6 Reprojecting geographic data 6 Reprojecting geographic data 6 Reprojecting geographic data 6 Reprojecting geographic data Prerequisites 6.1 Introduction 6.2 When to reproject? 6.3 Which CRS to use? 6.4 Reprojecting vector geometries 6.5 Modifying map projections 6.6 Reprojecting raster geometries 6.7 Exercises