Plotting multiple trajectories on map

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C G
C G on 24 Jul 2018
Commented: C G on 25 Jul 2018
I have a rather strange one.
I need to plot multiple trajectories on a map. Right now, I am manually adding each latitude and longitude to the script and plotting away. This is easy enough for a few lines, but not in the long run.
The variables tdump* are specific to a trajectory and are from individually named text files. So... these change depending on the text file. What I have been doing is importing the information I need from each text file and assigning it a numeric variable with the same name.
%Import data from file. Get rid of ugly header.
filename = 'tdump85072712.txt';
delimiterIn = ' ';
headerlinesIn = 12;
C = importdata(filename,delimiterIn,headerlinesIn);
%To assign certain columns to a specific variable
tdump85072712 = C.data(:,9:12);
I then go on to plot each onto a map.
figure
lima ('xy') %Plots a stereographic map
plotps(tdump85072506(:,2),tdump85072506(:,3),'r-')
plotps(tdump85072512(:,2),tdump85072512(:,3),'color', [0 .498 0],'linestyle','-')
plotps(tdump85072518(:,2),tdump85072518(:,3),'k-')
plotps(tdump85072600(:,2),tdump85072600(:,3),'color', [.306 .396 .58],'linestyle','-')
plotps(tdump85072606(:,2),tdump85072606(:,3),'m-')
plotps(tdump85072612(:,2),tdump85072612(:,3),'b-')
plotps(tdump85072618(:,2),tdump85072618(:,3),'y-')
...
Does anyone know of an easier way to achieve the same thing?
  4 Comments
C G
C G on 24 Jul 2018
Oh, I didn't mean to offend. I figured I would get some mocking for being a newbee at matlab coding. I am grateful for any help I can get that will make my life easier when making all of these maps.

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Accepted Answer

Pawel Jastrzebski
Pawel Jastrzebski on 24 Jul 2018
This is roughly how I would go about this problem [code untested]:
% Get all the file names in the folder
filename = dir('*.xlsx');
% Import settings
delimiterIn = ' ';
headerlinesIn = 12;
% empty Table that will hold ALL imported data
tData = []
% Use 'for loop' to import alle the data into one place
for i = 1:numel(filename)
C = importdata(filename,delimiterIn,headerlinesIn);
% add data to a table - 4 columns
tData = [tData C.data(:,9:12)]
end
% plot first set of data
figure
plotps(tData.(2),tData(3))
hold on
% add rest of the plots to the figure
% using 'for' loop
% starting from 2nd set of data
for j = 6:4:size(tData,2)
plotps(tData.(j),tData(j+1));
end
Side note, it's interesting to see that you import 4 columns out each file (columns 9:12) and yet use only column 2:3 from each data set for plotting. Are you using the remaining data for something else? If not just don't import it.
  6 Comments
C G
C G on 25 Jul 2018
Thank you! I am now on my way to creating lots and lots of maps for my thesis.

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More Answers (1)

C G
C G on 25 Jul 2018
Edited: C G on 25 Jul 2018
After a few minutes of tinkering, I got this to work. Please let me know what you think. Still having trouble with the import step, so this was done manually.
%Step 1: Import your file names as a string. This step was done manually.
%Gets rid of the ugly header.
delimiterIn = ' ';
headerlinesIn = 12;
%Create an empty Table that will hold ALL imported data
tData = [];
% Use 'for loop' to import all of the data into one place
for i = 1:100
%Set this to the number of files you want to import. tdumpnamesS2 is my string name
C = importdata(tdumpnamesS2(i),delimiterIn,headerlinesIn);
%add data to a table - 4 columns
tData = [tData C.data(:,9:12)];
end
%plot first set of data
figure
lima('xy') %Plots a stereographic LIMA image of AA, full continent.
plotps(-71.166889,111.366531,'color', [.6 .2 1],'linestyle','none','marker','p','markersize',05, 'markerface',[.6 .2 1])
%The line above marks the end point for all of the trajectories.
plotps(tData(:,2),tData(:,3),'r-'); %Turns the first line red.
hold on;
%add rest of the plots to the figure using 'for' loop
%starting from 2nd set of data
for j = 6:4:size(tData,2)
plotps(tData(:,j),tData(:,j+1));
end

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