How Do I plot Lat Long Altitude into a 2D countour

It doesnt seem to work since I have a negative cordinate

[Bjorn Gustavsson]

So you edit the question after I've tried to give you a working solution, did the solution work?

Answer 1

[Bjorn Gustavsson]

The problem you have is that you have coordinates for contours one level at a time, however since you have multiple closed loops this solution looks silly:

load LATLONALT.dat
levels = unique(LATLONALT(:,3)); % 5 levels...
for iLevels = 1:numel(levels)
  plot(LATLONALT(LATLONALT(:,3)==levels(iLevels),1),...
       LATLONALT(LATLONALT(:,3)==levels(iLevels),2),'-')
  hold on
end

However, if you put in rows with nan inbetween the different closed contour-level-loops this should work.

HTH