RCRV Datapresence and Engineering Support Center
Oregon State University
Corvallis, OR 97331, USA
coriolix_support@oregonstate.edu
Oregon State University
Corvallis, OR 97331, USA
coriolix_support@oregonstate.edu
High resolution data are stored and available only for a short term. The number of days to store can be configured from 10 days or more (90 days is recommended) on the Data/Access/Archive page.
Data are binned using an (unweighted) mean over a set time interval.
Statistics are also captured (std, min, max, num, spotval, median) and made available to the end-user.
Circular data (such as heading or wind direction) are averaged using circular mean and circular standard deviation calculations.
For example, the circular average of 355 and 5 is 0 not 180.
Vector data (such as true winds) are averaged using vector averaging.
First, the components (u,v,w) are each averaged using a simple mean.
These mean components are then used to derive the mean direction and mean magnitude:
mean_direction = rad2deg(atan2(mean_u, mean_v)) + 180
mean_magnitude = sqrt(mean_u^2 + mean_v^2)
All parameters are binned by default to 1-minute bins, centered on "nice" minute timestamps (12:03:00, 12:04:00, etc). On request prior to a cruise, binned data at a different (custom) time interval may also be generated for that cruise. The default for the custom bin interval is 10 minutes. Data collected less frequently than every minute (e.g. ceilometer data are collected every six minutes) are populated with NaNs between data points. The timestamp provided with each bin is the center time of the bin.
Binned data are stored and available only for a short term. The number of days to store can be configured from 10 days or more (90 days is recommended) on the Data/Access/Archive page.
Bins are derived only from data that have flag values of 0, 1, or 2 (i.e. no suspect or failed data). For example, if there are 10 data points within the binning time interval, and one of them has a flag set to "fail", only the remaining 9 data points are used to calculate the bin value.
Quality flags representing the binned data are a composite of all of the flags from that bin.
For each flag position, the largest value is used in the composite binned flag.
For example:
Individual Data Flags
111144000022222222111100000000
121122000033222222114400000000
Composite Flag
121144000033222222114400000000
Every downloaded binned data file contains the following columns:
time: the center timestamp of the bin
spot_time: the timestamp of the spot value
spot_value: data value collected closest in time to the center time of the bin
num_values: the number of values in the bin
When relevant, binned data files will also contain these additional columns:
mean: the unweighted mean (see above for circular and vector means)
stddev: the standard deviation
minimum: the minimum value in the bin
maximum: the maximum value in the bin
median: the median value in the bin
Note that for some data types (e.g. text), a spot value is a more relevant metric than the mean.
Binned data may be represented by either spot values or unweighted means over a set time interval.
Text, geographic point, and datetime data are represented by spot values.
Circular data (such as heading or wind direction) are averaged using circular mean and circular standard deviation calculations.
For example, the circular average of 355 and 5 is 0 not 180.
Vector data (such as true winds) are averaged using vector averaging.
First, the components (u,v,w) are each averaged using a simple mean.
These mean components are then used to derive the mean direction and mean magnitude:
mean_direction = rad2deg(atan2(mean_u, mean_v)) + 180
mean_magnitude = sqrt(mean_u^2 + mean_v^2)
All other numeric data (floats, integers) are calculated using unweighted means.
All parameters are binned by default to 1-minute bins, centered on "nice" minute timestamps (12:03:00, 12:04:00, etc). On request prior to a cruise, binned data at a different (custom) time interval may also be generated for that cruise. The default for the custom bin interval is 10 minutes. Data collected less frequently than every minute (e.g. ceilometer data are collected every six minutes) are populated with NaNs between data points. The timestamp provided with each bin is the center time of the bin.
Binned data are stored and available only for a short term. The number of days to store can be configured from 10 days or more (90 days is recommended) on the Data/Access/Archive page.
Bins are derived only from data that have flag values of 0, 1, or 2 (i.e. no suspect or failed data). For example, if there are 10 data points within the binning time interval, and one of them has a flag set to "fail", only the remaining 9 data points are used to calculate the bin value.
Every downloaded binned data file contains the following columns by default:
time: the center timestamp of the bin
latitude: the latitude closest in time to the bin center timestamp (a spot value)
longitude: the longitude closest in time to the bin center timestamp (a spot value)
point: the geo point derived from the lat/lon values
In addition, the file may contain multiple additional parameters on request (one column per parameter).
Each parameter column contains either the mean or spot value (as appropriate) for that parameter.