Section 7.
Data and variables
The LI-710 begins measuring parameters and recording raw data in its volatile
memory almost immediately after it is powered on. After it has recorded about 30
minutes of data (around 18,000 data points) it computes results for that time period.
These results represent the first computed output from the device - evapo-
transpiration and other computed parameters for the previous 30 minutes. The res-
ults will be reported until the next results are ready. See The XT (trigger) command on
page3-2 for more details.
Fluxes - ET, LE, and H (evapotranspiration, latent energy, or heat) - represent a
quantity of something exchanged over a time period, over an area. Eva-
potranspiration is reported as mm. It is the total (millimeters) water vapor
exchanged over the measurement period, over the fetch footprint around the sensor
for a 30-minute period. Other computed parameters - VPD, PA, TA, RH, SVP, and
TD (vapor pressure deficit, atmospheric pressure, air temperature, relative humidity,
saturation vapor pressure, and dewpoint temperature) are the average for the meas-
urement period.
The LI-710 sends up to four packets of results, each including up to nine variables.
Group 0: Results
Group 0 is the main set of measurements, including actual evapotranspiration, a set
of measured and computed parameters, the sequence number, and diagnostic
information for the measurement period.
7-1LI-710 Evapotranspiration Sensor Instruction Manual
To Next Page
Loading...