How to plot all the points between two lines?

Question

Rakshit R 2019-4-6

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https://ww2.mathworks.cn/matlabcentral/answers/454806-how-to-plot-all-the-points-between-two-lines

评论： Rakshit R 2019-4-8

So, I have one line that goes from these lat lons :

lat10 = [6.6038,21.841667]; lon10 = [94.4166,62.375000];
plot(x10,y10,'-','color','y');%plotting the line
plot(x10-d,y10,'-','color','y');%plotting a line parallel to the above line

now I'm reading a set of cordinates from an excel sheet :

lat1 = xlsread('101010.xlsx', 'B2:B300');
lon1 = xlsread('101010.xlsx', 'C2:C300');

I want to only plot the points which are within these two lines.If any one point is not in between the lines, I don't want to plot anything. Please help me with how I can do this?

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Answer 1

A. Sawas 2019-4-6

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https://ww2.mathworks.cn/matlabcentral/answers/454806-how-to-plot-all-the-points-between-two-lines#answer_369341

编辑：A. Sawas 2019-4-6

在 MATLAB Online 中打开

It seems that you have an area inside a parallelogram defined by four points. Then you can use the inpolygon method as follows:

% find the X of the four points
X = [lat10(1),lat10(2),lat10(1)-d,lat10(2)-d];
Y = [lon10(1),lon10(2),lon10(1),lon10(2)];
% the X and Y of the other points which may or not be inside the parallelogram
lat1 = xlsread('101010.xlsx', 'B2:B300');
lon1 = xlsread('101010.xlsx', 'C2:C300');
[in,on] = inpolygon(lat1,lon1,X,Y);
% (in) contains the indices of the points inside the parallelogram
% (on) contains the indices of the points on the parallelogram
% do some plots
figure
plot(X,Y) % parallelogram
hold on;
plot(lat1(in),lon1(in),'r+') % points inside
plot(lat1(~in),lon1(~in),'bo') % points outside
hold off

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Rakshit R 2019-4-7

在 MATLAB Online 中打开

Okay My bad... I had to put the whole code so that it would become more clear.

This is what I'm doing..

Reading the data:

lat1 = xlsread('plot.xlsx', 'C2:C83400');
lon1 = xlsread('plot.xlsx', 'D2:D83400');
lat10 = [6.6038,21.841667]; lon10 = [94.4166,62.375000];

Renderind the data:

%% Render the recorded data
% Prepare figure
d=370400;
load   coords %#ok<*UNRCH>
close  all
opengl software % Hardware OpenGL rendering is unreliable for exporting images
figure('Renderer','opengl',...
       'DefaultTextFontName', 'Miryad Pro', ...
       'DefaultTextFontSize', 10,...
       'DefaultTextHorizontalAlignment', 'right')
% Settings
centerLoc = [12.9716,77.5946]; % LEVC
lineColor = [0.7,0.7,0.7];
vertiExag = 5; % vertical exaggeration
markSize  = 30;
maxRadius = 500e3; % bullseye max radius (m)
hold on
% Prepare UTM scenario
mstruct      = defaultm('utm');
mstruct.zone = utmzone(centerLoc(1),centerLoc(2));
mstruct      = defaultm(mstruct);
% Plot land contours
SHPdir    = '.\SHPs\';
countries = shaperead([SHPdir 'ne_10m_admin_0_countries.shp'],...
            'Selector',{@(x) strcmpi(x,'es'),'foo'},'UseGeoCoords', true);
% Change 'ES.VC' for the provinces/states of your preference or use a RegExp
% for all provinces: @(x) strcmpi(x,'ES.VC') => @(x) ~isempty(regexpi(x,'^ES.*$'))
provinces = shaperead([SHPdir 'ne_10m_admin_1_states_provinces.shp'],...
            'Selector',{@(x) strcmpi(x,'ES.VC'),'region_cod'},'UseGeoCoords', true);
[x,y]     = mfwdtran(mstruct,[countries.Lat provinces.Lat],[countries.Lon provinces.Lon]);
[xc,yc]   = mfwdtran(mstruct,centerLoc(1),centerLoc(2));
  [x1,y1]= mfwdtran(mstruct,lat1,lon1);
[x10, y10] = mfwdtran(mstruct,[lat10(1),lat10(2),lat10(1)-d,lat10(2)-d],[lon10(1),lon10(2),lon10(1),lon10(2)]);

Plotting:

% Plot bullseye
t = linspace(0,2*pi);
for i = 0:50e3:maxRadius
    plot(xc+i.*cos(t),yc+i.*sin(t),'-','color',lineColor)
    if i>0
        text(xc+i-15e3, yc-15e3, [num2str(i/1e3) 'km'],'color',lineColor,'HorizontalAlignment','center');
    end
end
% Plot lines
plot([xc xc],[yc-i-10e3 yc+i+10e3],'-','color',lineColor)
plot([xc-i-10e3 xc+i+10e3],[yc yc],'-','color',lineColor)
 plot(x10,y10,'-','color','y');%plotting ats
 plot(x10-d,y10,'-','color','y');%only for first batch
hold on ; 

A. Sawas 2019-4-8

在 MATLAB Online 中打开

Using the details you provided try this code:

X = [x10,fliplr(x10)-d];
Y = [y10,fliplr(y10)];
[in,on] = inpolygon(x1,y1,X,Y);
% (in) contains the indices of the points inside the parallelogram
% (on) contains the indices of the points on the parallelogram
% do some plots
%plot(X,Y) % parallelogram
plot(x1(in),y1(in),'r+') % points inside
plot(x1(~in),y1(~in),'bo') % points outside

Rakshit R 2019-4-8

This worked!!

Thanks a lot Sawas. :')

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