Import a sample projected raster and map cells reference object.

[Z,R] = readgeoraster('map_sample.tif');

Resize the raster using mapresize. Double the length and width of the raster by specifying the scale as 2. Use nearest neighbor interpolation by specifying the interpolation method as 'nearest'.

[Z2,R2] = mapresize(Z,R,2,'nearest');

Verify the raster has been resized by comparing the size of the original raster with the size of the updated raster.

R.RasterSize

ans = 1×2

     2     2

R2.RasterSize

ans = 1×2

     4     4

If the rasters are small, you can compare them directly.

Z

Z = 2×2

     1     2
     3     4

Z2

Z2 = 4×4

     1     1     2     2
     1     1     2     2
     3     3     4     4
     3     3     4     4

Read a projected raster data set and map cells reference object into the workspace.

[boston,R] = readgeoraster('boston.tif');

Display the raster with mapshow.

mapshow(boston,R)

Resize the projected raster data set. For this example, reduce the raster to one sixteenth of the original size.

[resizedBoston,resizedR] = mapresize(boston,R,1/16);

Display the resized raster. Note that mapshow preserves the original limits of the map in the display so that, at first glance, the resized raster appears to be the same size as the original. A closer look reveals that the size of pixels in the resized raster are larger than the pixels in the original.

figure
mapshow(resizedBoston,resizedR)