# How to plot pixels on the figure when I have coordinates of the center of each pixel

77 views (last 30 days)
BN on 5 May 2020
Commented: Ameer Hamza on 7 May 2020
Hello,
I have the coordinates of the center of 93 0.5x0.5 pixels.
I want to plot them like this picture: Here is my data which contains latitude, longitude, and also value.
Any suggestion or advice is highly appreciated.

Ameer Hamza on 5 May 2020
Edited: Ameer Hamza on 5 May 2020
Try scatteredInterpolant()
x = points{:,1};
y = points{:,2};
z = points{:,3};
interp_model = scatteredInterpolant(x, y, z);
xg = linspace(min(x), max(x), 100);
yg = linspace(min(y), max(y), 100);
[Xg, Yg] = meshgrid(xg, yg);
Zg = interp_model(Xg, Yg);
pcolor(Xg, Yg, Zg) after pcolor() to get a smooth surface Ameer Hamza on 7 May 2020
Yes, It is possible, but that will make the points in some figures to be very similar. For example, If you set the limits of the color axis from 0 to 400 for all figures, then if the points lie between [127 130], they will have a very similar color. Try following code. I set the limits of color axis as [0 400]
%%
mapshow(s)
hold on
axis equal
ax = gca;
xL = ax.XLim;
yL = ax.YLim;
%%
rect_x = [-0.25 -0.25 0.25 0.25];
rect_y = [0.25 -0.25 -0.25 0.25];
x = points{:,1};
y = points{:,2};
z = points{:,3};
num_colors = 200;
clrs = summer(num_colors);
zlim = [0 400];
clr_val = @(z) clrs(ceil(interp1(zlim, [0 1], z)*num_colors), :);
for i=1:numel(x)
p(i) = patch(rect_x + x(i), rect_y + y(i), ...
clr_val(z(i)), ...
'EdgeColor', 'none');
end
ax.XLim = xL;
ax.YLim = yL;
colorbar
colormap(summer)
caxis(zlim)

R2020a

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