zberg {forestinventory}

Data from a multiphase forest inventory at the zurichberg (zurich), switzerland

Description

A dataset from 1991 containing 1203 sample plots observations from a forest inventory using cluster-sampling. The large phase comprises 298 clusters. Terrestrial information of the stem number as well as the basal area is available for a systematic subsample of 73 clusters. Auxiliary information at all 2103 sample plots were derived by stand maps. Originally the inventory was carried out as a twophase inventory and has been artificially extended to a threephase inventory for demonstration purposes.

Usage

zberg

Format

data frame with 1203 rows and 12 columns

Details

• cluster cluster identification. Maximum number of sample plots per cluster is 5.

• phase_id_2p phase-membership of each observation for the twophase inventory. The first phase is indicated by 1, the second (i.e. terrestrial) phase by 2.

• phase_id_3p the phase-membership of each observation for the threephase inventory, i.e. the first phase (0), the second phase (1) and third (terrestrial) phase (2). Note: The threephase sample scheme was artificially created for demonstration purposes of the threephase-functions.

• stade development stage at sample plot location based on the stand map. Categorical variable of class factor with 4 levels.

• melange degree of mixture at sample plot location based on the stand map. Categorical variable of class factor with 2 levels.

• couver crown-coverage at sample plot location based on the stand map. Categorical variable of class factor with 2 levels.

• stem stem number derived at field survey.

• basal basal area derived at field survey.

• ismallg23 indicator for small area 2 and 3 for each observation.

• ismallold indicator for small area 1 for each observation.

Source

Data provided by D.Mandallaz

References

Mandallaz, Daniel (1991). A unified approach to sampling theory for forest inventory based on infinite population and superpopulation models. http://dx.doi.org/10.3929/ethz-a-000585900

Mandallaz, Daniel (1993). Geostatistical methods for double sampling schemes. application to combined forest inventories. Chair of Forest Inventory and Planning, Swiss Federal Institute of Technology (ETH). http://dx.doi.org/10.3929/ethz-a-000943897