|dlfn| datasets also contain shortcuts to other variables that can be obtained from simple operations of its data items. Certain shortcuts require variables calculated using the :ref:`DOLfYN API <package>`.
Important Note: The items listed in Table 4 are not stored in the dataset but are provided as attributes (shortcuts) to the dataset itself. They are accessed through the xarray accessor velds.
For example, to return the magnitude of the horizontal velocity:
>> import dolfyn as dlfn
>> dat = dlfn.read_example('AWAC_test01.wpr')
>> dat.velds.U_mag
<xarray.DataArray 'vel' (range: 20, time: 9997)>
array([[1.12594587, 0.82454599, 0.96503734, ..., 3.40359042, 3.34527587,
3.44412805],
[0.86688534, 1.05108722, 1.12899632, ..., 0.72053462, 6.47548786,
0.49120468],
[0.88066635, 0.97954744, 0.63123135, ..., 4.37153751, 2.77540426,
1.81550287],
...,
[1.00013206, 1.21381814, 1.14834231, ..., 5.89236205, 1.44082763,
2.7157082 ],
[0.7759962 , 0.89600228, 1.02900833, ..., 2.39949021, 2.18758737,
4.41797285],
[0.95729835, 1.15594339, 1.15038508, ..., 3.11517746, 3.79158362,
2.66788512]])
Coordinates:
* range (range) float32 1.41 2.41 3.4 4.4 5.4 ... 17.36 18.36 19.35 20.35
* time (time) float64 1.34e+09 1.34e+09 1.34e+09 ... 1.34e+09 1.34e+09
Attributes:
units: m/s
description: horizontal velocity magnitude