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how to plot contours in matlab

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Muhammad Usman  Saleem
Muhammad Usman Saleem on 7 Jun 2016
Answered: KSSV on 8 Jun 2016
I would like to make contours of elevations. My text file which contain lat, lon and elevation data set. I want to genterate contours of this elevation data set.on this help vedio and documentations i able to prepare this code as starting
a=load('2002dec.txt');
>> x=a(:,1);
y=a(:,2);
>> z=a(:,3);
>> [x,y]=meshgrid(60:0.5:78,21:0.5:38);
>> contour(x,y,z)
But getting error.
I also want to set a shape file as back ground of these contours.Any guide line will be highly appriciable.
My text file data and shape file has been attached with this post

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Accepted Answer

KSSV
KSSV on 7 Jun 2016
Edited: KSSV on 7 Jun 2016
shapefile = 'PAK_adm1.shp' ;
S = shaperead(shapefile) ;
data = importdata('2002dec.txt') ;
x = data(:,1) ; x = unique(x) ;
y = data(:,2) ; y = unique(y) ;
z = data(:,3) ;
[X,Y] = meshgrid(x,y) ;
Z = reshape(z,size(X)) ;
pcolor(Y,X,Z) ; shading interp ;
hold on
for i = 1:length(S)
plot(S(i).X,S(i).Y,'k') ;

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Muhammad Usman  Saleem
Muhammad Usman Saleem on 7 Jun 2016
Dear @Dr. Siva Srinivas Kolukula , what this code is doing? It is only producing color image consist on grids. Please tell me what kind of map it is? Whether these are another view to show contours?
Tell me please whether it is DEM?
KSSV
KSSV on 7 Jun 2016
I mentioned already....use contour(Y,X,Z)....you will get the contours...

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More Answers (2)

KSSV
KSSV on 7 Jun 2016
You may use contour(Y,X,Z) for plotting contour....

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KSSV
KSSV on 8 Jun 2016
Try using freezeColors after hold on..... You may get the funciton from the link: http://in.mathworks.com/matlabcentral/fileexchange/7943-freezecolors---unfreezecolors

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