displaying elevation profile using geoshow problem

lat = [-20 -16] ;

lon = [174 180] ;

worldmap(latlim,lonlim);

load coastlines

geoshow(coastlat,coastlon,'DisplayType','texturemap')

hi, im trying to display elevation profile of lat,lon coordinates above using geoshow, however there is error in code im unsure how to properly use goeshow. Any help would be greatly appreciated

Answer 1

[VINAYAK LUHA]

Hi JJ,

I understand that you want to display the elevation profile of a geographical region defined by latitude and longitude ranges using the “geoshow” function.

Follow the below pointers to display the elevation profile using “geoshow” function-

1. Use the “topo” Digital Elevation Model (DEM) provided by the “MATLAB Mapping Toolbox” to obtain a gridded elevation dataset.
2. Obtain the “latitude” and “longitude” values using the “meshgrat” function.
3. Create an axesm-based map for world region using “worldmap” function.
4. Display map latitude and longitude data on the created axis using “geoshow” function.

Refer to the following code snippet to display the elevation profile using “geoshow” function:

load topo
load coastlines
colormap parula

[lat,lon] = meshgrat(topo,topolegend);

Warning: MESHGRAT will be removed in a future release. Use geographicGrid or NDGRID instead.

latlim = [-20 -16] ;
lonlim = [174 180] ; 
imagesc(flip(topo))

worldmap(latlim,lonlim);
geoshow(lat,lon,topo,'DisplayType','texturemap')
hold on
geoshow(coastlat,coastlon,'DisplayType','polygon')
colorbar

Refer to the following documentations for more details on the functions used in the code snippet:

meshgrat - https://in.mathworks.com/help/map/ref/meshgrat.html

geoshow - https://in.mathworks.com/help/map/ref/geoshow.html

worldmap - https://in.mathworks.com/help/map/ref/worldmap.html

Hope this helps in visualizing the elevation in a geographical region defined by a range of latitudes and longitudes.

Regards,

Vinayak Luha