Setting up a measurement session

Working through the menu options

In normal use the SunData software calculates Leaf Area Index (LAI) based on readings from the SunScan probe and from the Beam Fraction Sensor (if fitted). These calculations also require information about the distribution of leaf angles and absorption of light by leaves within the canopy and knowledge of the solar angle calculated from the time of day and local latitude and longitude.

SunScan probe

 

 

Average PAR within canopy

 

 

Beam fraction

 

 

PAR above canopy

ï

 

 

 

 

 

 

 

 

Ratio of Direct to Total light

ï

 

ELADP setting

 

 

 

Leaf Angle Distribution

ï

Leaf Area Index

 

 

 

Absorption setting

 

 

Leaf PAR Absorption

 

Time and date

ü

 

ï

 

Latitude setting

 

 

Solar zenith angle

 

 

Longitude setting

 

 

 

 

 

Before it can make sensible calculations of the Leaf Area Index, SunData needs to know what values to use for the above settings.

♦ Press Menu, use the ← → arrow keys to select the Settings menu, and the ↑↓↓ keys to highlight Site, and press Enter. Type in a Name for your present site, and set the Latitude and Longitude by pressing Del and typing in the appropriate values. When everything is correct, to accept it

♦ Press Menu again, then select Time & Date and press Enter. Now set the local time and date in the dialog box. You also need to set the appropriate offset from GMT for your time zone. Set Local time is GMT to between -12.0 and +13.0 hours. Remember to make allowance for any special seasonal offsets, such as “Summer Time”, “Daylight Saving”. For example: British Summer Time is GMT+1, India is GMT+5.5, and USA EST is GMT - 5.0.

♦Press Enter to accept the settings and return to the Title screen.

Note: The date and time formats can be changed, but for the moment just get the information correct. To change am to pm, select it, and press p (or a).

♦ Use the ← → arrow keys to set the Absorption to 0.85. Set the ELADP (Ellipsoidal Leaf Angle Distribution Parameter) to 1. Press Enter to accept these settings.

Later sections in Measurement Options and LAI Theory give explanations and advice on choosing values for these parameters.

♦ Set the Display format to LAI. Leave the ‘Sample’ and ‘Plot’ names unchanged.

The options for Display (LAI, PAR and All) have an important effect on the display of readings but they also interact with the setting for Ext sensor (BFS or none) to determine the sequence of readings required.

18 • SunScan Tutorial

Document code: SS1-UM-1.05

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Delta Electronics SS1-UM-1.05 user manual Setting up a measurement session, Working through the menu options
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SS1-UM-1.05 specifications

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