adjacent (integer, required)
An ID for an adjacent vegetation unit.

id (integer, required)
A vegetation unit ID.

position (character)
Deprecated. The position of the adjacent vegetation unit relative to this unit. Valid values are A (above), B (below), N (next to), and E (use elevation). The default value is N.

slope (double)
The rate of change in elevation (rise / run) from the unit to the adjacency. A terrain without any change in elevation has zero slope. The default value is zero.

spread (double)
Degrees azimuth between the adjacent units. The default value is zero.

wind (character)
Deprecated. The position of the adjacent vegetation unit with respect to the wind. Valid values are D (down wind) and N (no wind). The default value is N.

windDirection (double)
The direction that the wind originates. A wind blowing from west to eash has a direction of 270°. A wind blowing from north to south has a direction of 0°. The default value is zero.

windSpeed (double)
The wind speed in meters per second across the adjacent unit. The default value is zero.