What Is a densitometer in forestry?

What Is a densitometer in forestry?

The GRS Densitometer is a tool that uses a mirror to project a view of the sample location point in the canopy above to the person holding the Densitometer on the ground. Unlike other methods of determining canopy closure, the GRS Densitometer can be aligned to give an exact vertical line-of-sight into the canopy.

How do you estimate a tree canopy cover?

Canopy cover is estimated by measuring a grid of points on the survey plot with the tube. The result of each individual measurement is recorded as 1 if the view is obstructed and 0 otherwise. Canopy cover is then estimated as the mean of these binomial (Bernoulli) variables.

What does a spherical Densiometer measure?

A new instrument called a “spherical densiometer” has been described for estimating forest overstory density. 2 This pocket-type instrument employs a mirror with spherical curvature which makes possible the reflection of a large overhead area.

How does a densiometer work?

The densitometer is basically a light source aimed at a photoelectric cell. It determines the density of a sample placed between the light source and the photoelectric cell from differences in the readings. Modern densitometers have the same components, but also have electronic integrated circuitry for better reading.

How do you measure forest cover?

Canopy cover is calculated from the number of squares on the mirror filled with vegetation. The angular densiometer has a convex mirror, a compass, a bubble level, and a fixed eyesight. It produces a clearer image and a more exact estimation of canopy cover than the convex spherical densiometer.

What is canopy cover?

“Canopy cover is a measure of the percentage of ground covered by a vertical projection of the tree. canopy. In SNAMP, it is collected using point measurements (yes/no canopy cover).”

What is percentage canopy cover?

Stand percent canopy cover is the percentage of the ground area that is directly covered with tree crowns.

What is forest density?

Definition: Forest Canopy Density (FCD) refers to the proportion of an area in the field/ground that is covered by the crown of trees and is expressed in percentage of the total area.

What is the difference between forest cover and tree cover?

The information on forest and tree cover is obtained from two different sources. Forest cover is obtained from wall to wall mapping of the country using satellite data, whereas tree cover is estimated partly using high resolution data and partly from field inventory data of Trees Outside Forest (TOF).

What is crown cover in forestry?

Crown is the top part of the tree from which branches grow above the stem.

What material is used for canopy?

When it comes to canopy top materials there are three main options; polyester, polyethylene, and vinyl.

What’s a densitometer?

Definition of densometer : an instrument for measuring the porosity of paper by forcing air through it.

How much does a densitometer cost?

The prices of some systems can be as low as 6.000 USD or less, while the newest, high-tier systems may cost as much as 30.000 USD.