[Solved] What is better way represent a spatial data

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I’m assuming your grids are all exactly the same size, and are arranged in a perfect rectangle, as indicated by your image. How about storing all grids in a simple 2D array? You can then find the index of any grid by doing

grid_size = 30; 
index_x = math.floor(user.x/grid_size); 
index_y = math.floor(user.y/grid_size);

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solved What is better way represent a spatial data