Crown mirror - densiometer

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(Created page with " {{construction}} ==General description== The crown mirror consists of a gimble grip, where a plumb tube is installed with a mirror and a visor cross. The visor cross divides t...")
 
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The crown mirror densiometer is a device to plumb crown width, crown radius, crown area shadow or the crown projection to estimate the degree of canopy. A plumb-pipe with a mirror and a cross line are gimballed.
 
The crown mirror densiometer is a device to plumb crown width, crown radius, crown area shadow or the crown projection to estimate the degree of canopy. A plumb-pipe with a mirror and a cross line are gimballed.
  
[[file: crown-mirror-01_portrait.jpg|thumb|300px|Figure 1: Crown mirror]]
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<gallery width=300px height=300px>
 
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file: crown-mirror-01_portrait.jpg|Figure 1: Crown mirror - densiometer
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file: crown-mirror-02_measurement.jpg|Figure 2: Live view measuring crown margin
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</gallery>
  
 
==Handling==
 
==Handling==
 
To project the crown margin down to the ground, a manual lead and a line can be used to mark the crown limit on the ground – later the crown area can be measured at the ground.
 
To project the crown margin down to the ground, a manual lead and a line can be used to mark the crown limit on the ground – later the crown area can be measured at the ground.
[[file: crown-mirror-02_measurement.jpg|thumb|300px|Figure 2: Live view measuring crown margin]]
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To measure the canopy margin walk around the perimeter observing the corresponding crown and leave the line on the ground. A field survey with the crown mirror densiometer can be improved by using additionally e.g. a [[walktax]] for the crown area conduction.
 
To measure the canopy margin walk around the perimeter observing the corresponding crown and leave the line on the ground. A field survey with the crown mirror densiometer can be improved by using additionally e.g. a [[walktax]] for the crown area conduction.
 
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Revision as of 21:15, 13 June 2012

Construction.png sorry: 

This section is still under construction! This article was last modified on 06/13/2012. If you have comments please use the Discussion page or contribute to the article!

General description

The crown mirror consists of a gimble grip, where a plumb tube is installed with a mirror and a visor cross. The visor cross divides the canopy into 4 quads. The crown mirror densiometer is a device to plumb crown width, crown radius, crown area shadow or the crown projection to estimate the degree of canopy. A plumb-pipe with a mirror and a cross line are gimballed.

Handling

To project the crown margin down to the ground, a manual lead and a line can be used to mark the crown limit on the ground – later the crown area can be measured at the ground.

To measure the canopy margin walk around the perimeter observing the corresponding crown and leave the line on the ground. A field survey with the crown mirror densiometer can be improved by using additionally e.g. a walktax for the crown area conduction.

Advantages Disadvantages
hinges with ball bearings no application to measure or calculate directly canopy cover values
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