geoloc2grid - Convert geolocated data array to regular data grid
Syntax
[Z, refvec] = geoloc2grid(lat, lon,
A, cellsize)
Description
[Z, refvec] = geoloc2grid(lat, lon,
A, cellsize) converts the geolocated data array A,
given geolocation points in lat and lon,
to produce a regular data grid, Z, and the corresponding
three-element referencing vector refvec. cellsize is
a scalar that specifies the width and height of data cells in the
regular data grid, using the same angular units as lat and lon.
Data cells in Z falling outside the area covered
by A are set to NaN.
Remarks
geoloc2grid provides an easy-to-use alternative
to gridding geolocated data arrays with imbedm.
There is no need to preallocate the output map; there are no data
gaps in the output (even if cellsize is chosen
to be very small), and the output map is smoother.
Example
% Load the geolocated data array 'map1'
% and grid it to 1/2-degree cells.
load mapmtx
cellsize = 0.5;
[Z, refvec] = geoloc2grid(lt1, lg1, map1, cellsize);
% Create a figure
f = figure;
[cmap,clim] = demcmap(map1);
set(f,'Colormap',cmap,'Color','w')
% Define map limits
latlim = [-35 70];
lonlim = [0 100];
% Display 'map1' as a geolocated data array in subplot 1
subplot(1,2,1)
ax =
axesm('mercator','MapLatLimit',latlim,'MapLonLimit',lonlim,...
'Grid','on','MeridianLabel','on','ParallelLabel','on');
set(ax,'Visible','off')
geoshow(lt1, lg1, map1, 'DisplayType', 'texturemap');
% Display 'Z' as a regular data grid in subplot 2
subplot(1,2,2)
ax =
axesm('mercator','MapLatLimit',latlim,'MapLonLimit',lonlim,...
'Grid','on','MeridianLabel','on','ParallelLabel','on');
set(ax,'Visible','off')
geoshow(Z, refvec, 'DisplayType', 'texturemap');
 | geodetic2geocentricLat | | geoshow |  |
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