Measurement Quick Start
3-9
Summary Records - A record of Type 2, 3, or 4. An Observation always has one of
each, for a total of three.
Type 2 records for measured columns represent initial values based on a linear
regression with E
time
of the first 10 seconds of data.
Type 3 records for measured columns are the mean values of all the data.
Type 4 records for measured columns are the ranges (max - min) of all the data.
Footer – the results of the analysis, including flux values. The footer won’t be
present for files logged with the “Compute Flux” option turned off.
Observation – the Header + n Raw Records + 3 Summary Records + the Footer.
The Summary Records consist of a number of Measured Variables, some of which
appear in all Observations, (i.e., Date, Pressure, CO
2
, H
2
O, etc.) and some of
which are optional, and a number of Final Variables of Type 2, 3, or 4, as shown
below. Summary statistics of Measured Variables are identified by the column
label, and a prefix of “IV”, “Mean”, or “Range”. Thus, for example, “IV Cdry”
means the Type 2 value of the Cdry column, and “Range Etime” means the Type 4
value of the Etime column.
The table below lists the LI-8100A variables, including the Label that appears in the
Header information, and a description of the variable. A summary of the method
and equations used to compute the Measured Variables, including the appropriate
slope of C
dry
, is given in Appendix D.
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