How can I extract the data (values) which are comming under the line

Hello, I have values of NO2 with its latitude & longitude, I plotted that in matlab, Now I want to extract perticular NO2 values say those NO2 values which comes under a perticular line. I have potted the line on the previous map (NO2, lat, lon) as shon in the figure. So please help me in extracting the perticular NO2 data(values) which comes under this line. I used the following code to plot the map with line.

Thankyou

figure
map = pcolor(lon1,lat1,no2);
map.EdgeAlpha = 0
colormap('jet')
colorbar();
hold on
j = [76.5,77.669];
k = [29.1,28.36];
pl = line(j,k);
pl.Color = 'red';
hold off

Answer 1

[Takumi]

How about interpolation?

clear
close all
clc

[X,Y,Z] = peaks(50);    % sample

figure
map = pcolor(X,Y,Z);
map.EdgeAlpha = 0
colormap('jet')
colorbar();
hold on
j = [-1,1];
k = [1,-1];
pl = line(j,k);
pl.Color = 'red';
hold off

xq = linspace(-1,1,100);
yq = linspace(1,-1,100);
F = griddedInterpolant(X',Y',Z');
vq = F(xq,yq);

Answer 2

[Image Analyst]

Convert it to a digital image and then use improfile