MATLAB: How to enable Matlab maps to show longitude and latitude labels

mlabellocation

Below is my code for drawing a map. The problem is that it does not show the longitude and latitude labels,e.g., 20oE, 30oE, etc. How do I enable it?

landareas = shaperead('landareas.shp','UseGeoCoords',true);
ax=axesm ('robinson', 'Frame', 'on', 'Grid', 'on', 'Origin', [0, 180, 0]);
geoshow(landareas,'FaceColor',[0.85 0.85 0.85],'EdgeColor', 'none');

I tried the below and it did not work.

setm(ax,'mlabellocation',20,'plabellocation',10);

Thank you.

Best Answer

You need to set the label properties to on:

setm(ax, 'meridianlabel', 'on', 'parallellabel', 'on')

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MATLAB: Issue creating a map of the USA

You can see an example here.

figure
ax = usamap('all');
set(ax, 'Visible', 'off')
states = shaperead('usastatelo', 'UseGeoCoords', true);
names = {states.Name};
indexHawaii = strcmp('Hawaii',names);
indexAlaska = strcmp('Alaska',names);
indexConus = 1:numel(states);
indexConus(indexHawaii|indexAlaska) = []; 
stateColor = [0.5 1 0.5];

Display the three regions.

geoshow(ax(1), states(indexConus),  'FaceColor', stateColor)
geoshow(ax(2), states(indexAlaska), 'FaceColor', stateColor)
geoshow(ax(3), states(indexHawaii), 'FaceColor', stateColor)

Hide the frame.

for k = 1:3
    setm(ax(k), 'Frame', 'off', 'Grid', 'off',...
      'ParallelLabel', 'off', 'MeridianLabel', 'off')
end

Add labels to each state.

lat = [states(indexConus).LabelLat];
lon = [states(indexConus).LabelLon];
textm(lat, lon, {states(indexConus).Name},'HorizontalAlignment', 'center','Parent',ax(1));
latA = [states(indexAlaska).LabelLat];
lonA = [states(indexAlaska).LabelLon];
textm(latA, lonA, {states(indexAlaska).Name},'HorizontalAlignment', 'center','Parent',ax(2));
latH = [states(indexHawaii).LabelLat];
lonH = [states(indexHawaii).LabelLon];
textm(latH, lonH, {states(indexHawaii).Name},'HorizontalAlignment', 'center','Parent',ax(3));

MATLAB: How to set usamap projection to mercator

Hello Leon,

Once you use geoshow to place shapes onto the map, you cannot change the map projection. You could delete all the children, change the projection, and then reuse geoshow. But an easier way is to just set the map projection at the outset:

ax = usamap([10 90], [-180 -50] );
states = geoshape(shaperead('usastatehi', 'UseGeoCoords', true));
oceanColor = [.5 .7 .9];
setm(ax, 'FFaceColor', oceanColor)
setm(ax,'MapProjection','mercator')  % ADDED LINE
geoshow(states)
gridm off;

-Cam

Best Answer

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MATLAB: Issue creating a map of the USA

MATLAB: How to set usamap projection to mercator

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