Resampling

Resampling, a very common raster operation, changes raster dimensions (the number of rows an columns). Most often, it is used for making smaller images, however, it also can be used for increasing a raster (note that this does not improve its quality).

The goal of resampling (in case of downsampling) is to get approximately the same representation of a picture (in case of a color image) or value distribution (in case of a numeric raster).

Resampling Example

Here is a workspace that resamples a DEM model. The original sample is 25 by 25 pixels, which makes 625 pixels total.

After resampling to 10 by 10 pixels (now only 100 pixels), we have a good approximation of the original surface but expressed with a significantly smaller number of pixels. 3D visualization of the source and destination DEMs helps to better understand what is going on during resampling: