Why does the CONTOURM function in the Mapping Toolbox draw stray lines at some contour levels?

I use CONTOURM to draw contours when specifying a vector of levels. However, at one of these levels, I see stray lines that seem to be connecting points across my entire map. It appears as though CONTOURM is not distinguishing the situation when my contour intersects the line of longitude at the edge of my map. Instead, it tries to connect the data points through that line of longitude, and across the map.

Answer 1

[MathWorks Support Team]

This bug has been fixed for Release 14 SP1 (R14SP1). For previous releases, please read below for any possible workarounds:

This has been verified as a bug in the Mapping Toolbox in the way that the mapping contour functions determine where the edge of the map is.

Currently, to work around this issue, you can try off-setting your contours by a small amount. For example, if you are using a contour level vector of [2000:50:5000], you can change it to something like [2000:50:5000] +10. Keep trying different increments until you find one that works.

[Image Analyst]

Did you see in the answer where it said " For previous releases, please read below for any possible workarounds :"???