# angleGauge-class: Class '"angleGauge"': For Angle Gauge Sampling Methods In sampSurf: Sampling Surface Simulation for Areal Sampling Methods

## Description

A subclass of "`ArealSampling`" that can be used to create objects that encapsulate all the parameters necessary for, e.g., horizontal point (prism) sampling of standing trees (or downed logs).

## Objects from the Class

Objects can be created by calls of the form `new("angleGauge", ...)`, and while this is reasonable with this class because there are no graphical slots, it is still not recommended. The preferred method for creating new objects is via the `angleGauge` constructor.

## Slots

In addition to those slots in class "ArealSampling," the following are defined...

`angleDegrees`:

Object of class `"numeric"`: The gauge angle in degrees, normally in the range 0 < `angleDegrees` <= 6.5 degrees.

`angleRadians`:

Object of class `"numeric"`: The gauge angle in radians.

`diopters`:

Object of class `"numeric"`: The prism angle in diopters (Delta).

`k`:

Object of class `"numeric"`: Angle gauge constant (dimensionless); i.e., 2*sin(angleRadians/2), where angleRadians is `angleRadians` above.

`prf`:

Object of class `"numeric"`: The plot radius factor; English=ft/in, metric=m/cm.

`PRF`:

Object of class `"numeric"` The plot radius factor; English=ft/ft, metric=m/m.

`alpha`:

Object of class `"numeric"` The plot radius proportionality constant; English=ft/ft, metric=m/m.

`baf`:

Object of class `"numeric"`: The corresponding basal area factor in the appropriate units; English=ft{}^2/acre, metric=m^2/ha.

`df`:

Object of class `"numeric"`: Diameter factor for horizontal line sampling in inches or cm.

`DF`:

Object of class `"numeric"`: Diameter factor for horizontal line sampling in feet or meters.

## Extends

Class `"ArealSampling"`, directly.

## Methods

horizontalPointIZ

```signature(standingTree = "standingTree", angleGauge = "angleGauge")```: Object constructor for horizontal point sampling.

summary

`signature(object = "angleGauge")`: Show a summary of the `object`.

Jeffrey H. Gove

## References

T. G. Gregroire and H. T. Valentine. 2009. Sampling strategies for natural resources and the environment. Chapman and Hall/CRC, 496p.

The "`ArealSampling`" class.
 `1` ```showClass("angleGauge") ```