[Scilab-users] {EXT} Re: need a little help

[Dang Ngoc Chan, Christophe]

Hello,

> De : users [mailto:users-bounces at lists.scilab.org] De la part de P M
> Envoyé : lundi 18 février 2019 18:09
>
> Actually my goal was to compare point coordinates to map coordinates
> and find the points on the map which are closest to the given point coordinates.
> [...]
> The points are building a line on the map

I'm not sure I understand your problem well but:

If you want to find the points of the maps that are close to a line, You might considere the Cartesian equation of the line

f(x, y) = 0 with f(x, y) = ax + by + c

and search for the points of the map which abs(f(x, y)) value is low.

From what I understand about your statement, you have a set of points = [ lineX, lineY] ; you  might extract the (a, b, c) parameters of the line by linear regression, something like

X = [x ; ones(x)];

A = y\X;

(if the line is not vertical) then look at abs(A(1)*x - y + A(2)) < threshold or something like that.

Otherwise, if you want to detect a line in a map, you might have a look at the Hough transform.

Regards

--
Christophe Dang Ngoc Chan
Mechanical calculation engineer

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