Strange values of map axes limits (axesm).

I am building an app that will display various geographic data - vector (points, lines, polygons) and raster. Because of this I would like to plot the data on map axes which can be created using the axesm function. Let's say that all the data I would like to plot will have geographic coordinates (lat,lon). I have problems with understanding the limits (both horizontal and vertical) of the axes. What do the numbers mean?

Les't have a look at this simple example which plots a polyline in geographic coordinates on map axes.

s = geoshape([42 45],[10 15]);
a = axesm('mercator');
geoshow(a,s)

It produces a very simple plot, where the limits of the horizontal axis should be for sure somewhere between 40 and 50. However, when I try to get the limits of the horizontal axis I get strange values that are nowhere what I would expect (see the code below).

a.XLim                  % this gives me [0.16,0.28]
getm(a,'FLatLimits')    % this gives me [-86,86]

I need to know the limits of both the horizontal and the vertical axes in correct geographic coordinates due to resizing function in the app.

SIMPLE EXAMPLE:

Answer 1

[Jan Studnicka]

Hello,

The default setting for map axes is that the map frame is not visible. You need to toggle the visibility of the map frame by calling:

framem on

s = geoshape([42 45],[10 15]);
figure
a = axesm('mercator');
geoshow(a,s)
framem on

figure
s = geoshape([42 45],[10 15]);
a2 = axesm('mercator','MapLatLimit',[30 60],'MapLonLimit',[0 30]);
geoshow(a2,s)
framem on
mlabel on
plabel on
tightmap
gridm