> ## Documentation Index
> Fetch the complete documentation index at: https://docs.resq.software/llms.txt
> Use this file to discover all available pages before exploring further.

# ResQ.Core.Velocity.Velocity(double,double,double)

### [ResQ.Core](./ResQ.Core.md "ResQ.Core").[Velocity](./ResQ.Core.Velocity.md "ResQ.Core.Velocity")

## Velocity(double, double, double) Constructor

Represents a velocity vector in NED (North-East-Down) coordinate frame.

```csharp theme={null}
public Velocity(double Vx, double Vy, double Vz);
```

#### Parameters

<a name="ResQ.Core.Velocity.Velocity(double,double,double).Vx" />

`Vx` [System.Double](https://learn.microsoft.com/en-us/dotnet/api/system.double "System.Double")

Velocity in North direction (m/s). Positive is North, negative is South.

<a name="ResQ.Core.Velocity.Velocity(double,double,double).Vy" />

`Vy` [System.Double](https://learn.microsoft.com/en-us/dotnet/api/system.double "System.Double")

Velocity in East direction (m/s). Positive is East, negative is West.

<a name="ResQ.Core.Velocity.Velocity(double,double,double).Vz" />

`Vz` [System.Double](https://learn.microsoft.com/en-us/dotnet/api/system.double "System.Double")

Velocity in Down direction (m/s). Positive is Down, negative is Up.

### Example

```csharp theme={null}
// Drone moving North at 10 m/s, East at 5 m/s, and climbing at 2 m/s
var velocity = new Velocity(10.0, 5.0, -2.0);

// Calculate ground speed (ignoring altitude change)
double groundSpeed = Math.Sqrt(velocity.Vx * velocity.Vx + velocity.Vy * velocity.Vy);
```

### Remarks

The NED frame is a local tangent plane coordinate system commonly used in aviation
and robotics. Positive X is North, positive Y is East, and positive Z is Down.