grisons {forestinventory}

Data from a multiphase forest inventory in the canton of Grisons, Switzerland

Description

A dataset containing observations of 306 systematically arranged sample plots. Auxiliary information for all 306 plots is provided in the form of LiDAR canopy height metrics. For a systematic subsample of 67 out of the 306 plots, terrestrial information of the timber volume is provided from a terrestrial survey in the year 2007. Originally the inventory was carried out as a twophase inventory and has been artificially extended to a threephase inventory for demonstration purposes.

Usage

grisons

Format

data frame with 306 rows and 14 columns

Details

• phase_id_2p phase-membership of each observation for the twophase inventory. The large phase is indicated by 1, the terrestrial phase by 2.

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

• boundary_weights proportion of analysis-window for auxiliary information lying within the forest.

• mean mean canopy height at the sample location based on the LiDAR canopy height model.

• stddev standard deviation of the LiDAR canopy height model at the sample location.

• max maximum value of the LiDAR canopy height model at the sample location.

• q75 75%-Quantile of the LiDAR canopy height model at the sample location.

• smallarea smallarea-indicator for each observation.

• tvol terrestrial timber volume from field survey. Use for twophase-inventory.

• tvol.3p terrestrial timber volume from field survey. Use for threephase-inventory.

Note

There are additional columns in grisons to demonstrate the function-behaviors for special cases which might occur in a forest inventory

• phase_id_3p_nG0 one of the smallareas does not contain any terrestrial observation.

• phase_id_3p_nG1 one of the smallareas does contain only a single terrestrial observation.

• tvol.3p_nG0 Use as response variable to test phase_id_3p_nG0 for threephase-inventory.

• tvol.3p_nG1 Use as response variable to test phase_id_3p_nG1 for threephase-inventory.

We leave testing these special cases to the user.

Source

The terrestrial data are kindly provided by the forest service of the canton grisons.

The dataset was created and used within the framework of the publications listed under References.

References

Mandallaz, D., Breschan, J., & Hill, A. (2013). New regression estimators in forest inventories with two-phase sampling and partially exhaustive information: a design-based monte carlo approach with applications to small-area estimation. Canadian Journal of Forest Research, 43(11), 1023-1031.

Hill, A., Breschan, J., & Mandallaz, D. (2014). Accuracy assessment of timber volume maps using forest inventory data and LiDAR canopy height models. Forests, 5(9), 2253-2275.