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Mastering QGIS by GISP Dr. John Van Hoesen, GISP Dr. Richard Smith Jr., GISP Kurt Menke, Dr. Luigi Pirelli

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Chapter 5. Preparing Raster Data for Processing

This chapter covers how to prepare raster data for further processing with the GDAL menu tools and Processing Toolbox algorithms. There are specific considerations and tools for managing raster data. The topics that you will cover in this chapter are as follows:

  • Reclassification
  • Resampling
  • Rescaling
  • Raster mosaics
  • Generating overviews (pyramids)
  • Data format conversions
  • Interpolation

Reclassifying rasters

Raster data sets often have hundreds or thousands of values. For an analysis, you may need to synthesize the data into meaningful categories. For example, elevation may be an important input in a habitat model for species X. However, you may only be interested in identifying several broad elevation thresholds ...

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