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Archival (short interval) data files Archival files contain processed and edited data. The file format is tab-separated ASCII, so data may easily be imported into a spreadsheet program. Currently, these short interval files are in month blocks, with the data from the first time interval in the month occurring on the first (non-header) data line. Time intervals are consistent within a given file. Intervals occurring in our archival data files are: five, ten, fifteen, or sixty minutes long. The
first line is a header that contains the monitoring
station ID code, the year in which the data were obtained, and a series
of element numbers that describe the
data in each column. Since each data value is followed by a data
quality flag, element numbers are followed by a zero, which acts as
a placeholder so element numbers line up with appropriate data columns.
Data begins on the second line. The first number
is the day of the year. For example, January 1 is year-day 1, while February 1 is
year-day 32.
The next column indicates the ending time of the
measurement in military time format. For example, 105 would be 1:05 a.m. and 1535 would
be 3:35 p.m. Data values on a given line are understood to "occur" during the interval
extending from the ending time on the previous line to the ending time on the line
in which they are listed. Please note only local standard time is used—never
daylight savings time. Following
the year-day and time is a data value for the first element number. Then,
immediately following this is a quality
control flag. The pattern of data value followed by data quality flag
continues across the line until all element numbers are represented by value/flag
pairs. Note that data values are interpreted in accordance with the element
numbers below which they are listed. As a result, some data values may be
averages over the time interval in which they occur, but others may be totals
over the same interval.Example
94169 1997 1000 0 2010 0 1002 0
1 100 0 12 0 12 0 12
1 200 0 12 0 12 0 12
1 300 0 12 0 12 0 12
1 400 0 12 0 12 0 12
1 500 0 12 0 12 0 12
1 600 0 12 0 12 0 12
1 700 0 12 0 12 0 12
1 800 1 12 0 12 2 12
1 900 31 12 0 12 30 12
1 1000 79 12 1 12 73 12
1 1100 125 12 0 12 120 12
1 1200 132 12 1 12 125 12This example is from HEHR9701.txt. The first line gives the location ("94169" is Hermiston), the year ("1997"), and the element numbers: "1000" is global irradiance, "2010" is direct normal or beam irradiance, and "1002" is a second instrument measuring global irradiance.
The first data line provides the year-day ("1"
is January 1), time of day ("100" is 1:00 a.m.), and an alternating sequence of
data values and flags. The first data value is the global irradiance: 0
watt hours
per square meter per hour, and its associated flag is "12", which stands for
processed data. Next is the direct normal irradiance value followed
by its flag, and then the second global value and its flag. The file contains
hourly data for all 31 days of the month. © 2000, UO Solar Radiation Monitoring Laboratory. Last
revised: January 23, 2001.
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