Mapping Toolbox

Terrain

A low resolution set of global elevation data is provided with MATLAB in the topo workspace. It is a regular matrix of average elevations and depths (in meters) for a constant grid spacing of one degree by one degree.

• load topo
  whos
  
  

  Name	Size	Bytes	Class
  topo	180x360	518400	double array
  topolegend	1x3	24	double array
  topomap1	64x3	1536	double array
  topomap2	128x3	3072	double array

Here it is displayed in an equal-area Eckert IV projection as a shaded-relief surface, which allows both large and small features to be seen:

• axesm eckert4; framem; gridm
  plotm(coast,'k'); zdatam(handlem('line'),max(topo(:)))
  meshm(topo,topolegend,size(topo),topo,'FaceColor','interp')
  demcmap('inc',topo,1000)
  camlight(0,80);; material([0.7 0.8 .4]); daspectm('m',300)
  hcb = colorbar('horiz')
  set(get(hcb,'XLabel'),'String','Topography in m.')
  
  
  

World Matrix Data

Geoid