In order to obtain a better image for visual analysis, we can combine different techniques to increase the image resolution. The first one changes the size of the image and recalculates the missing data by interpolation. The second one uses a band of higher resolution (band 8, in our case)—combined with bands in a lower resolution—to produce an improved true color map.
Image resizing or resampling is a technique to change the size of the image. By doing this we change the number of pixels in it (that is, the number of samples) or vice-versa.
As the size of an image is increased, we need to give a value to pixels that didn't exist before. This is done by interpolation; the new pixel value is given based on the value of its surrounding pixels. That's why we needed two-dimensional chunks.
In our first trial, we will resample one 30m-resolution band into a 15m-resolution image. Since we will perform a lot of tests, let's start by creating a practical...