photocounts | R Documentation |
Counts of dead trees using aerial photographs and field counts in a 80ha parcel of land divided into 80 units. Field counts are more costly but also more accurate than those based on aerial photographs.
photocounts
A data frame with 80 observations and two variables:
count of dead trees from aerial photograph
count of dead trees from the field
Barrett, J. P. & Nutt, M. E. (1979). Survey sampling in the environmental sciences: A computer approach. Wentworth, NH: COMPress, Inc.
Gregoire, T. G. & Valentine, H. T. (2007). Sampling strategies for natural resources and the environment. Boca Raton, FL: Chapman & Hall/CRC.
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