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Add coordinate points to a grid

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Vanessa
Vanessa on 25 Jul 2015
Commented: Vanessa on 26 Jul 2015
Hi, I need help. Im trying to create a grid (map of a ground) 200m x 300m and then I need to add some points in the grid. I have the coordinates of the points, but I dont know how to do it. I did the grid with the command [X,Y]= meshgrid() but it created a grid with lines, not an empty grid. So, I need an empty grid in which I can add the points. Thanks so much, Vanessa
  2 Comments
Walter Roberson
Walter Roberson on 25 Jul 2015
Are you wanting to use the mapping toolbox?
Vanessa
Vanessa on 26 Jul 2015
I think is not necessary, just a grid in which I could add points (trees) and then evaluate how many of these points are around (e.g. radius of 5 meters) to a specific point.

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Accepted Answer

Image Analyst
Image Analyst on 26 Jul 2015
Why can't you just do
% Create empty grid. No lines at all, or any points at all.
myGrid = zeros(rows, columns);
% You say you have existing coordinates already.
% Let's assume they are in arrays called x and y
% and have values that correspond to rows and columns.
% Place them in the grid with a value of 1
for k = 1 : length(x)
myGrid(y(k), x(k)) = 1;
end
  2 Comments
Image Analyst
Image Analyst on 26 Jul 2015
To find out which are within a distance of 5 from some other point (x0, y0):
distances = sqrt((x-x0).^2 + (y-y0).^2);
% Get a logical index array of those elements within 5
within5 = distances < 5;
% Now "evaluate how many of these points are around
% (e.g. radius of 5 meters) to a specific point."
howMany = sum(within5);
I think this should get you what you asked for.
Vanessa
Vanessa on 26 Jul 2015
Thanks so much :)

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