Make lines thinner than the 0.5 setting in R2015b

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Norman Shippee
Norman Shippee 2016-7-22
编辑： dpb 2021-8-11
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?

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回答（1 个）

Leone Campos
Leone Campos 2021-8-10
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)
Original
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
LineWidth=0.1
With EdgeAlpha:
coast = shaperead('landareas.shp','UseGeoCoords',true,'RecordNumbers',2);
coast.Geometry
worldmap([-45 80],[-25 195]);
geoshow(coast,'EdgeAlpha',0.5) % <<---- Modified line
EdgeAlpha=0.5
Even thinner:
coast = shaperead('landareas.shp','UseGeoCoords',true,'RecordNumbers',2);
coast.Geometry
worldmap([-45 80],[-25 195]);
geoshow(coast,'EdgeAlpha',0.25) % <<---- Modified line
EdgeAlpha=0.25
  1 个评论
dpb
dpb 2021-8-11
编辑：dpb 2021-8-11
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...

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