%See also: SNCTOOLS, NC_CF_GRID,...
%          NC_CF_STATIONTIMESERIES_TUTORIAL,...
%          NC_CF_GRID_WRITE_LAT_LON_ORTHOGONAL_TUTORIAL,
%          NC_CF_GRID_WRITE_LAT_LON_CURVILINEAR_TUTORIAL,
%          NC_CF_GRID_WRITE_X_Y_ORTHOGONAL_TUTORIAL
%          NC_CF_GRID_WRITE_X_Y_CURVILINEAR_TUTORIAL

The full grid is way too large too handle.

   D.url     = 'http://coast-enviro.er.usgs.gov/thredds/dodsC/bathy/smith_sandwell_v11';
nc_dump(D.url)

URL http://coast-enviro.er.usgs.gov/thredds/dodsC/bathy/smith_sandwell_v11 { 

dimensions:
lon = 21600 ;
lat = 17280 ;


variables:
// Preference 'PRESERVE_FVD':  false,
// dimensions consistent with ncBrowse, not with native MATLAB netcdf package.
single lon(lon), shape = [21600]
lon:long_name = "Uniformly spaced longitudes (-179.9917E - 179.9917E.01667E)" 
lon:units = "degrees_east" 
single lat(lat), shape = [17280]
lat:long_name = "Mercator spaced latitudes (80.738N - 80.738S)" 
...

   D.lon         = nc_varget (D.url,'lon'); % -180 ... 180
D.lat         = nc_varget (D.url,'lat'); %   90 ... -90

   OPT.lon       = [-4 10];
OPT.lat       = [48 58];

ind.lon       = find(D.lon > OPT.lon(1) & D.lon < OPT.lon(2) | D.lon > OPT.lon(1)+360 & D.lon < OPT.lon(2)+360)
ind.lat       = find(D.lat > OPT.lat(1) & D.lat < OPT.lat(2))

ind = 

lon: [840x1 double]


ind = 

lon: [840x1 double]
lat: [1003x1 double]

note: nc_varget is zero-based

   D.lon         = D.lon(ind.lon);
D.lat         = D.lat(ind.lat);
start         = [ind.lat(1)-1 ind.lon(1)-1]; % use -1 to get from 1-based Matlab to 0-based netCDF index !!
count         = [length(ind.lat) length(ind.lon)];
D.z           = nc_varget(D.url,'topo' ,start,count);
M.z.units     = nc_attget(D.url,'topo','units');
M.z.long_name = nc_attget(D.url,'topo','long_name');

   pcolorcorcen(D.lon,D.lat,D.z);
tickmap('ll')
grid on
axislat
caxis([-100 100])
colorbarwithvtext([M.z.long_name,' [',M.z.units,']'])
print('-dpng',['smith_sandwell_v11_lat_',nums2str(OPT.lat(:)'),'_lon_',nums2str(OPT.lon(:)')])