wmline using multiple colors

I'd like to use wmline to draw a line connecting lat/lon points using a vector of colors. E.g.:

%%%%%%%%%%%%%%%%%%%%%%%%%

p = geopoint(lat,lon); hsv(:,1) = altitude/100; hsv(:,2) = 1; hsv(:,3) = 1;

rgb = hsv2rgb(hsv);

webmap

wmline(p, 'Color', rgb);

%%%%%%%%%%%%%%%%%%%%%%% In 2018a, I get this error:

Expected Color to be of size 1x3, but it is of size 5568x3.

What's up with this?

Stephen Blackstock

Answer 1

[Amy Haskins]

For the case of multiple lines with different colors, wmline expects each line to be a separate element of a geoshape vector. The code below would create a geoshape where each lat, lon segment is a separate line.

s = geoshape;
for ii = 1:(length(lat - 1))
  s(ii).Latitude = [lat(ii),lat(ii+1)];
  s(ii).Longitude = [lon(ii),lon(ii+1)];
  s(ii).Altitude = [alt(ii),alt(ii+1)];
end

As written above, you'll have one too many colors since there is one fewer line segments then there are points. The following line will plot your data using all but the last color.

 wmline(s,'Color',rgb(1:end-1,:))