Tracking Agent Space Occupancy on Grid

[Quentin Devalloir]

Dear all,

I'm currently working on an individual-based model (IBM) in GAMA where I aim to compare how agents occupy space over time using a grid. My goal is to create a grid where each cell starts at zero and increments by +1 every time an agent passes through or occupies that cell.

So far, I’ve tried two different approaches without success:

1. The example from the GAMA wiki on Movement on a Grid of Cells, but since my agents use a wander behavior, the return_path function isn’t compatible or doesn't work as expected in this case.

2. The generate_pedestrian_paths example, to get a .shp of space occupancy but  it doesn’t seem to suit my need for tracking free-form trajectories of wandering agents.

Do you have any suggestions, or know of other examples or strategies that could help me implement this type of space occupancy tracking?

Thanks in advance for your help!

Best regards,
Quentin

[Benoit Gaudou]

Dear,

You can simply make your agents move and update an attribute of the cell overlapping (cf. this GAML operator) it.

If you want your agent can jump from one cell to another one (that are not neighbors), and want to update all the cell on the path, 

you can simply create a line geometry (line operator) (from the previous location to the new one), and update all the cells overlapping that line.

Best regards

Benoit

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[Quentin Devalloir]

Dear Benoit, 

Thank you very much for your answer, I managed to add a "path" attribute of my agent with : 

my_grid Ag_path <- one_of(my_species overlapping(self.location));

However, I fail to get a shapefile containing my agent path attribute with 'save' . Here is what I did:

save my_grid to: "my_grid_move05.csv" format: "csv" ;

and

save my_grid to: "my_grid_move05.csv" format: "csv" attributes:: [name, Ag_path];

Do you know how can I fix the attribute in the .dbf file please ? 

Many thanks in advance

Best regards

Quentin 

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[Benoit Gaudou]

Dear,

Here you are saving your agents as a CSV file, which does not contain the geometry.

You should save it as a shapefile (see the dedicated model in the model library).

Benoit

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[Quentin Devalloir]

Hello, 

Indeed...  It works better with : 

save my_grid to: "my_grid.shp" format: "shp"

Sorry for this nooby mistake.

Now it's fixed, thanks a lot ! 

Have a good day