Crown mirror - densiometer

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{{Ficontent}}
{{construction}}
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==General description==
 
==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 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.
 
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.
  
<gallery width=300px height=300px>
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<gallery>
 
file: crown-mirror-01_portrait.jpg|Figure 1: Crown mirror - densiometer
 
file: crown-mirror-01_portrait.jpg|Figure 1: Crown mirror - densiometer
 
file: crown-mirror-02_measurement.jpg|Figure 2: Live view measuring crown margin
 
file: crown-mirror-02_measurement.jpg|Figure 2: Live view measuring crown margin
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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.
  
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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# Select an easy to recognize starting point
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# Walk around the crown perimeter and observe the corresponding crown through the instrument till you reach the starting point
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A field survey with the crown mirror densiometer can be improved by using additionally e.g. a [[walktax]] for the crown area conduction.
 
{| class="wikitable"
 
{| class="wikitable"
 
!Advantages
 
!Advantages
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* [[forest inventory]]
 
* [[forest inventory]]
 
* [[environmental examination]]
 
* [[environmental examination]]
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==Related articles==
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{{Studienbeiträge}}
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[[Category:Measurement devices]]
[[Category:]]
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Latest revision as of 12:53, 27 October 2013

[edit] 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.

[edit] 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.

  1. Select an easy to recognize starting point
  2. Walk around the crown perimeter and observe the corresponding crown through the instrument till you reach the starting point

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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