environmental regulation},
    author = {D. J. Brus and L. E. E. M. Spatjens and J. J. {de
      Gruijter}},
    journal = {Geoderma},
    year = {1999},
    volume = {89},
    pages = {129--148},
    doi = {10.1016/S0016-7061(98)00123-2},
  }

  @Article{,
    title = {An R package for spatial coverage sampling and random
      sampling from compact geographical strata by k-means},
    author = {D. J. J. Walvoort and D. J. Brus and J. J. {de
      Gruijter}},
    journal = {Computers & Geosciences},
    year = {2010},
    volume = {36},
    pages = {1261--1267},
    doi = {10.1016/j.cageo.2010.04.005},
  }

  @Book{,
    title = {Spatial sampling with R},
    author = {D. J. Brus},
    publisher = {CRC Press},
    year = {2022},
    doi = {10.1201/9781003258940},
    url = {https://github.com/DickBrus/SpatialSamplingwithR},
  }