Make lines thinner than the 0.5 setting in R2015b

I'm hoping that this might have a simple solution.. I'm plotting a series of polygon line segments using the Mapping Toolbox command geoshow and need them to be very thin (less than 0.5) as there are thousands of individual segments. Currently, the plotting code is:

geoshow(lats,lons,'LineWidth',0.1,'Color','red');

but, upon inspection afterwards, it only plots lines that are actually of LineWidth 0.5. A sample plot of a single year is attached, but keep in mind that there will be an additional 32 years of data being plotted at the same time. Any suggestions?

[Walter Roberson]

The attachment did not make it.

Related: http://www.mathworks.com/matlabcentral/answers/296541-line-thickness-issue-linewidth-acts-as-an-integer

[dpb]

See recent similar question...the issue is likely one what the actual resolution can be give pixel spacing. <Line Width>

Answer 1

[Leone Campos]

I was able to "simulate" a thinner LineWidth behavior using transparency (alpha). You may have problems with rendering, since it forces using opengl render, but you can give it a try.

From https://www.mathworks.com/help/map/ref/geoshow.html#btvl8r5-2:

Original:

coast = shaperead('landareas.shp','UseGeoCoords',true,'RecordNumbers',2);
coast.Geometry
worldmap([-45 80],[-25 195]);
geoshow(coast)

Smaller LineWidth doesn't change anything:

coast = shaperead('landareas.shp','UseGeoCoords',true,'RecordNumbers',2);
coast.Geometry
worldmap([-45 80],[-25 195]);
geoshow(coast,'LineWidth',0.1) % <<---- Modified line

With EdgeAlpha:

coast = shaperead('landareas.shp','UseGeoCoords',true,'RecordNumbers',2);
coast.Geometry
worldmap([-45 80],[-25 195]);
geoshow(coast,'EdgeAlpha',0.5) % <<---- Modified line

Even thinner:

coast = shaperead('landareas.shp','UseGeoCoords',true,'RecordNumbers',2);
coast.Geometry
worldmap([-45 80],[-25 195]);
geoshow(coast,'EdgeAlpha',0.25) % <<---- Modified line

[dpb]

Maybe it's just a fignewton of display, but to me the land mass also looks somewhat washed out in the latter as compared to the first.

Or, maybe it's an optical delusion owing to the reduced contrast of the outline...