Available with Image Server
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.
Notes
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
Parameters
Parameter | Description |
---|---|
Raster1 | The first input raster. This will be either the U value or the magnitude. |
Raster2 | 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.
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