This chapter provided steps and examples showing how to prepare raster data for further processing. This chapter covered common raster operations such as reclassification, resampling, rescaling, mosaicking, interpolation, and so on. Many of the tools shown in this chapter rely on GDAL to perform the calculations, while others are included as part of plugins or QGIS. Where applicable, alternative tools were noted in information boxes, as different tools may provide different functionality or parameters.

In the next chapter, we will switch from modifying and preparing existing data (as discussed in Chapter 4, Preparing Vector Data for Processing, and this chapter) to creating data. The next chapter will cover creating points from raw coordinate data, geocoding, georeferencing imagery, and topology operations.