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| How do I grid directional data, such as wind speed and direction? |
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To grid directional data, follow these steps:
- Calculate the X and Y components of the speed/direction
data in the Surfer worksheet. See below for equations.
- Go to Grid | Data and grid these components separately (so you have two grid files, one for speed and another for direction).
- Go to Map | New | 2-Grid Vector Map, select the first grid and click Open, select the second grid and click Open.
The formulas for calculating the X
and Y components are:
X = r * sin(d2r(a))
Y = r * cos(d2r(a))
where
X = X component
Y = Y component
r = wind speed
a = wind direction (0° = north, 90° = east)
d2r converts degrees to radians for the worksheet sin
and cos functions.
See also: How do I create a vector map with magnitude and direction arrows at the data points?
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