Display Vector Data as Points and Lines

Display vector data on maps as points and lines.

This page shows how to create similar maps using map axes (since R2023a) and `axesm`-based maps. For a comparison of map axes and `axesm`-based maps, including when to use each type of display, see Choose a 2-D Map Display.

Prepare Data

Prepare data to use in the examples.

Load a MAT-file containing the coordinates of global coastlines into the workspace. The variables within the MAT-file, `coastlat` and `coastlon`, specify numeric latitude and longitude coordinates. Remove the South Pole by clipping the line data.

```load coastlines coast = geolineshape(coastlat,coastlon); coast = geoclip(coast,[-89 90],[-180 180]);```

Specify the locations of three cities (Cairo, Rio de Janeiro, and Perth).

```citylat = [30 -23 -32]; citylon = [32 -43 116];```

Find the coordinates of two tracks:

• A great circle track from Cairo to Rio de Janeiro

• A rhumb line track from Cairo to Perth

```[gclat,gclon] = track2("gc",citylat(1),citylon(1),citylat(2),citylon(2)); [rhlat,rhlon] = track2("rh",citylat(1),citylon(1),citylat(3),citylon(3));```

Create Map Using Map Axes

Display vector data on a map axes object as points and lines.

Set up a map that uses a Mollweide projection. Create the projected coordinate reference system (CRS) using the ESRI code `54009`.

```figure proj = projcrs(54009,Authority="ESRI"); mx = newmap(proj); hold on```

Display the global coastlines by using the `geoplot` function. Specify the line color as gray.

`geoplot(coast,Color=[0.4 0.4 0.4])`

Display the great circle track from Cairo to Rio de Janeiro using a thick line.

`geoplot(gclat,gclon,LineWidth=2)`

Display the rhumb line track from Cairo to Perth using a thick, dashed line.

`geoplot(rhlat,rhlon,"--",LineWidth=2)`

Display the locations of the cities by using the `geoscatter` function.

`geoscatter(citylat,citylon,"filled")`

Create Map Using `axesm`-Based Map

Display vector data on an `axesm`-based map as points and lines.

Set up a map that uses a Mollweide projection. Change the color of the frame to gray. Make the line width of the frame thinner.

```figure axesm mollweid framem("FEdgeColor",[0.4 0.4 0.4],"FLineWidth",0.5)```

Display the global coastlines by using the `plotm` function. Specify the line color as gray.

`plotm(coastlat,coastlon,"Color",[0.4 0.4 0.4])`

Display the great circle track from Cairo to Rio de Janeiro using a thick line.

`plotm(gclat,gclon,"LineWidth",2)`

Display the rhumb line track from Cairo to Perth using a thick, dashed line.

`plotm(rhlat,rhlon,"--","LineWidth",2)`

Display the locations of the cities by using the `scatterm` function.

`scatterm(citylat,citylon,"r","filled")`

Alternatively, you can plot geographic data over `axesm`-based maps by using the `geoshow` function.

Tips

To plot data that is already in projected coordinates, use a regular axes object and the `mapshow` function.