How to know the real distance between nodes (in meters) ?

[Catrina Ivanova]

hello, 

I know how to get the position of the nodes coordinates (x, y, z) and how to calculate the distance between two nodes with this formula  : d=√((x_2-x_1)²+(y_2-y_1)²)

But is the distance found in in meters centimeters ? 

thank you

[john kujk]

meters

[Catrina Ivanova]

thank you

[Ali H. Wheeb]

hi

I also use ns3 to simulate ad hoc networks and FANET. so, kindly, explain how you know the node's position?  and the distance between two nodes

for example node 1 and node 2?

best regards

[Catrina Ivanova]

you can get the node position from the Mobility model like ths : 

Ptr<Node> node = m_ipv4->GetObject<Node> ();
Ptr<MobilityModel> mob = node->GetObject<MobilityModel>();
uint16_t x = mob->GetPosition().x;
uint16_t y = mob->GetPosition().y;

uint16_t z = mob->GetPosition().z;

[Ali H. Wheeb]

Thanks for responding 

And how to know the distance between two nodes

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[Tom Henderson]

On 6/27/22 06:12, Ali H. Wheeb wrote:
> Thanks for responding
>
> And how to know the distance between two nodes
>

See the MobilityModel::GetDistanceFrom () method.

[Ali H. Wheeb]

is there an example video or tutorial to understand

MobilityModel::GetDistanceFrom () method.

[Geovany Teca]

Hi, 

Here is the API:

double

MobilityModel::GetDistanceFrom (Ptr<const MobilityModel> other) const

I am not sure if it is gonna work, but it is worth trying and you can improve, but here is a good starting point:

#include "mobility-model.h"

NodeContainer nodes ;

nodes.Create(2);

NodeContainer::Iterator firstNode = nodes.Begin();

Ptr<Node> NodePtr = *firstNode;

Ptr<MobilityModel> position = NodePtr->GetObject<MobilityModel> ();

double distance = GetDistanceFrom (position); /* print distance here */

This is just to give you an idea how you can call the method, try to adapt to your code.

Regards

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