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1. Introduction

An important layer for hydrologists and water managers is the flow direction. Using colours to style flow direction is possible, but the interpretation is difficult. More intuitive is to style the flow directions with arrows on a background map. This is possible by converting flow direction rasters to mesh format and using the mesh styling panel.

In this tutorial, you'll learn to:
  • Style a digital elevation model (DEM) with as a colour hillshade using blending.
  • Export a flow direction raster to GRIB mesh format.
  • Visualise the flow direction mesh with arrows.

Data for this tutorial can be downloaded from the main course page,