Crown mirror - densiometer
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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. | ||
| − | + | <gallery width=300px height=300px> | |
| − | + | file: crown-mirror-01_portrait.jpg|Figure 1: Crown mirror - densiometer | |
| + | file: crown-mirror-02_measurement.jpg|Figure 2: Live view measuring crown margin | ||
| + | </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. | ||
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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 22:15, 13 June 2012
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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.
Figure 1: Crown mirror - densiometer
Figure 2: Live view measuring crown margin
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 |
