demresize documentation

demresize works like imresize, but also resizes corresponding map coordinates.

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Contents

Syntax

[Zr,xr,yr] = demresize(Z,x,y,sc)
[Zr,xr,yr] = demresize(...,'method')
[Zr,xr,yr] = demresize(...,'Name',Value,...)

Description

[Zr,xr,yr] = demresize(Z,x,y,sc) resizes Z using imresize, and corresponding vector or 2D grid coordinates x and y to a scalar scale sc.

[Zr,xr,yr] = demresize(...,'method') specifies an interpolation method. Default is 'bicubic'.

[Zr,xr,yr] = demresize(...,'Name',Value,...) specifies any input name-value pairs accepted by imresize.

Example:

Consider this 20x20 grid:

[X,Y,Z] = peaks(20);
X = X+10; % (for clear distinction from y)

figure
imagescn(X,Y,Z)

These black dots mark the center points of each pixel in the 20x20 grid:

hold on
plot(X,Y,'k.')

Let's suppose you want to resize the grid to 1/3 of its original grid resolution. Here's how you would do that:

[Zr,Xr,Yr] = demresize(Z,X,Y,1/3);

% Plot as scatter circles with black edge markers:
scatter(Xr(:),Yr(:),100,Zr(:),'filled','markeredgecolor','k')

Or if you prefer to see the new grid as its own imagescn plot:

figure
imagescn(Xr,Yr,Zr)

Author Info

This function is part of the Climate Data Toolbox for Matlab. The function and supporting documentation were written by Chad A. Greene of NASA's Jet Propulsion Laboratory.