The Vector Field function is used to composite and convert two rasters into a two-band raster that is of either data type Magnitude-Direction or data type U-V.
If the Input Data Type parameter is Magnitude-Direction, you also need to specify the Angular Reference System. parameter.
The U value is sometimes referred to as the zonal velocity or velocity along latitudinal lines. The V value is sometimes referred to as the meridional velocity or velocity along longitudinal lines.
Conversion between U-V and Magnitude-Direction
The two subsections below contain the formulas for the appropriate conversions. The variables are as follows:
- u = vector-U
- v = vector-V
- m = magnitude
- d = direction
Magnitude-Direction to U-V
u = m * cos (pi *d / 180)
v = m * sin (pi * d /180)
U-V to Magnitude-Direction
m = sqrt (u * u + v * v)
d = atan2 (v / u) * 180 / p
The first input raster.
This will be either the U value or the magnitude.
The second input raster.
This will be either the V value or the direction.
|Input Data Type
The type of vector field your inputs represent.
|Angular Reference System
Specifies how the direction component was measured.
|Output Data Type
Specifies the type of vector field your output will represent.